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RoHS lead-free solder and lead-solder-exempted products are
available
Delivers up to 15A (50W)
Industry-standard quarter-brick pinout
Outputs available in 12.0, 8.0, 6.0, 5.0, 3.3, 2.5, 2.0, 1.8, 1.5, 1.2,
and 1.0 V
Available in through-hole and SMT packages
Low profile: 0.258” (6.55 mm)
Low weight: 0.53 oz (15 g)
On-board input differential LC-filter
Startup into pre-biased output
No minimum load required
Meets Basic Insulation requirements
Withstands 100 V input transient for 100 ms
Fixed-frequency operation
Fully protected
Remote output sense
Positive or negative logic ON/OFF option
Output voltage trim range: +10%/−20% with industry-standard
trim equations (except 1.2 V and 1.0 V outputs with trim range
± 10%)
Output voltage trim range: +10%/−20% with industry-standard
trim equations (except 1.2 V and 1.0 V outputs with trim range
± 10%)
Safety according to IEC/EN 60950-1 2nd Edition and UL/CSA
60950-1 2ndEdition
Designed to meet Class B conducted emissions per FCC and
EN55022 when used with external filter
All materials meet UL94, V-0 flammability rating
The SemiQ™ Series of dc-dc converters provides a high-
efficiency single output in a size that is only 60% of industry-
standard quarter-bricks, while preserving the same pinout and
functionality.
In high temperature environments, for output voltages ranging
from 3.3 V to 1.0 V, the thermal performance of SemiQ™
converters exceeds that of most competitors' 20-25 A quarter-
bricks. This performance is accomplished through the use of
patent-pending circuit, packaging, and processing techniques to
achieve ultra-high efficiency, excellent thermal management, and
a very low body profile.
Low body profile and the preclusion of heat sinks minimize
airflow shadowing, thus enhancing cooling for downstream
devices. The use of 100% automation for assembly, coupled with
advanced electronic circuits and thermal design, results in a
product with extremely high reliability.
Operating from a 36-75 V input, the SQ48 Series converters
provide any standard output voltage from 12 V down to 1.0 V.
Outputs can be trimmed from –20% to +10% of the nominal
output voltage (± 10% for output voltages 1.2 V and 1.0 V), thus
providing outstanding design flexibility.
With a standard pinout and trim equations, the SQ48 Series
converters are perfect drop-in replacements for existing quarter-
brick designs. Inclusion of this converter in new designs can
result in significant board space and cost savings. In both cases
the designer can expect reliability improvement over other
available converters because of the SQ48 Series’ optimized
thermal efficiency.
Telecommunications
Data Communications
Wireless Communications
Servers
High efficiency – no heat sink required
For output voltages ranging from 3.3 to 1.0 V, 40% higher
current capability at elevated temperatures than most
competitors' 20-25A quarter-bricks
Extremely small footprint: 0.896” x 2.30” (2.06 in2 ), 40%
smaller than conventional quarter-bricks
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Conditions: TA = 25 º C, Airflow = 300 LFM (1.5 m/s), Vin = 48 VDC, Cin=33 µ F, unless otherwise specified.
PARAMETER
Notes
MIN
TYP
MAX
UNITS
Absolute Maximum Ratings
Input Voltage
Continuous
0
80
VDC
Operating Ambient Temperature
-40
85
°C
Storage Temperature
-55
125
°C
Input Characteristics
Operating Input Voltage Range
36
48
75
VDC
Input Undervoltage Lockout
Non-latching
Turn-on Threshold
33
34
35
VDC
Turn-off Threshold
31
32
33
VDC
Input Voltage Transient
100 ms
100
VDC
Isolation Characteristics
I/O Isolation
2000
VDC
Isolation Capacitance
1.0 - 3.3 V
160
pF
5.0 - 6.0 V
260
pF
8.0 - 12 V
230
pF
Isolation Resistance
10
MΩ
Feature Characteristics
Switching Frequency
415
kHz
Output Voltage Trim Range1
Industry-std. equations (1.5 - 12V)
-20
+10
%
Use trim equation on Page 4 (1.0 -1.2 V)
-10
+10
%
Remote Sense Compensation1
Percent of VOUT(NOM)
+10
%
Output Overvoltage Protection
Non-latching ( 1.5 – 12 V)
117
122
127
%
Non-latching (1.0 -1.2 V)
124
132
140
%
Auto-Restart Period
Applies to all protection features
100
ms
Turn-On Time
See Figures F, G and H
4
ms
ON/OFF Control (Positive Logic)
Converter Off (logic low)
-20
0.8
VDC
Converter On (logic high)
2.4
20
VDC
ON/OFF Control (Negative Logic)
Converter Off (logic high)
2.4
20
VDC
Converter On (logic low)
-20
0.8
VDC
Additional Notes:
1Vout can be increased up to 10% via the sense leads or up to 10% via the trim function. However, the total output voltage trim from all sources
should not exceed 10% of VOUT (NOM), in order to ensure specified operation of overvoltage protection circuitry.
These power converters have been designed to be stable with no external capacitors when used in low inductance input
and output circuits.
In many applications, the inductance associated with the distribution from the power source to the input of the converter
can affect the stability of the converter. The addition of a 33 μF electrolytic capacitor with an ESR < 1 Ω across the input
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helps to ensure stability of the converter. In many applications, the user has to use decoupling capacitance at the load. The
power converter will exhibit stable operation with external load capacitance up to 1000 μF on 12 V, 2,200 μF on 8.0 V,
10,000 μF on 5.0 – 6.0 V, and 15,000 μF on 3.3 – 1.0 V outputs.
Additionally, see the EMC section of this data sheet for discussion of other external components which may be required for
control of conducted emissions.
The ON/OFF pin is used to turn the power converter on or off remotely via a system signal. There are two remote control
options available, positive logic and negative logic, with both referenced to Vin(-). A typical connection is shown in Fig. A.
Fig. A: Circuit configuration for ON/OFF function
The positive logic version turns on when the ON/OFF pin is at a logic high and turns off when at a logic low. The converter
is on when the ON/OFF pin is left open. See Electrical Specifications for logic high/low definitions.
The negative logic version turns on when the pin is at a logic low and turns off when the pin is at a logic high. The ON/OFF
pin can be hardwired directly to Vin(-) to enable automatic power up of the converter without the need of an external control
signal.
The ON/OFF pin is internally pulled up to 5V through a resistor. A properly debounced mechanical switch, open collector
transistor, or FET can be used to drive the input of the ON/OFF pin. The device must be capable of sinking up to 0.2 mA at
a low level voltage of ≤ 0.8 V. An external voltage source (± 20 V maximum) may be connected directly to the ON/OFF input,
in which case it must be capable of sourcing or sinking up to 1 mA depending on the signal polarity. See the Startup
Information section for system timing waveforms associated with use of the ON/OFF pin.
The remote sense feature of the converter compensates for voltage drops occurring between the output pins of the
converter and the load. The SENSE(-) (Pin 5) and SENSE(+) (Pin 7) pins should be connected at the load or at the point
where regulation is required (see Fig. B).
Fig. B: Remote sense circuit configuration
CAUTION
If remote sensing is not utilized, the SENSE(-) pin must be connected to the Vout(-) pin (Pin 4), and the SENSE(+) pin must
be connected to the Vout(+) pin (Pin 8) to ensure the converter will regulate at the specified output voltage. If these
connections are not made, the converter will deliver an output voltage that is slightly higher than the specified data sheet
value.
Because the sense leads carry minimal current, large traces on the end-user board are not required. However, sense traces
should be run side by side and located close to a ground plane to minimize system noise and ensure optimum
performance.
When using the remote sense function, the converter’s output overvoltage protection (OVP) senses the voltage across
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Vout(+) and Vout(-), and not across the sense lines, so the resistance (and resulting voltage drop) between the output pins
of the converter and the load should be minimized to prevent unwanted triggering of the OVP.
When utilizing the remote sense feature, care must be taken not to exceed the maximum allowable output power capability
of the converter, which is equal to the product of the nominal output voltage and the allowable output current for the given
conditions.
When using remote sense, the output voltage at the converter can be increased by as much as 10% above the nominal
rating in order to maintain the required voltage across the load. Therefore, the designer must, if necessary, decrease the
maximum current (originally obtained from the derating curves) by the same percentage to ensure the converter’s actual
output power remains at or below the maximum allowable output power.
The output voltage can be adjusted up 10% or down 20% for Vout ≥ 1.5 V, and 10% for Vout = 1.2 V relative to the rated
output voltage by the addition of an externally connected resistor. For output voltage 3.3 V, trim up to 10% is guaranteed
only at Vin ≥ 40 V, and it is marginal (8% to 10%) at Vin = 36 V.
The TRIM pin should be left open if trimming is not being used. To minimize noise pickup, a 0.1 μF capacitor is connected
internally between the TRIM and SENSE(-) pins.
To increase the output voltage, refer to Fig. C. A trim resistor, RT-INCR, should be connected between the TRIM (Pin 6) and
SENSE(+) (Pin 7), with a value of:
10.22
1.225Δ
626Δ)V5.11(100
RNOMO
INCRT
[k],
for 1.5 – 12 V.
[kΩ] (1.2 V)
[kΩ] (1.0 V)
where,
INCRTR
Required value of trim-up resistor k]
NOMOV
Nominal value of output voltage [V]
100X
V)V(V
Δ NOM- O
NOM-OREQ-O
[%]
REQOV
Desired (trimmed) output voltage [V].
Fig. C: Configuration for increasing output voltage
When trimming up, care must be taken not to exceed the converter‘s maximum allowable output power. See the previous
section for a complete discussion of this requirement.
To decrease the output voltage (Fig. D), a trim resistor, RT-DECR, should be connected between the TRIM (Pin 6) and
SENSE(-) (Pin 5), with a value of:
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where,
DECRTR
Required value of trim-down resistor [kΩ] and
Δ
is defined above.
Note:
The above equations for calculation of trim resistor values match those typically used in conventional industry-standard quarter-bricks and one-
eighth bricks (except for 1.2 V and 1.0 V outputs).
Converters with output voltages 1.2 V and 1.0 V are available with alternative trim feature to provide the customers with the
flexibility of second sourcing. These converters have a “T” character in the part number. The trim equations of “T” version
of converters and more information can be found in Application Note 103.
Fig. D: Configuration for decreasing output voltage
Trimming/sensing beyond 110% of the rated output voltage is not an acceptable design practice, as this condition could
cause unwanted triggering of the output overvoltage protection (OVP) circuit. The designer should ensure that the
difference between the voltages across the converter’s output pins and its sense pins does not exceed 10% of VOUT(NOM),
or:
X NOM-O SENSESENSEOUTOUT 10%V)](V)([V)](V)([V
[V]
This equation is applicable for any condition of output sensing and/or output trim.
Input undervoltage lockout is standard with this converter. The converter will shut down when the input voltage drops
below a pre-determined voltage.
The input voltage must be typically 34 V for the converter to turn on. Once the converter has been turned on, it will shut off
when the input voltage drops typically below 32 V. This feature is beneficial in preventing deep discharging of batteries
used in telecom applications.
The converter is protected against overcurrent or short circuit conditions. Upon sensing an overcurrent condition, the
converter will switch to constant current operation and thereby begin to reduce output voltage. When the output voltage
drops below 50% of the nominal value of output voltage, the converter will shut down (Fig. x.17).
Once the converter has shut down, it will attempt to restart nominally every 100 ms with a typical 1-2% duty cycle (Fig.
x.18). The attempted restart will continue indefinitely until the overload or short circuit conditions are removed or the output
voltage rises above 50% of its nominal value.
Once the output current is brought back into its specified range, the converter automatically exits the hiccup mode and
continues normal operation.
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The converter will shut down if the output voltage across Vout(+) (Pin 8) and Vout(-) (Pin 4) exceeds the threshold of the
OVP circuitry. The OVP circuitry contains its own reference, independent of the output voltage regulation loop. Once the
converter has shut down, it will attempt to restart every 100 ms until the OVP condition is removed.
The converter will shut down under an overtemperature condition to protect itself from overheating caused by operation
outside the thermal derating curves, or operation in abnormal conditions such as system fan failure. After the converter has
cooled to a safe operating temperature, it will automatically restart.
The converters meet North American and International safety regulatory requirements. Basic Insulation is provided between
input and output.
To comply with safety agencies’ requirements, an input line fuse must be used external to the converter. The Table below
provides the recommended fuse rating for use with this family of products.
Output Voltage
Fuse Rating
3.3 V
4 A
12 – 5.0 V, 2.5 V
3 A
2.0 – 1.2 V
2 A
All SQ converters are UL approved for a maximum fuse rating of 15 Amps. To protect a group of converters with a single
fuse, the rating can be increased from the recommended values above.
EMC requirements must be met at the end-product system level, as no specific standards dedicated to EMC
characteristics of board mounted component dc-dc converters exist. However, Bel Power Solutions tests its converters to
several system level standards, primary of which is the more stringent EN55022,
Information technology equipment - Radio
disturbance characteristics - Limits and methods of measurement.
An effective internal LC differential filter significantly reduces input reflected ripple current, and improves EMC.
With the addition of a simple external filter (see Application Note 100), all versions of the SQ48 Series converters pass the
requirements of Class B conducted emissions per EN55022 and FCC requirements. Please contact Bel Power Solutions
Applications Engineering for details of this testing.
The converter has been characterized for many operational aspects, to include thermal derating (maximum load current as
a function of ambient temperature and airflow) for vertical and horizontal mounting, efficiency, startup and shutdown
parameters, output ripple and noise, transient response to load step-change, overload, and short circuit.
The figures are numbered as Fig. x.y, where x indicates the different output voltages, and y associates with specific plots (y
= 1 for the vertical thermal derating, …). For example, Fig. x.1 will refer to the vertical thermal derating for all the output
voltages in general.
The following pages contain specific plots or waveforms associated with the converter. Additional comments for specific
data are provided below.
All data presented were taken with the converter soldered to a test board, specifically a 0.060” thick printed wiring board
(PWB) with four layers. The top and bottom layers were not metalized. The two inner layers, comprised of two-ounce
copper, were used to provide traces for connectivity to the converter.
The lack of metalization on the outer layers as well as the limited thermal connection ensured that heat transfer from the
converter to the PWB was minimized. This provides a worst-case but consistent scenario for thermal derating purposes.
All measurements requiring airflow were made in the vertical and horizontal wind tunnel using Infrared (IR) thermography
and thermocouples for thermometry.
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Ensuring components on the converter do not exceed their ratings is important to maintaining high reliability. If one
anticipates operating the converter at or close to the maximum loads specified in the derating curves, it is prudent to check
actual operating temperatures in the application. Thermographic imaging is preferable; if this capability is not available, then
thermocouples may be used. The use of AWG #40 gauge thermocouples is recommended to ensure measurement
accuracy. Careful routing of the thermocouple leads will further minimize measurement error. Refer to Fig. E for the
optimum measuring thermocouple location.
Fig. E: Location of the thermocouple for thermal testing
Load current vs. ambient temperature and airflow rates are given in Fig. x.1 to Fig. x.4 for through-hole and surface-mount
versions. Ambient temperature was varied between 25° C and 85° C, with airflow rates from 30 to 500LFM (0.15 to 2.5m/s),
and vertical and horizontal converter mounting.
For each set of conditions, the maximum load current was defined as the lowest of:
(i) The output current at which any FET junction temperature does not exceed a maximum specified temperature (120° C) as
indicated by the thermographic image, or
(ii) The nominal rating of the converter (4A on 12V, 5.3A on 8.0V, 8A on 6.0V, 10A on 5.0V, and 15A on 3.3 – 1.0V).
During normal operation, derating curves with maximum FET temperature less or equal to 120 ° C should not be exceeded.
Temperature on the PCB at thermocouple location shown in Fig. E should not exceed 118 ° C in order to operate inside the
derating curves.
Fig. x.5 shows the efficiency vs. load current plot for ambient temperature of 25ºC, airflow rate of 300 LFM (1.5 m/s) with
vertical mounting and input voltages of 36V, 48V and 72V. Also, a plot of efficiency vs. load current, as a function of
ambient temperature with Vin = 48V, airflow rate of 200 LFM (1 m/s) with vertical mounting is shown in Fig. x.6.
Fig. x.7 shows the power dissipation vs. load current plot for Ta = 25ºC, airflow rate of 300LFM (1.5 m/s) with vertical
mounting and input voltages of 36V, 48V and 72V. Also, a plot of power dissipation vs. load current, as a function of
ambient temperature with Vin = 48V, airflow rate of 200LFM (1 m/s) with vertical mounting is shown in Fig. x.8.
Output voltage waveforms, during the turn-on transient using the ON/OFF pin for full rated load currents (resistive load) are
shown without and with external load capacitance in Fig. x.9 and Fig. x.10, respectively.
Fig. x.13 shows the output voltage ripple waveform, measured at full rated load current with a 10 μF tantalum and 1 μF
ceramic capacitor across the output. Note that all output voltage waveforms are measured across a 1 μF ceramic
capacitor.
The input reflected ripple current waveforms are obtained using the test setup shown in Fig x.14. The corresponding
waveforms are shown in Fig. x.15 and Fig. x.16.
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Fig. F: Startup scenario #1
Scenario #1: Initial Startup From Bulk Supply
ON/OFF function enabled, converter started via application of VIN.
See Figure F.
Time
Comments
t0
ON/OFF pin is ON; system front-end power is toggled
on, VIN to converter begins to rise.
t1
VIN crosses undervoltage Lockout protection circuit
threshold; converter enabled.
t2
Converter begins to respond to turn-on command
(converter turn-on delay).
t3
Converter VOUT reaches 100% of nominal value.
For this example, the total converter startup time (t3- t1) is typically
4 ms.
Fig. G: Startup scenario #2.
Scenario #2: Initial Startup Using ON/OFF Pin
With VIN previously powered, converter started via ON/OFF pin.
See Figure G.
Time
Comments
t0
VINPUT at nominal value.
t1
Arbitrary time when ON/OFF pin is enabled (converter
enabled).
t2
End of converter turn-on delay.
t3
Converter VOUT reaches 100% of nominal value.
For this example, the total converter startup time (t3- t1) is typically
4 ms.
Fig. H: Startup scenario #3.
Scenario #3: Turn-off and Restart Using ON/OFF Pin
With VIN previously powered, converter is disabled and then
enabled via ON/OFF pin. See Figure H.
Time
Comments
t0
VIN and VOUT are at nominal values; ON/OFF pin ON.
t1
ON/OFF pin arbitrarily disabled; converter output falls
to zero; turn-on inhibit delay period (100 ms typical) is
initiated, and ON/OFF pin action is internally inhibited.
t2
ON/OFF pin is externally re-enabled.
If (t2- t1) ≤ 100 ms, external action of ON/OFF pin
is locked out by startup inhibit timer.
If (t2- t1) > 100 ms, ON/OFF pin action is internally
enabled.
t3
Turn-on inhibit delay period ends. If ON/OFF pin is
ON, converter begins turn-on; if off, converter awaits
ON/OFF pin ON signal; see Figure G.
t4
End of converter turn-on delay.
t5
Converter VOUT reaches 100% of nominal value.
For the condition, (t2- t1) ≤ 100 ms, the total converter startup time
(t5- t2) is typically 104 ms. For (t2- t1) > 100 ms, startup will be
typically 4 ms after release of ON/OFF pin.
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Conditions: T A
= 25 º C, Airflow = 300 LFM (1.5 m/s), Vin = 48 VDC, Vout = 12 VDC, unless otherwise specified.
Parameter
Notes
Min
Typ
Max
Units
Input Characteristics
Maximum Input Current
4 ADC, 12 VDC Out @ 36 VDC In
1.53
ADC
Input Stand-by Current
Vin = 48V, converter disabled
3
mADC
Input No Load Current (0 load on
the output)
Vin = 48V, converter enabled
45
mADC
Input Reflected-Ripple Current
25MHz bandwidth
6
mAPK-
PK
Input Voltage Ripple Rejection
120HZ
TBD
dB
Output Characteristics
Output Voltage Set Point (no load)
11.880
12.000
12.120
VDC
Output Regulation
Over Line
±4
±5
mV
Over Load
±4
±5
mV
Output Voltage Range
Over line, load and temperature1
11.820
12.180
VDC
Output Ripple and Noise - 25 MHz
bandwidth
Full load + 10 μF tantalum + 1 Μf ceramic
80
120
mVPK-
PK
External Load Capacitance
Plus full load (resistive)
1,000
μF
Output Current Range
0
4
ADC
Current Limit Inception
Non-latching
4.5
5
5.5
ADC
Peak Short-Circuit Current
Non-latching, Short =10 mΩ.
7.5
10
A
RMS Short-Circuit Current
Non-latching
4
Arms
Dynamic Response
Load Change 25% of Iout Max,
di/dt = 0.1 A/μs
Co = 1 μF ceramic
200
mV
di/dt = 5 A/μs
Co = 47 μF tantalum + 1 μF ceramic
200
mV
Settling Time to 1%
400
μs
Efficiency
100% Load
87.0
%
50% Load
87.0
%
1-40 ºC to 85 ºC.
Fig. 12V.1: Available load current vs. ambient air Fig. 12V.2: Available load current vs. ambient air
temperature and airflow rates for SQ48T04120 converter temperature and airflow rates for SQ48T04120 converter
with D height pins mounted vertically with Vin = 48V, air with D height pins mounted horizontally with Vin = 48V, air
flowing from pin 3 to pin 1, and maximum FET flowing from pin 3 to pin 1, and maximum FET
temperature ≤ 120° C. temperature ≤ 120°C.
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Fig. 12V.3: Available load current vs. ambient air Fig. 12V.4: Available load current vs. ambient air
temperature and airflow rates for SQ48S04120 converter temperature and airflow rates for SQ48S04120 conve
mounted vertically with Vin = 48V, air flowing from pin 3 mounted horizontally with Vin = 48V, air flowing from pin
to pin 1, and maximum FET temperature ≤ 120°C. 3 to pin 1, and maximum FET temperature ≤ 120
Fig. 12V.5: Efficiency vs. load current and input voltage for Fig. 12V.6: Efficiency vs. load current and ambient
SQ48T/S04120 converter mounted vertically with air temperature for SQ48T/S04120 converter mounted
flowing from pin 3 to pin 1 at a rate of 300LFM (1.5 m/s) vertically with Vin = 48V and air flowing from pin 3 to pin
and Ta = 25°C. 1 at a rate of 200LFM (1.0 m/s).
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Fig. 12V.7: Power dissipation vs. load current and Fig. 12V.8: Power dissipation vs. load current and
input voltage for SQ48T/S04120 converter mounted ambient temperature for SQ48T/S04120 converter
vertically with air flowing from pin 3 to pin 1 at a rate of mounted vertically with Vin = 48V and air flowing from
300 LFM (1.5 m/s) and Ta = 25° C. pin 3 to pin 1 at a rate of 200LFM (1.0m/s).
Fig. 12V.9: Turn-on transient at full rated load current Fig. 12V.10: Turn-on transient at full rated load current
(resistive) with no output capacitor at Vin = 48V, (resistive) plus 1,000 μF at Vin = 48V, triggered via
triggered via ON/OFF pin. Top trace: ON/OFF signal ON/OFF pin. Top trace: ON/OFF signal (5V/div.).
(5V/div.). Bottom trace: output voltage (5V/div.). Time Bottom trace: output voltage (5V/div.). Time scale:
scale: 1ms/div. 2ms/div.
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Fig. 12V.11: Output voltage response to load current Fig. 12V.12: Output voltage response to load current
step-change (1A – 2A – 1A) at Vin = 48V. Top trace: step-change (1A – 2A – 1A) at Vin = 48V. Top trace:
output voltage (200mV/div.). Bottom trace: load current output voltage (200 mV/div.). Bottom trace: load current
(1A/div.). Current slew rate: 0.1A/μs. Co = 1μF ceramic. (1A/div.). Current slew rate: 5 A/μs. Co = 47μF tantalum
Time scale: 0.5 ms/div. + 1μF ceramic. Time scale: 0.5 ms/div.
Fig. 12V.13: Output voltage ripple (50 mV/div.) at full Fig. 12V.14: Test Setup for measuring input reflec
rated load current into a resistive load with Co = 10μF ripple currents, ic and is
tantalum + 1 μF ceramic and Vin = 48V. Time scale: 1μs/div.
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Fig. 12V.15: Input reflected ripple current, ic Fig. 12V.16: Input reflected ripple current, is
(100 mA/div.), measured at input terminals at full rated (100 mA/div.), measured at input terminals at full rated
load current and Vin = 48V. Refer to Fig. 12V.14 for test full rated load current and Vin = 48V. Refer to
setup. Time scale: 1μs/div. Fig. 12V.14 for test setup. Time scale: 1μs/div.
Fig. 12V.17: Output voltage vs. load current showing Fig. 12V.18: Load current (top trace, 5A/div.,
current limit point and converter shutdown point. Input 20 ms/div.) into a 10 mΩ short circuit during restart, at
voltage has almost no effect on current limit Vin = 48V. Bottom trace (5A/div., 1ms/div.) is an
characteristic. expansion of the on-time portion of the top trace.
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BCD.00637_AA
Conditions: T A
= 25 º C, Airflow = 300 LFM (1.5 m/s), Vin = 48 VDC, Vout = 8.0 VDC, unless otherwise specified.
Parameter
Notes
Min
Typ
Max
Units
Input Characteristics
Maximum Input Current
5.3 ADC, 8.0 VDC Out @ 36 VDC In
1.38
ADC
Input Stand-by Current
Vin = 48V, converter disabled
3
mADC
Input No Load Current (0 load on
the output)
Vin = 48V, converter enabled
33
mADC
Input Reflected-Ripple Current
25MHz bandwidth
6
mAPK-
PK
Input Voltage Ripple Rejection
120HZ
TBD
dB
Output Characteristics
Output Voltage Set Point (no load)
7.920
8.000
8.080
VDC
Output Regulation
Over Line
±4
± 10
mV
Over Load
±4
± 10
mV
Output Voltage Range
Over line, load and temperature1
7.880
8.120
VDC
Output Ripple and Noise - 25 MHz
bandwidth
Full load + 10 μF tantalum + 1 μF ceramic
70
100
mVPK-
PK
External Load Capacitance
Plus full load (resistive)
2,200
μF
Output Current Range
0
5.3
ADC
Current Limit Inception
Non-latching
5.75
6.25
6.75
ADC
Peak Short-Circuit Current
Non-latching, Short =10 mΩ.
10
12
A
RMS Short-Circuit Current
Non-latching
4
Arms
Dynamic Response
Load Change 25% of Iout Max,
di/dt = 0.1 A/μs
Co = 1 μF ceramic
160
mV
di/dt = 5 A/μs
Co = 94 μF tantalum + 1 μF ceramic
160
mV
Settling Time to 1%
400
μs
Efficiency
100% Load
85.5
%
50% Load
87.0
%
1-40 ºC to 85 ºC.
Fig. 8.0V.1: Available load current vs. ambient air Fig. 8.0V.2: Available load current vs. ambient air
temperature and airflow rates for SQ48T05080 converter temperature and airflow rates for SQ48T05080 converter
with D height pins mounted vertically with Vin = 48 V, air with D height pins mounted horizontally with Vin = 48 V,
flowing from pin 3 to pin 1, and maximum FET air flowing from pin 3 to pin 1, and maximum FET
temperature ≤ 120°C. temperature ≤ 120°C.
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BCD.00637_AA
Fig. 8.0V.3: Available load current vs. ambient air Fig. 8.0V.4: Available load current vs. ambient ai
temperature and airflow rates for SQ48S05080 converter temperature and airflow rates for SQ48S05080 converter
mounted vertically with Vin = 48V, air flowing from pin 3 mounted horizontally with Vin = 48V, air flowing from pin
to pin 1, and maximum FET temperature ≤ 120°C. 3 to pin 1, and maximum FET temperature ≤ 120°C.
Fig. 8.0V.5: Efficiency vs. load current and input voltage Fig. 8.0V.6: Efficiency vs. load current and ambient
or SQ48T/S05080 converter mounted vertically with air temperature for SQ48T/S05080 converter mounted
flowing from pin 3 to pin 1 at a rate of 300 LFM (1.5 m/s) vertically with Vin = 4V and air flowing from pin 3 to pin 1
and Ta = 25°C. at a rate of 200 LFM (1.0m/s).
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BCD.00637_AA
Fig. 8.0V.7: Power dissipation vs. load current and Fig. 8.0V.8: Power dissipation vs. load current and
input voltage for SQ48T/S05080 converter mounted ambient temperature for SQ48T/S05080 converter
vertically with air flowing from pin 3 to pin 1 at a rate of mounted vertically with Vin = 48V and air flowing from
300 LFM (1.5 m/s) and Ta = 25° C. pin 3 to pin 1 at a rate of 200 LFM (1.0 m/s).
Fig. 8.0V.9: Turn-on transient at full rated load current Fig. 8.0V.10: Turn-on transient at full rated load
(resistive) with no output capacitor at Vin = 48V, current (resistive) plus 2,200 μF at Vin = 48V,
triggered via ON/OFF pin. Top trace: ON/OFF signal triggered via ON/OFF pin. Top trace: ON/OFF signal
(5 V/div.). Bottom trace: output voltage (2 V/div.). Time (5 V/div.). Bottom trace: output voltage (2 V/div.). Time
scale: 1 ms/div. scale: 2 ms/div.
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BCD.00637_AA
Fig. 8.0V.11: Output voltage response to load current Fig. 8.0V.12: Output voltage response to load current
step-change (1.325A – 2.65A – 1.325A) at Vin = 48V. step-change (1.325A – 2.65A – 1.325A) at Vin = 48V.
Top trace: output voltage (200 mV/div.). Bottom trace: Top trace: output voltage (200 mV/div.). Bottom trace:
load current (1 A/div.). Current slew rate: 0.1 A/μs. load current (1 A/div.). Current slew rate: 5 A/μs.
Co = 1 μF ceramic. Time scale: 0.5 ms/div. Co = 94μF tantalum + 1μF ceramic. Time scale:
0.5 ms/div.
Fig. 8.0V.13: Output voltage ripple (50 mV/div.) at full Fig. 8.0V.14: Test Setup for measuring input reflected
rated load current into a resistive load with Co = 10 μF ripple currents, ic and is
tantalum + 1μF ceramic and Vin = 48V. Time scale: 1μs/div.
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BCD.00637_AA
Fig. 8.0V.15: Input reflected ripple current, ic Fig. 8.0V.16: Input reflected ripple current, is
(100 mA/div.), measured at input terminals at full rated (10 mA/div.), measured through 10μH at the source at
load current and Vin = 48V. Refer to Fig. 8.0V.14 for test full rated load current and Vin = 48V. Refer to
setup. Time scale: 1μs/div. Fig. 8.0V.14 for test setup. Time scale: 1μs/div.
Fig. 8.0V.17: Output voltage vs. load current showing Fig. 8.0V.18: Load current (top trace, 5A/div.,
current limit point and converter shutdown point. Input 20 ms/div.) into a 10 mΩ short circuit during restart, at
voltage has almost no effect on current limit Vin = 48V. Bottom trace (5 A/div., 1 ms/div.) is an
characteristic. expansion of the on-time portion of the top trace.
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BCD.00637_AA
C
onditions: T A
= 25 º C, Airflow = 300 LFM (1.5 m/s), Vin = 48 VDC, Vout = 6.0 VDC, unless otherwise specified.
Parameter
Notes
Min
Typ
Max
Units
Input Characteristics
Maximum Input Current
8 ADC, 6.0 VDC Out @ 36 VDC In
1.5
ADC
Input Stand-by Current
Vin = 48V, converter disabled
3
mADC
Input No Load Current (0 load on
the output)
Vin = 48V, converter enabled
45
mADC
Input Reflected-Ripple Current
25MHz bandwidth
6
mAPK-
PK
Input Voltage Ripple Rejection
120HZ
TBD
dB
Output Characteristics
Output Voltage Set Point (no load)
5.940
6.000
6.060
VDC
Output Regulation
Over Line
±2
± 10
mV
Over Load
±2
± 10
mV
Output Voltage Range
Over line, load and temperature1
5.910
6.090
VDC
Output Ripple and Noise - 25 MHz
bandwidth
Full load + 10 μF tantalum + 1 μF ceramic
45
60
mVPK-
PK
External Load Capacitance
Plus full load (resistive)
10,000
μF
Output Current Range
0
8
ADC
Current Limit Inception
Non-latching
8.4
10
11.5
ADC
Peak Short-Circuit Current
Non-latching, Short =10 mΩ.
15
25
A
RMS Short-Circuit Current
Non-latching
5.3
Arms
Dynamic Response
Load Change 25% of Iout Max,
di/dt = 0.1 A/μs
Co = 1 μF ceramic
160
mV
di/dt = 5 A/μs
Co = 450© μF tantalum + 1 μF ceramic
80
mV
Settling Time to 1%
200
μs
Efficiency
100% Load
89.0
%
50% Load
89.0
%
1-40 ºC to 85 ºC.
Fig. 6.0V.1: Available load current vs. ambient air Fig. 6.0V.2: Available load current vs. ambient air
temperature and airflow rates for SQ48T08060 converter temperature and airflow rates for SQ48T08060 converter
with D height pins mounted vertically with Vin = 48V, air with D height pins mounted horizontally with Vin = 48V,
flowing from pin 3 to pin 1, and maximum FET air flowing from pin 3 to pin 1, and maximum FET
temperature ≤ 120° C. temperature ≤ 120° C.
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BCD.00637_AA
Fig. 6.0V.3: Available load current vs. ambient air Fig. 6.0V.4: Available load current vs. ambient air
temperature and airflow rates for SQ48S08060 converter temperature and airflow rates for SQ48S08060 converter
mounted vertically with Vin = 48V, air flowing from pin 3 mounted horizontally with Vin = 48V, air flowing from pin
to pin 1, and maximum FET temperature ≤ 120°C. 3 to pin 1, and maximum FET temperature ≤ 120°C.
Fig. 6.0V.5: Efficiency vs. load current and input voltage for Fig. 6.0V.6: Efficiency vs. load current and ambient
SQ48T/S08060 converter mounted vertically with air temperature for SQ48T/S08060 converter mou
flowing from pin 3 to pin 1 at a rate of 300 LFM (1.5 m/s) vertically with Vin = 48V and air flowing from pin 3 to pin
and Ta = 25°C. 1 at a rate of 200 LFM (1.0 m/s).
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BCD.00637_AA
Fig. 6.0V.7: Power dissipation vs. load current and Fig. 6.0V.8: Power dissipation vs. load current and
input voltage for SQ48T/S08060 converter mounted ambient temperature for SQ48T/S08060 converter
vertically with air flowing from pin 3 to pin 1 at a rate of mounted vertically with Vin = 48V and air flowing from
300 LFM (1.5 m/s) and Ta = 25° C. pin 3 to pin 1 at a rate of 200 LFM (1.0 m/s).
Fig. 6.0V.9: Turn-on transient at full rated load current Fig. 6.0V.10: Turn-on transient at full rated load
(resistive) with no output capacitor at Vin = 48V, current (resistive) plus 10,000 μF at Vin = 48V,
triggered via ON/OFF pin. Top trace: ON/OFF signal triggered via ON/OFF pin. Top trace: ON/OFF signal
(5 V/div.). Bottom trace: output voltage (2V/div.). Time (5 V/div.). Bottom trace: output voltage (2V/div.). Time
scale: 2 ms/div. scale: 5 ms/div.
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BCD.00637_AA
Fig. 6.0V.11: Output voltage response to load current Fig. 6.0V.12: Output voltage response to load current
step-change (2 A – 4 A – 2 A) at Vin = 48V. Top trace: step-change (2 A – 4 A – 2 A) at Vin = 48V. Top trace:
output voltage (100 mV/div.). Bottom trace: load current output voltage (100 mV/div.). Bottom trace: load current
(2 A/div.). Current slew rate: 0.1A/μs. Co = 1μF ceramic. (2 A/div.). Current slew rate: 5A/μs. Co = 450μF
Time scale: 0.2 ms/div. tantalum + 1μF ceramic. Time scale: 0.2ms/div.
Fig. 6.0V.13: Output voltage ripple (50mV/div.) at full Fig. 6.0V.14: Test Setup for measuring input reflected
rated load current into a resistive load with Co = 10 μF ripple currents, ic and is
tantalum + 1μF ceramic and Vin = 48V. Time scale: 1μs/div.
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BCD.00637_AA
Fig. 6.0V.15: Input reflected ripple current, ic Fig. 6.0V.16: Input reflected ripple current, is
(100 mA/div.), measured at input terminals at full rated (10 mA/div.), measured through 10 μH at the source at
load current and Vin = 48V. Refer to Fig. 6.0V.14 for test full rated load current and Vin = 48V. Refer to
setup. Time scale: 1 μs/div. Fig. 6.0V.14 for test setup. Time scale: 1 μs/div.
Fig. 6.0V.17: Output voltage vs. load current showing Fig. 6.0V.18: Load current (top trace, 10A/div.,
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BCD.00637_AA
current limit point and converter shutdown point. Input 20 ms/div.) into a 10 mΩ short circuit during restart, at
voltage has almost no effect on current limit Vin = 48V. Bottom trace (10A/div., 1ms/div.) is an
characteristic. expansion of the on-time portion of the top trace.
Conditions: T A
= 25 º C, Airflow = 300 LFM (1.5 m/s), Vin = 48 VDC, Vout = 5.0 VDC, unless otherwise specified.
Parameter
Notes
Min
Typ
Max
Units
Input Characteristics
Maximum Input Current
10 ADC, 5.0 VDC Out @ 36 VDC In
1.65
ADC
Input Stand-by Current
Vin = 48V, converter disabled
2.6
mADC
Input No Load Current (0 load on
the output)
Vin = 48V, converter enabled
40
mADC
Input Reflected-Ripple Current
25MHz bandwidth
6
mAPK-
PK
Input Voltage Ripple Rejection
120HZ
TBD
dB
Output Characteristics
Output Voltage Set Point (no load)
4.950
5.000
5.050
VDC
Output Regulation
Over Line
±2
±5
mV
Over Load
±2
±5
mV
Output Voltage Range
Over line, load and temperature1
4.925
5.075
VDC
Output Ripple and Noise - 25 MHz
bandwidth
Full load + 10 μF tantalum + 1 μF ceramic
45
80
mVPK-
PK
External Load Capacitance
Plus full load (resistive)
10,000
μF
Output Current Range
0
10
ADC
Current Limit Inception
Non-latching
10.5
12.5
14
ADC
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BCD.00637_AA
Peak Short-Circuit Current
Non-latching, Short =10 mΩ.
20
30
A
RMS Short-Circuit Current
Non-latching
5.3
Arms
Dynamic Response
Load Change 25% of Iout Max,
di/dt = 0.1 A/μs
Co = 1 μF ceramic
200
mV
di/dt = 5 A/μs
Co = 450 μF tantalum + 1 μF ceramic
180
mV
Settling Time to 1%
400
μs
Efficiency
100% Load
87.0
%
50% Load
88.0
%
1-40 ºC to 85 ºC.
Fig. 5.0V.1: Available load current vs. ambient air Fig. 5.0V.2: Available load current vs. ambient air
temperature and airflow rates for SQ48T10050 converter temperature and airflow rates for SQ48T10050 converter
with D height pins mounted vertically with Vin = 48V, air with D height pins mounted horizontally with Vin = 48V,
flowing from pin 3 to pin 1, and maximum FET air flowing from pin 3 to pin 1, and maximum FET
temperature ≤ 120° C. temperature ≤ 120°C.
Fig. 5.0V.3: Available load current vs. ambient air Fig. 5.0V.4: Available load current vs. ambient air
temperature and airflow rates for SQ48S10050 converter temperature and airflow rates for SQ48S10050 converter
mounted vertically with Vin = 48V, air flowing from pin 3 mounted horizontally with Vin = 48V, air flowing from pin
to pin 1, and maximum FET temperature ≤ 120°C. 3 to pin 1, and maximum FET temperature ≤ 120° C.
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BCD.00637_AA
Fig. 5.0V.5: Efficiency vs. load current and input voltage for Fig. 5.0V.6: Efficiency vs. load current and ambient
SQ48T/S10050 converter mounted vertically with air temperature for SQ48T/S10050 converter mounted
flowing from pin 3 to pin 1 at a rate of 300 LFM (1.5 m/s) vertically with Vin = 48V and air flowing from pin 3 to pin
and Ta = 25°C. 1 at a rate of 200 LFM (1.0m/s).
Fig. 5.0V.7: Power dissipation vs. load current and Fig. 5.0V.8: Power dissipation vs. load current and
input voltage for SQ48T/S10050 converter mounted ambient temperature for SQ48T/S10050 converter
vertically with air flowing from pin 3 to pin 1 at a rate of mounted vertically with Vin = 48V and air flowing from
300 LFM (1.5m/s) and Ta = 25°C. pin 3 to pin 1 at a rate of 200 LFM (1.0m/s).
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BCD.00637_AA
Fig. 5.0V.9: Turn-on transient at full rated load current Fig. 5.0V.10: Turn-on transient at full rated load
(resistive) with no output capacitor at Vin = 48V, current (resistive) plus 10,000 μF at Vin = 48V,
triggered via ON/OFF pin. Top trace: ON/OFF signal triggered via ON/OFF pin. Top trace: ON/OFF signal
(5 V/div.). Bottom trace: output voltage (2 V/div.). Time (5 V/div.). Bottom trace: output voltage (2 V/div.). Time
scale: 2ms/div. scale: 2ms/div.
Fig. 5.0V.11: Output voltage response to load current Fig. 5.0V.12: Output voltage response to load current
step-change (2.5A – 5A – 2.5A) at Vin = 48V. Top trace: step-change (2.5A – 5A – 2.5A) at Vin = 48V. Top trace:
output voltage (200 mV/div.). Bottom trace: load current output voltage (200 mV/div.). Bottom trace: load current
(2 A/div.). Current slew rate: 0.1A/μs. Co = 1μF ceramic. (2A/div.). Current slew rate: 5A/μs.
Time scale: 0.2ms/div. Co = 450μF tantalum + 1μF ceramic. Time scale:
0.2 ms/div.
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BCD.00637_AA
Fig. 5.0V.13: Output voltage ripple (20 mV/div.) at full Fig. 5.0V.14: Test Setup for measuring input reflected
rated load current into a resistive load with Co = 10 μF ripple currents, ic and is.
tantalum + 1μF ceramic and Vin = 48V. Time scale: 1μs/div.
Fig. 5.0V.15: Input reflected ripple current, ic Fig. 5.0V.16: Input reflected ripple current, is
(100 mA/div.), measured at input terminals at full rated (10 mA/div.), measured through 10μH at the source at
load current and Vin = 48V. Refer to Fig. 5.0V.14 for test full rated load current and Vin = 48V. Refer to
setup. Time scale: 1μs/div. Fig. 5.0V.14 for test setup. Time scale: 1μs/div.
Fig. 5.0V.17: Output voltage vs. load current showing Fig. 5.0V.18: Load current (top trace, 10A/div.,
current limit point and converter shutdown point. Input 20 ms/div.) into a 10 mΩ short circuit during restart, at
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BCD.00637_AA
voltage has almost no effect on current limit Vin = 48V. Bottom trace (10A/div., 1ms/div.) is an
characteristic. expansion of the on-time portion of the top trace.
Conditions: T A
= 25 º C, Airflow = 300 LFM (1.5 m/s), Vin = 48 VDC, Vout = 3.3 VDC, unless otherwise specified.
Parameter
Notes
Min
Typ
Max
Units
Input Characteristics
Maximum Input Current
15 ADC, 3.3 VDC Out @ 36 VDC In
1.6
ADC
Input Stand-by Current
Vin = 48V, converter disabled
2.6
mADC
Input No Load Current (0 load on
the output)
Vin = 48V, converter enabled
42
mADC
Input Reflected-Ripple Current
25MHz bandwidth
6
mAPK-
PK
Input Voltage Ripple Rejection
120HZ
TBD
dB
Output Characteristics
Output Voltage Set Point (no load)
3.267
3.300
3.333
VDC
Output Regulation
Over Line
±2
±5
mV
Over Load
±2
±5
mV
Output Voltage Range
Over line, load and temperature1
3.250
3.350
VDC
Output Ripple and Noise - 25 MHz
bandwidth
Full load + 10 μF tantalum + 1 μF ceramic
30
50
mVPK-
PK
External Load Capacitance
Plus full load (resistive)
15,000
μF
Output Current Range
0
15
ADC
Current Limit Inception
Non-latching
15.75
18
20
ADC
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BCD.00637_AA
Peak Short-Circuit Current
Non-latching, Short =10 mΩ.
30
40
A
RMS Short-Circuit Current
Non-latching
5.3
Arms
Dynamic Response
Load Change 25% of Iout Max,
di/dt = 0.1 A/μs
Co = 1 μF ceramic
80
mV
di/dt = 5 A/μs
Co = 450 μF tantalum + 1 μF ceramic
140
mV
Settling Time to 1%
100
μs
Efficiency
100% Load
89.5
%
50% Load
89.5
%
1-40 ºC to 85 ºC.
Fig. 3.3V.1: Available load current vs. ambient air Fig. 3.3V.1: Available load current vs. ambient air
temperature and airflow rates for SQ48T15033 converter temperature and airflow rates for SQ48T15033 converter
with D height pins mounted vertically with Vin = 48V, air with D height pins mounted horizontally with Vin = 48V,
flowing from pin 3 to pin 1, and maximum FET air flowing from pin 3 to pin 1, and maximum FET
temperature ≤ 120° C. temperature ≤ 120°C.
Fig. 3.3V.3: Available load current vs. ambient air Fig. 3.3V.4: Available load current vs. ambient air
temperature and airflow rates for SQ48S15033 converter temperature and airflow rates for SQ48S15033 converter
mounted vertically with Vin = 48V, air flowing from pin 3 mounted horizontally with Vin = 48V, air flowing from pin
to pin 1, and maximum FET temperature ≤ 120°C. 3 to pin 1, and maximum FET temperature ≤ 120° C.
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Fig. 3.3V.5: Efficiency vs. load current and input voltage Fig. 3.3V.6: Efficiency vs. load current and ambient
for SQ48T/S15033 converter mounted vertically with air temperature for SQ48T/S15033 converter mounted
flowing from pin 3 to pin 1 at a rate of 300 LFM (1.5m/s) vertically with Vin = 48V and air flowing from pin 3 to pin
and Ta = 25°C. 1 at a rate of 200 LFM (1.0m/s).
Fig. 3.3V.7: Power dissipation vs. load current and Fig. 3.3V.8: Power dissipation vs. load current and
input voltage for SQ48T/S15033 converter mounted ambient temperature for SQ48T/S15033 converter
vertically with air flowing from pin 3 to pin 1 at a rate of mounted vertically with Vin = 48 V and air flowing from
300 LFM (1.5 m/s) and Ta = 25 ° C. pin 3 to pin 1 at a rate of 200 LFM (1.0 m/s).
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Fig. 3.3V.9: Turn-on transient at full rated load current Fig. 3.3V.10: Turn-on transient at full rated load
(resistive) with no output capacitor at Vin = 48 V, current (resistive) plus 10,000 μF at Vin = 48 V,
triggered via ON/OFF pin. Top trace: ON/OFF signal triggered via ON/OFF pin. Top trace: ON/OFF signal
(5 V/div.). Bottom trace: output voltage (1 V/div.). Time (5 V/div.). Bottom trace: output voltage (1 V/div.). Time
scale: 2 ms/div. scale: 2 ms/div.
Fig. 3.3V.11: Output voltage response to load current Fig. 3.3V.12: Output voltage response to load current
step-change (3.75 A – 7.5 A – 3.75 A) at Vin = 48 V. step-change (3.75 A – 7.5 A – 3.75 A) at Vin = 48 V.
Top trace: output voltage (100 mV/div.). Bottom trace: Top trace: output voltage (100 mV/div.). Bottom trace:
load current (5 A/div.). Current slew rate: 0.1 A/μs. load current (5 A/div.). Current slew rate: 5 A/μs. Co =
Co = 1 μF ceramic. Time scale: 0.2 ms/div. 450 μF tantalum + 1 μF ceramic. Time scale: 0.2 ms/div.
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Fig. 3.3V.13: Output voltage ripple (20 mV/div.) at full Fig. 3.3V.14: Test Setup for measuring input reflected
rated load current into a resistive load with Co = 10 μF ripple currents, ic and is
tantalum + 1 μF ceramic and Vin = 48 V. Time scale: 1 μs/div.
Fig. 3.3V.15: Input reflected ripple current, ic Fig. 3.3V.16: Input reflected ripple current, is
(100 mA/div.), measured at input terminals at full rated (10 mA/div.), measured through 10 μH at the source at
load current and Vin = 48 V. Refer to Fig. 3.3V.14 for full rated load current and Vin = 48 V. Refer to
test setup. Time scale: 1 μs/div. Fig. 3.3V.14 for test setup. Time scale: 1 μs/div.
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Fig. 3.3V.17: Output voltage vs. load current showing Fig. 3.3V.18: Load current (top trace, 20 A/div.,
current limit point and converter shutdown point. Input 20 ms/div.) into a 10 mΩ short circuit during restart, at
voltage has almost no effect on current limit Vin = 48 V. Bottom trace (20 A/div., 1 ms/div.) is an
characteristic. expansion of the on-time portion of the top trace.
Conditions: T A
= 25ºC, Airflow = 300 LFM (1.5 m/s), Vin = 48 VDC, Vout = 2.5 VDC, unless otherwise specified.
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Parameter
Notes
Min
Typ
Max
Units
Input Characteristics
Maximum Input Current
15 ADC, 2.5 VDC Out @ 36 VDC In
1.2
ADC
Input Stand-by Current
Vin = 48V, converter disabled
2.6
mADC
Input No Load Current (0 load on
the output)
Vin = 48V, converter enabled
34
mADC
Input Reflected-Ripple Current
25MHz bandwidth
6
mAPK-
PK
Input Voltage Ripple Rejection
120HZ
TBD
dB
Output Characteristics
Output Voltage Set Point (no load)
2.475
2.500
2.525
VDC
Output Regulation
Over Line
±2
±5
mV
Over Load
±2
±5
mV
Output Voltage Range
Over line, load and temperature1
2.462
2.538
VDC
Output Ripple and Noise - 25 MHz
bandwidth
Full load + 10 μF tantalum + 1 μF ceramic
30
50
mVPK-
PK
External Load Capacitance
Plus full load (resistive)
15,000
μF
Output Current Range
0
15
ADC
Current Limit Inception
Non-latching
15.75
18
20
ADC
Peak Short-Circuit Current
Non-latching, Short =10 mΩ.
30
40
A
RMS Short-Circuit Current
Non-latching
5.3
Arms
Dynamic Response
Load Change 25% of Iout Max,
di/dt = 0.1 A/μs
Co = 1 μF ceramic
120
mV
di/dt = 5 A/μs
Co = 450 μF tantalum + 1 μF ceramic
120
mV
Settling Time to 1%
100
μs
Efficiency
100% Load
87.0
%
50% Load
87.5
%
1-40 ºC to 85 ºC.
Fig. 2.5V.1: Available load current vs. ambient air Fig. 2.5V.2: Available load current vs. ambient air
temperature and airflow rates for SQ48T15025 converter temperature and airflow rates for SQ48T15025 converter
with D height pins mounted vertically with Vin = 48 V, air with D height pins mounted horizontally with Vin = 48 V, air
flowing from pin 3 to pin 1, and maximum FET flowing from pin 3 to pin 1, and maximum FET temperature
temperature ≤ 120 ° C. ≤ 120 °C.
Fig. 2.5V.3: Available load current vs. ambient air Fig. 2.5V.4: Available load current vs. ambient air
temperature and airflow rates for SQ48S15025 converter temperature and airflow rates for SQ48S15025 converter
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mounted vertically with Vin = 48 V, air flowing from pin 3 mounted horizontally with Vin = 48 V, air flowing from pin
to pin 1, and maximum FET temperature ≤ 120 ° C. 3 to pin 1, and maximum FET temperature ≤ 120 °C.
Fig. 2.5V.5: Efficiency vs. load current and input voltage Fig. 2.5V.6: Efficiency vs. load current and ambient
for SQ48T/S15025 converter mounted vertically with air temperature for SQ48T/S15025 converter mounted
flowing from pin 3 to pin 1 at a rate of 300 LFM (1.5 m/s) vertically with Vin = 48 V and air flowing from pin 3 to pin
and Ta = 25 °C. 1 at a rate of 200 LFM (1.0 m/s).
Fig. 2.5V.7: Power dissipation vs. load current and Fig. 2.5V.8: Power dissipation vs. load current and
input voltage for SQ48T/S15025 converter mounted ambient temperature for SQ48T/S15025 converter
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vertically with air flowing from pin 3 to pin 1 at a rate of mounted vertically with Vin = 48 V and air flowing from
300 LFM (1.5 m/s) and Ta = 25 ° C. pin 3 to pin 1 at a rate of 200 LFM (1.0 m/s).
Fig. 2.5V.9: Turn-on transient at full rated load current Fig. 2.5V.10: Turn-on transient at full rated load
(resistive) with no output capacitor at Vin = 48 V, current (resistive) plus 10,000 μF at Vin = 48 V,
triggered via ON/OFF pin. Top trace: ON/OFF signal triggered via ON/OFF pin. Top trace: ON/OFF signal
(5 V/div.). Bottom trace: output voltage (1 V/div.). Time (5 V/div.). Bottom trace: output voltage (1 V/div.). Time
scale: 2 ms/div. scale: 2 ms/div.
Fig. 2.5V.11: Output voltage response to load current Fig. 2.5V.12: Output voltage response to load current
step-change (3.75 A – 7.5 A – 3.75 A) at Vin = 48 V. step-change (3.75 A – 7.5 A – 3.75 A) at Vin = 48 V
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Top trace: output voltage (100 mV/div.). Bottom trace: Top trace: output voltage (100 mV/div.). Bottom trace:
load current (5 A/div.). Current slew rate: 0.1 A/μs load current (5 A/div.). Current slew rate: 5 A/μs. Co =
Co = 1 μF ceramic. Time scale: 0.2 ms/div. 450 μF tantalum + 1 μF ceramic. Time scale: 0.2 ms/div.
Fig. 2.5V.13: Output voltage ripple (20 mV/div.) at full Fig. 2.5V.14: Test Setup for measuring input reflected
rated load current into a resistive load with Co = 10 μF ripple currents, ic and is
tantalum + 1 μF ceramic and Vin = 48 V. Time scale: 1 μs/div.
Fig. 2.5V.15: Input reflected ripple current, ic Fig. 2.5V.16: Input reflected ripple current, is
(100 mA/div.), measured at input terminals at full rated (10 mA/div.), measured through 10 μH at the source at
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load current and Vin = 48 V. Refer to Fig. 2.5V.14 for full rated load current and Vin = 48 V. Refer to
test setup. Time scale: 1 μs/div. Fig. 2.5V.14 for test setup. Time scale: 1 μs/div.
Fig. 2.5V.17: Output voltage vs. load current showing Fig. 2.5V.18: Load current (top trace, 20 A/div.,
current limit point and converter shutdown point. Input 20 ms/div.) into a 10 mΩ short circuit during restart, at
voltage has almost no effect on current limit Vin = 48 V. Bottom trace (20 A/div., 1 ms/div.) is an
characteristic. expansion of the on-time portion of the top trace.
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BCD.00637_AA
Conditions: T A
= 25 º C, Airflow = 300 LFM (1.5 m/s), Vin = 48 VDC, Vout = 2.0 VDC, unless otherwise specified.
Parameter
Notes
Min
Typ
Max
Units
Input Characteristics
Maximum Input Current
15 ADC, 2.0 VDC Out @ 36 VDC In
1.0
ADC
Input Stand-by Current
Vin = 48V, converter disabled
3
mADC
Input No Load Current (0 load on
the output)
Vin = 48V, converter enabled
31
mADC
Input Reflected-Ripple Current
25MHz bandwidth
6
mAPK-
PK
Input Voltage Ripple Rejection
120HZ
TBD
dB
Output Characteristics
Output Voltage Set Point (no load)
1.98
2.000
2.02
VDC
Output Regulation
Over Line
±2
±5
mV
Over Load
±2
±5
mV
Output Voltage Range
Over line, load and temperature1
1.970
2.030
VDC
Output Ripple and Noise - 25 MHz
bandwidth
Full load + 10 μF tantalum + 1 μF ceramic
30
50
mVPK-
PK
External Load Capacitance
Plus full load (resistive)
15,000
μF
Output Current Range
0
15
ADC
Current Limit Inception
Non-latching
15.75
18
20
ADC
Peak Short-Circuit Current
Non-latching, Short =10 mΩ.
30
40
A
RMS Short-Circuit Current
Non-latching
5.3
Arms
Dynamic Response
Load Change 25% of Iout Max,
di/dt = 0.1 A/μs
Co = 1 μF ceramic
80
mV
di/dt = 5 A/μs
Co = 450 μF tantalum + 1 μF ceramic
60
mV
Settling Time to 1%
60
μs
Efficiency
100% Load
86.5
%
50% Load
87.0
%
1-40 º C to 85 º C.
Fig. 2.0V.1: Available load current vs. ambient air Fig. 2.0V.2: Available load current vs. ambient air
temperature and airflow rates for SQ48T15020 converter temperature and airflow rates for SQ48T15020 converter
with D height pins mounted vertically with Vin = 48 V, air with D height pins mounted horizontally with Vin = 48 V,
flowing from pin 3 to pin 1, and maximum FET air flowing from pin 3 to pin 1, and maximum FET
temperature ≤ 120 ° C. temperature ≤ 120 °C.
Fig. 2.0V.3: Available load current vs. ambient air Fig. 2.0V.4: Available load current vs. ambient air
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temperature and airflow rates for SQ48S15020 converter temperature and airflow rates for SQ48S15020 converter
mounted vertically with Vin = 48 V, air flowing from pin 3 mounted horizontally with Vin = 48 V, air flowing from pin
to pin 1, and maximum FET temperature ≤ 120 ° C. 3 to pin 1, and maximum FET temperature ≤ 120 ° C.
Fig. 2.0V.5: Efficiency vs. load current and input voltage Fig. 2.0V.6: Efficiency vs. load current and ambient
for SQ48T/S15020 converter mounted vertically with air for SQ48T/S15020 converter mounted vertically with air
flowing from pin 3 to pin 1 at a rate of 300 LFM (1.5 m/s) vertically with Vin = 48 V and air flowing from pin 3 to pin
and Ta = 25 °C. 1 at a rate of 200 LFM (1.0 m/s).
Fig. 2.0V.7: Power dissipation vs. load current and Fig. 2.0V.8: Power dissipation vs. load current and
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input voltage for SQ48T/S15020 converter mounted ambient temperature for SQ48T/S15020 converter
vertically with air flowing from pin 3 to pin 1 at a rate of mounted vertically with Vin = 48 V and air flowing from
300 LFM (1.5 m/s) and Ta = 25 ° C. pin 3 to pin 1 at a rate of 200 LFM (1.0 m/s).
Fig. 2.0V.9: Turn-on transient at full rated load current Fig. 2.0V.9: Turn-on transient at full rated load current
(resistive) with no output capacitor at Vin = 48 V, current (resistive) plus 10,000 μF at Vin = 48 V,
triggered via ON/OFF pin. Top trace: ON/OFF signal riggered via ON/OFF pin. Top trace: ON/OFF signal
(5 V/div.). Bottom trace: output voltage (1 V/div.). Time (5 V/div.). Bottom trace: output voltage (1 V/div.). Time
scale: 2 ms/div. scale: 2 ms/div.
Fig. 2.0V.11: Output voltage response to load current Fig. 2.0V.12: Output voltage response to load current
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step-change (3.75 A – 7.5 A – 3.75 A) at Vin = 48 V. step-change (3.75 A – 7.5 A – 3.75 A) at Vin = 48 V.
Top trace: output voltage (100 mV/div.). Bottom trace: Top trace: output voltage (100 mV/div.). Bottom trace:
load current (5 A/div.). Current slew rate: 0.1 A/μs. load current (5 A/div.). Current slew rate: 5 A/μs. Co =
Co = 1 μF ceramic. Time scale: 0.2 ms/div. 450 μF tantalum + 1 μF ceramic. Time scale: 0.2 ms/div.
Fig. 2.0V.13: Output voltage ripple (20 mV/div.) at full Fig. 2.0V.13: Output voltage ripple (20 mV/div.) at full
rated load current into a resistive load with Co = 10 μF ripple currents, ic and is
tantalum + 1 μF ceramic and Vin = 48 V. Time scale:
1 μs/div.
Fig. 2.0V.15: Input reflected ripple current, ic Fig. 2.0V.16: Input reflected ripple current, is
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(100 mA/div.), measured at input terminals at full rated (10 mA/div.), measured through 10 μH at the source at
load current and Vin = 48 V. Refer to Fig. 2.0V.14 for full rated load current and Vin = 48 V. Refer to
test setup. Time scale: 1 μs/div. test setup. Time scale: 1 μs/div.
Fig. 2.0V.17: Output voltage vs. load current showing Fig. 2.0V.18: Load current (top trace, 20 A/div.,
current limit point and converter shutdown point. Input 20 ms/div.) into a 10 mΩ short circuit during restart, at
voltage has almost no effect on current limit Vin = 48 V. Bottom trace (20 A/div., 1 ms/div.) is an
characteristic. expansion of the on-time portion of the top trace.
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BCD.00637_AA
Conditions: T A
= 25 º C, Airflow = 300 LFM (1.5 m/s), Vin = 48 VDC, Vout = 1.8 VDC, unless otherwise specified.
Parameter
Notes
Min
Typ
Max
Units
Input Characteristics
Maximum Input Current
15 ADC, 1.8 VDC Out @ 36 VDC In
0.9
ADC
Input Stand-by Current
Vin = 48V, converter disabled
2.6
mADC
Input No Load Current (0 load on
the output)
Vin = 48V, converter enabled
29
mADC
Input Reflected-Ripple Current
25MHz bandwidth
6
mAPK-
PK
Input Voltage Ripple Rejection
120HZ
TBD
dB
Output Characteristics
Output Voltage Set Point (no load)
1.782
1.800
1.818
VDC
Output Regulation
Over Line
±2
±4
mV
Over Load
±2
±5
mV
Output Voltage Range
Over line, load and temperature1
1.773
1.827
VDC
Output Ripple and Noise - 25 MHz
bandwidth
Full load + 10 μF tantalum + 1 μF ceramic
30
50
mVPK-
PK
External Load Capacitance
Plus full load (resistive)
15,000
μF
Output Current Range
0
15
ADC
Current Limit Inception
Non-latching
15.75
18
20
ADC
Peak Short-Circuit Current
Non-latching, Short =10 mΩ.
30
40
A
RMS Short-Circuit Current
Non-latching
5.3
Arms
Dynamic Response
Load Change 25% of Iout Max,
di/dt = 0.1 A/μs
Co = 1 μF ceramic
80
mV
di/dt = 5 A/μs
Co = 450 μF tantalum + 1 μF ceramic
100
mV
Settling Time to 1%
100
μs
Efficiency
100% Load
85.5
%
50% Load
86.0
%
1-40 ºC to 85 ºC.
Fig. 1.8V.1: Available load current vs. ambient air Fig. 1.8V.2: Available load current vs. ambient air
temperature and airflow rates for SQ48T15018 converter temperature and airflow rates for SQ48T15018 converter
with D height pins mounted vertically with Vin = 48 V, air with D height pins mounted horizontally with Vin = 48 V,
flowing from pin 3 to pin 1, and maximum FET air flowing from pin 3 to pin 1, and maximum FET
temperature ≤ 120 ° C. temperature ≤ 120 ° C.
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Fig. 1.8V.3: Available load current vs. ambient air Fig. 1.8V.4: Available load current vs. ambient air
temperature and airflow rates for SQ48S15018 converter temperature and airflow rates for SQ48S15018 converter
mounted vertically with Vin = 48 V, air flowing from pin 3 mounted horizontally with Vin = 48 V, air flowing from pin
to pin 1, and maximum FET temperature ≤ 120 ° C. 3 to pin 1, and maximum FET temperature ≤ 120 °C.
Fig. 1.8V.5: Efficiency vs. load current and input voltage Fig. 1.8V.6: Efficiency vs. load current and ambient
for SQ48T/S15018 converter mounted vertically with air temperature for SQ48T/S15018 converter mounted
flowing from pin 3 to pin 1 at a rate of 300 LFM (1.5 m/s) vertically with Vin = 48 V and air flowing from pin 3 to pin
and Ta = 25 °C. 1 at a rate of 200 LFM (1.0 m/s).
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Fig. 1.8V.7: Power dissipation vs. load current and Fig. 1.8V.8: Power dissipation vs. load current and
input voltage for SQ48T/S15018 converter mounted ambient temperature for SQ48T/S15018 converter
vertically with air flowing from pin 3 to pin 1 at a rate of vertically with air flowing from pin 3 to pin 1 at a rate of
300 LFM (1.5 m/s) and Ta = 25 ° C. pin 3 to pin 1 at a rate of 200 LFM (1.0 m/s).
Fig. 1.8V.9: Turn-on transient at full rated load current Fig. 1.8V.10: Turn-on transient at full rated load
(resistive) with no output capacitor at Vin = 48 V, current (resistive) plus 10,000 μF at Vin = 48 V,
triggered via ON/OFF pin. Top trace: ON/OFF signal triggered via ON/OFF pin. Top trace: ON/OFF signal
(5 V/div.). Bottom trace: output voltage (1 V/div.). Time (5 V/div.). Bottom trace: output voltage (1 V/div.). Time
scale: 2 ms/div. scale: 2 ms/div.
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Fig. 1.8V.11: Output voltage response to load current Fig. 1.8V.12: Output voltage response to load current
step-change (3.75 A – 7.5 A – 3.75 A) at Vin = 48 V. step-change (3.75 A – 7.5 A – 3.75 A) at Vin = 48 V.
Top trace: output voltage (100 mV/div.). Bottom trace: Top trace: output voltage (100 mV/div.). Bottom trace:
load current (5 A/div.). Current slew rate: 0.1 A/μs. load current (5 A/div.). Current slew rate: 5 A/μs. Co =
Co = 1 μF ceramic. Time scale: 0.2 ms/div. 450 μF tantalum + 1 μF ceramic. Time scale: 0.2 ms/div.
Fig. 1.8V.13: Output voltage ripple (20 mV/div.) at full Fig. 1.8V.14: Test Setup for measuring input reflected
rated load current into a resistive load with Co = 10 μF ripple currents, ic and is
tantalum + 1 μF ceramic and Vin = 48 V. Time scale: 1 μs/div.
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Fig. 1.8V.15: Input reflected ripple current, ic Fig. 1.8V.16: Input reflected ripple current, is
(100 mA/div.), measured at input terminals at full rated (10 mA/div.), measured through 10 μH at the source at
load current and Vin = 48 V. Refer to Fig. 1.8V.14 for full rated load current and Vin = 48 V. Refer to
test setup. Time scale: 1 μs/div. Fig. 1.8V.14 for test setup. Time scale: 1 μs/div.
Fig. 1.8V.17: Output voltage vs. load current showing Fig. 1.8V.18: Load current (top trace, 20 A/div.,
Fig. 1.8V.18: Load current (top trace, 20 A/div., 20 ms/div.) into a 10 mΩ short circuit during restart, at
voltage has almost no effect on current limit Vin = 48 V. Bottom trace (20 A/div., 1 ms/div.) is an
characteristic. expansion of the on-time portion of the top trace.
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BCD.00637_AA
Conditions: T A
= 25 º C, Airflow = 300 LFM (1.5 m/s), Vin = 48 VDC, Vout = 1.5 VDC, unless otherwise specified.
Parameter
Notes
Min
Typ
Max
Units
Input Characteristics
Maximum Input Current
15 ADC, 1.5 VDC Out @ 36 VDC In
0.75
ADC
Input Stand-by Current
Vin = 48V, converter disabled
2.6
mADC
Input No Load Current (0 load on
the output)
Vin = 48V, converter enabled
25
mADC
Input Reflected-Ripple Current
25MHz bandwidth
6
mAPK-
PK
Input Voltage Ripple Rejection
120HZ
TBD
dB
Output Characteristics
Output Voltage Set Point (no load)
1.485
1.500
1.515
VDC
Output Regulation
Over Line
±2
±4
mV
Over Load
±2
±4
mV
Output Voltage Range
Over line, load and temperature1
1.477
1.523
VDC
Output Ripple and Noise - 25 MHz
bandwidth
Full load + 10 μF tantalum + 1 μF ceramic
30
50
mVPK-
PK
External Load Capacitance
Plus full load (resistive)
15,000
μF
Output Current Range
0
15
ADC
Current Limit Inception
Non-latching
15.75
18
20
ADC
Peak Short-Circuit Current
Non-latching, Short =10 mΩ.
30
40
A
RMS Short-Circuit Current
Non-latching
5.3
Arms
Dynamic Response
Load Change 25% of Iout Max,
di/dt = 0.1 A/μs
Co = 1 μF ceramic
80
mV
di/dt = 5 A/μs
Co = 450 μF tantalum + 1 μF ceramic
120
mV
Settling Time to 1%
100
μs
Efficiency
100% Load
84.5
%
50% Load
85.0
%
1-40 ºC to 85 ºC.
Fig. 1.5V.1: Available load current vs. ambient air Fig. 1.5V.2: Available load current vs. ambient air
temperature and airflow rates for SQ48T15015 converter temperature and airflow rates for SQ48T15015 converter
with D height pins mounted vertically with Vin = 48 V, air with D height pins mounted horizontally with Vin = 48 V,
flowing from pin 3 to pin 1, and maximum FET air flowing from pin 3 to pin 1, and maximum FET
temperature ≤ 120 ° C. temperature ≤ 120 °C.
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Fig. 1.5V.3: Available load current vs. ambient air Fig. 1.5V.4: Available load current vs. ambient air
temperature and airflow rates for SQ48S15015 converter temperature and airflow rates for SQ48S15015 converte
mounted vertically with Vin = 48 V, air flowing from pin 3 mounted horizontally with Vin = 48 V, air flowing from pin
to pin 1, and maximum FET temperature ≤ 120 ° C. 3 to pin 1, and maximum FET temperature ≤ 120 °C.
Fig. 1.5V.5: Efficiency vs. load current and input voltage Fig. 1.5V.6: Efficiency vs. load current and ambient
for SQ48T/S15015 converter mounted vertically with air temperature for SQ48T/S15015 converter mounted
flowing from pin 3 to pin 1 at a rate of 300 LFM (1.5 m/s) vertically with Vin = 48 V and air flowing from pin 3 to pin
and Ta = 25 °C. 1 at a rate of 200 LFM (1.0 m/s).
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Fig. 1.5V.7: Power dissipation vs. load current and Fig. 1.5V.8: Power dissipation vs. load current and
input voltage for SQ48T/S15015 converter mounted ambient temperature for SQ48T/S15015 converter
vertically with air flowing from pin 3 to pin 1 at a rate of mounted vertically with Vin = 48 V and air flowing from
300 LFM (1.5 m/s) and Ta = 25 ° C. pin 3 to pin 1 at a rate of 200 LFM (1.0 m/s).
Fig. 1.5V.9: Turn-on transient at full rated load current Fig. 1.5V.10: Turn-on transient at full rated load
(resistive) with no output capacitor at Vin = 48 V, current (resistive) plus 10,000 μF at Vin = 48 V,
triggered via ON/OFF pin. Top trace: ON/OFF signal triggered via ON/OFF pin. Top trace: ON/OFF signal
(5 V/div.). Bottom trace: output voltage (0.5 V/div.). Time (5 V/div.). Bottom trace: output voltage (0.5 V/div.).
scale: 2 ms/div. Time scale: 2 ms/div.
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Fig. 1.5V.11: Output voltage response to load current Fig. 1.5V.12: Output voltage response to load current
step-change (3.75 A – 7.5 A – 3.75 A) at Vin = 48 V. step-change (3.75 A – 7.5 A – 3.75 A) at Vin = 48 V.
Top trace: output voltage (100 mV/div.). Bottom trace: Top trace: output voltage (100 mV/div.). Bottom trace:
load current (5 A/div.). Current slew rate: 0.1 A/μs. load current (5 A/div.). Current slew rate: 5 A/μs. Co =
Co = 1 μF ceramic. Time scale: 0.2 ms/div. 450 μF tantalum + 1 μF ceramic. Time scale: 0.2 ms/div.
Fig. 1.5V.13: Output voltage ripple (20 mV/div.) at full Fig. 1.5V.14: Test Setup for measuring input reflected
rated load current into a resistive load with Co = 10 μF ripple currents, ic and is
tantalum + 1 μF ceramic and Vin = 48 V. Time scale: 1 μs/div.
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Fig. 1.5V.15: Input reflected ripple current, ic Fig. 1.5V.16: Input reflected ripple current, is
(100 mA/div.), measured at input terminals at full rated (10 mA/div.), measured through 10 μH at the source at
load current and Vin = 48 V. Refer to Fig. 1.5V.14 for full rated load current and Vin = 48 V. Refer to
test setup. Time scale: 1 μs/div. Fig. 1.5V.14 for test setup. Time scale: 1 μs/div.
Fig. 1.5V.17: Output voltage vs. load current showing Fig. 1.5V.18: Load current (top trace, 20 A/div.,
current limit point and converter shutdown point. Input 20 ms/div.) into a 10 mΩ short circuit during restart, at
voltage has almost no effect on current limit Vin = 48 V. Bottom trace (20 A/div., 1 ms/div.) is an
characteristic. expansion of the on-time portion of the top trace.
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BCD.00637_AA
Conditions: T A
= 25 ºC, Airflow = 300 LFM (1.5 m/s), Vin = 48 VDC, Vout = 1.2 VDC, unless otherwise specified.
Parameter
Notes
Min
Typ
Max
Units
Input Characteristics
Maximum Input Current
15 ADC, 1.2 VDC Out @ 36 VDC In
0.62
ADC
Input Stand-by Current
Vin = 48V, converter disabled
2.6
mADC
Input No Load Current (0 load on
the output)
Vin = 48V, converter enabled
22
mADC
Input Reflected-Ripple Current
25MHz bandwidth
6
mAPK-PK
Input Voltage Ripple Rejection
120HZ
TBD
dB
Output Characteristics
Output Voltage Set Point (no load)
1.188
1.200
1.212
VDC
Output Regulation
Over Line
±1
±3
mV
Over Load
±1
±3
mV
Output Voltage Range
Over line, load and temperature1
1.182
1.218
VDC
Output Ripple and Noise - 25 MHz
bandwidth
Full load + 10 μF tantalum + 1 μF ceramic
30
50
mVPK-PK
External Load Capacitance
Plus full load (resistive)
15,000
μF
Output Current Range
0
15
ADC
Current Limit Inception
Non-latching
15.75
18
20
ADC
Peak Short-Circuit Current
Non-latching, Short =10 mΩ.
30
40
A
RMS Short-Circuit Current
Non-latching
5.3
Arms
Dynamic Response
Load Change 25% of Iout Max,
di/dt = 0.1 A/μs
Co = 1 μF ceramic
90
mV
di/dt = 5 A/μs
Co = 450 μF tantalum + 1 μF ceramic
120
mV
Settling Time to 1%
100
μs
Efficiency
100% Load
82.0
%
50% Load
83.0
%
1-40 ºC to 85 ºC.
Fig. 1.2V.1: Available load current vs. ambient air Fig. 1.2V.2: Available load current vs. ambient air
temperature and airflow rates for SQ48T15012 converter temperature and airflow rates for SQ48T15012 converter
with D height pins mounted vertically with Vin = 48 V, air with D height pins mounted horizontally with Vin = 48 V,
flowing from pin 3 to pin 1, and maximum FET air flowing from pin 3 to pin 1, and maximum FET
temperature ≤ 120 ° C. temperature ≤ 120 °C.
© 2015 Bel Power Solutions, inc.
866.513.2839
tech.support@psbel.com
belpowersolutions.com
BCD.00637_AA
Fig. 1.2V.3: Available load current vs. ambient air Fig. 1.2V.4: Available load current vs. ambient air
temperature and airflow rates for SQ48S15012 converter temperature and airflow rates for SQ48S15012 converter
mounted vertically with Vin = 48 V, air flowing from pin 3 mounted horizontally with Vin = 48 V, air flowing from pin
to pin 1, and maximum FET temperature ≤ 120 ° C. 3 to pin 1, and maximum FET temperature ≤ 120 °C.
Fig. 1.2V.5: Efficiency vs. load current and input voltage for Fig. 1.2V.6: Efficiency vs. load current and ambient
SQ48T/S15012 converter mounted vertically with air temperature for SQ48T/S15012 converter mounted
flowing from pin 3 to pin 1 at a rate of 300 LFM (1.5 m/s) vertically with Vin = 48 V and air flowing from pin 3 to pin
and Ta = 25 °C. 1 at a rate of 200 LFM (1.0 m/s).
© 2015 Bel Power Solutions, inc.
866.513.2839
tech.support@psbel.com
belpowersolutions.com
BCD.00637_AA
Fig. 1.2V.7: Power dissipation vs. load current and Fig. 1.2V.8: Power dissipation vs. load current and
input voltage for SQ48T/S15012 converter mounted ambient temperature for SQ48T/S15012 converter
vertically with air flowing from pin 3 to pin 1 at a rate of mounted vertically with Vin = 48 V and air flowing from
300 LFM (1.5 m/s) and Ta = 25 ° C. pin 3 to pin 1 at a rate of 200 LFM (1.0 m/s).
Fig. 1.2V.9: Turn-on transient at full rated load current Fig. 1.2V.10: Turn-on transient at full rated load
(resistive) with no output capacitor at Vin = 48 V, current (resistive) plus 10,000 μF at Vin = 48 V,
triggered via ON/OFF pin. Top trace: ON/OFF signal triggered via ON/OFF pin. Top trace: ON/OFF signal
(5 V/div.). Bottom trace: output voltage (0.5 V/div.). Time (5 V/div.). Bottom trace: output voltage (0.5 V/div.).
scale: 2 ms/div. Time scale: 2 ms/div.
© 2015 Bel Power Solutions, inc.
866.513.2839
tech.support@psbel.com
belpowersolutions.com
BCD.00637_AA
Fig. 1.2V.11: Output voltage response to load current Fig. 1.2V.12: Output voltage response to load current
step-change (3.75 A – 7.5 A – 3.75 A) at Vin = 48 V. step-change (3.75 A – 7.5 A – 3.75 A) at Vin = 48 V.
Top trace: output voltage (100 mV/div.). Bottom trace: Top trace: output voltage (100 mV/div.). Bottom trace:
load current (5 A/div.). Current slew rate: 0.1 A/μs. load current (5 A/div.). Current slew rate: 5 A/μs. Co =
Co = 1 μF ceramic. Time scale: 0.2 ms/div. 450 μF tantalum + 1 μF ceramic. Time scale: 0.2 ms/div.c
Fig. 1.2V.13: Output voltage ripple (20 mV/div.) at full Fig. 1.2V.14: Test Setup for measuring input reflected
rated load current into a resistive load with Co = 10 μF ripple currents, ic and is
tantalum + 1 μF ceramic and Vin = 48 V. Time scale: 1 μs/div.
© 2015 Bel Power Solutions, inc.
866.513.2839
tech.support@psbel.com
belpowersolutions.com
BCD.00637_AA
Fig. 1.2V.15: Input reflected ripple current, ic Fig. 1.2V.16: Input reflected ripple current, is
(100 mA/div.), measured at input terminals at full rated (10 mA/div.), measured through 10 μH at the source at
load current and Vin = 48 V. Refer to Fig. 1.2V.14 for full rated load current and Vin = 48 V. Refer to
test setup. Time scale: 1 μs/div. Fig. 1.2V.14 for test setup. Time scale: 1 μs/div.
Fig. 1.2V.17: Output voltage vs. load current showing Fig. 1.2V.18: Load current (top trace, 20 A/div.,
current limit point and converter shutdown point. Input 20 ms/div.) into a 10 mΩ short circuit during restart, at
voltage has almost no effect on current limit Vin = 48 V. Bottom trace (20 A/div., 1 ms/div.) is an
characteristic. expansion of the on-time portion of the top trace.
© 2015 Bel Power Solutions, inc.
866.513.2839
tech.support@psbel.com
belpowersolutions.com
BCD.00637_AA
Conditions: T A
= 25 º C, Airflow = 300 LFM (1.5 m/s), Vin = 48 VDC, Vout = 1.0 VDC, unless otherwise specified.
Parameter
Notes
Min
Typ
Max
Units
Input Characteristics
Maximum Input Current
15 ADC, 1.0 VDC Out @ 36 VDC In
0.52
ADC
Input Stand-by Current
Vin = 48V, converter disabled
3
mADC
Input No Load Current (0 load on
the output)
Vin = 48V, converter enabled
22
mADC
Input Reflected-Ripple Current
25MHz bandwidth
7.5
mAPK-PK
Input Voltage Ripple Rejection
120HZ
TBD
dB
Output Characteristics
Output Voltage Set Point (no load)
0.990
1.000
1.010
VDC
Output Regulation
Over Line
±1
±2
mV
Over Load
±1
±3
mV
Output Voltage Range
Over line, load and temperature1
0.985
1.015
VDC
Output Ripple and Noise - 25 MHz
bandwidth
Full load + 10 μF tantalum + 1 μF ceramic
30
50
mVPK-PK
External Load Capacitance
Plus full load (resistive)
15,000
μF
Output Current Range
0
15
ADC
Current Limit Inception
Non-latching
15.75
18
20
ADC
Peak Short-Circuit Current
Non-latching, Short =10 mΩ.
30
40
A
RMS Short-Circuit Current
Non-latching
5.3
Arms
Dynamic Response
Load Change 25% of Iout Max,
di/dt = 0.1 A/μs
Co = 1 μF ceramic
90
mV
di/dt = 5 A/μs
Co = 450 μF tantalum + 1 μF ceramic
140
mV
Settling Time to 1%
100
μs
Efficiency
100% Load
80.5
%
50% Load
81.0
%
1-40 ºC to 85 ºC.
Fig. 1.0V.1: Available load current vs. ambient air Fig. 1.0V.2: Available load current vs. ambient air
temperature and airflow rates for SQ48T15010 converter temperature and airflow rates for SQ48T15010 converter
with D height pins mounted vertically with Vin = 48 V, air with D height pins mounted horizontally with Vin = 48 V,
flowing from pin 3 to pin 1, and maximum FET air flowing from pin 3 to pin 1, and maximum FET
temperature ≤ 120 ° C. temperature ≤ 120 °C.
© 2015 Bel Power Solutions, inc.
866.513.2839
tech.support@psbel.com
belpowersolutions.com
BCD.00637_AA
Fig. 1.0V.3: Available load current vs. ambient air Fig. 1.0V.4: Available load current vs. ambient air
temperature and airflow rates for SQ48S15010 converter temperature and airflow rates for SQ48S15010 converter
mounted vertically with Vin = 48 V, air flowing from pin 3 mounted horizontally with Vin = 48 V, air flowing from pin
to pin 1, and maximum FET temperature ≤ 120 ° C. 3 to pin 1, and maximum FET temperature ≤ 120 °C.
Fig. 1.0V.5: Efficiency vs. load current and input voltage for Fig. 1.0V.6: Efficiency vs. load current and ambient
SQ48T/S15010 converter mounted vertically with air temperature for SQ48T/S15010 converter mounted
flowing from pin 3 to pin 1 at a rate of 300 LFM (1.5 m/s) vertically with Vin = 48 V and air flowing from pin 3 to pin
and Ta = 25 °C. 1 at a rate of 200 LFM (1.0 m/s).
© 2015 Bel Power Solutions, inc.
866.513.2839
tech.support@psbel.com
belpowersolutions.com
BCD.00637_AA
Fig. 1.0V.7: Power dissipation vs. load current and Fig. 1.0V.8: Power dissipation vs. load current and
input voltage for SQ48T/S15010 converter mounted ambient temperature for SQ48T/S15010 converter
vertically with air flowing from pin 3 to pin 1 at a rate of mounted vertically with Vin = 48 V and air flowing from
300 LFM (1.5 m/s) and Ta = 25 ° C. pin 3 to pin 1 at a rate of 200 LFM (1.0 m/s).
Fig. 1.0V.9: Turn-on transient at full rated load current Fig. 1.0V.10: Turn-on transient at full rated load
(resistive) with no output capacitor at Vin = 48 V, current (resistive) plus 10,000 μF at Vin = 48 V,
triggered via ON/OFF pin. Top trace: ON/OFF signal triggered via ON/OFF pin. Top trace: ON/OFF signal
(5 V/div.). Bottom trace: output voltage (0.5 V/div.). Time (5 V/div.). Bottom trace: output voltage (0.5 V/div.)
scale: 2 ms/div. Time scale: 2 ms/div.
© 2015 Bel Power Solutions, inc.
866.513.2839
tech.support@psbel.com
belpowersolutions.com
BCD.00637_AA
Fig. 1.0V.11: Output voltage response to load current Fig. 1.0V.12: Output voltage response to load current
step-change (3.75 A – 7.5 A – 3.75 A) at Vin = 48 V. step-change (3.75 A – 7.5 A – 3.75 A) at Vin = 48 V.
Top trace: output voltage (100 mV/div.). Bottom trace: Top trace: output voltage (100 mV/div.). Bottom trace:
load current (5 A/div.). Current slew rate: 0.1 A/μs. load current (5 A/div.). Current slew rate: 5 A/μs. Co =
Co = 1 μF ceramic. Time scale: 0.2 ms/div. 450 μF tantalum + 1 μF ceramic. Time scale: 0.2 ms/div.
Fig. 1.0V.13: Output voltage ripple (20 mV/div.) at full Fig. 1.0V.14: Test Setup for measuring input reflected
rated load current into a resistive load with Co = 10 μF ripple currents, ic and is
tantalum + 1 μF ceramic and Vin = 48 V. Time scale: 1 μs/div.
© 2015 Bel Power Solutions, inc.
866.513.2839
tech.support@psbel.com
belpowersolutions.com
BCD.00637_AA
Fig. 1.0V.15: Input reflected ripple current, ic Fig. 1.0V.16: Input reflected ripple current, is
(100 mA/div.), measured at input terminals at full rated (10 mA/div.), measured through 10 μH at the source at
load current and Vin = 48 V. Refer to Fig. 1.0V.14 for full rated load current and Vin = 48 V. Refer to
test setup. Time scale: 1 μs/div. Fig. 1.0V.14 for test setup. Time scale: 1 μs/div.
Fig. 1.0V.17: Output voltage vs. load current showing Fig. 1.0V.18: Load current (top trace, 20 A/div.,
current limit point and converter shutdown point. Input 20 ms/div.) into a 10 mΩ short circuit during restart, at
voltage has almost no effect on current limit Vin = 48 V. Bottom trace (20 A/div., 1 ms/div.) is an
characteristic. expansion of the on-time portion of the top trace.
© 2015 Bel Power Solutions, inc.
866.513.2839
tech.support@psbel.com
belpowersolutions.com
BCD.00637_AA
Product
Series
Input
Voltage
Mounting
Scheme
Rated Load
Current
Output Voltage
ON/OFF
Logic
Maximum
Height [HT]
Pin Length
[PL]
Special Features
Environmental
SQ
48
T
15
012
-
N
B
A
0
One-
Eighth
Brick
Format
36-75 V
S
Surface
Mount
T
Through-
hole
15 15 A (1.0 –
3.3 V)
10 10 A (5.0 V)
08 8 A (6.0 V)
05 5.3 A (8.0 V)
04 4 A (12.0 V)
010 1.0 V
012 ⇒ 1.2 V
015 ⇒ 1.5 V
018 ⇒ 1.8 V
020 ⇒ 2.0 V
025 ⇒ 2.5 V
033 ⇒ 3.3 V
050 ⇒ 5.0 V
060 ⇒ 6.0 V
080 ⇒ 8.0 V
120 ⇒ 12.0 V
N
Negative
P
Positive
SMT
S ⇒ 0.273”
Through
hole
A ⇒ 0.303”
B ⇒ 0.336”
C ⇒ 0.500”
D ⇒ 0.400”
E ⇒ 0.282”
SMT
0 ⇒ 0.00”
Through
hole
A ⇒ 0.188”
B ⇒ 0.145”
C ⇒ 0.110”
0 ⇒ STD
T ⇒
Alternative
Trim
Option
(For 1.2 V, 1.0 V
only)
No Suffix
RoHS
lead-solder-
exemption
compliant
G RoHS
compliant for
all six
substances
The example above describes P/N SQ48T15012-NBA0: 36-75 V input, through-hole mounting, 15 A @ 1.2 V output,
negative ON/OFF logic, a maximum height of 0.336”, a through the board pin length of 0.188”, standard trim equations, and
Eutectic Tin/Lead solder. Please consult factory for the complete list of available options.
NUCLEAR AND MEDICAL APPLICATIONS - Products are not designed or intended for use as critical components in life support systems, equipment used in
hazardous environments, or nuclear control systems.
TECHNICAL REVISIONS - The appearance of products, including safety agency certifications pictured on labels, may change depending on the date
manufactured. Specifications are subject to change without notice.
Height
Option
HT
(Max. Height)
CL
(Min. Clearance)
+0.000 [+0.00]
-0.038 [- 0.97]
+0.016 [+0.41]
-0.000 [- 0.00]
A
0.303 [7.69]
0.030 [0.77]
B
0.336 [8.53]
0.063 [1.60]
C
0.500 [12.70]
0.227 [5.77]
D
0.400 [10.16]
0.127 [3.23]
E
0.282 [7.16]
0.009 [0.23]
Pin Option
PL
Pin Length
± 0.005 [± 0.13]
A
0.188 [4.77]
B
0.145 [3.68]
C
0.110 [2.79]
Pad/Pin Connections
Pad/Pin #
Function
1
Vin (+)
2
ON/OFF
3
Vin (-)
4
Vout (-)
5
SENSE(-)
6
TRIM
7
SENSE(+)
8
Vout (+)
SQE48T Platform Notes
All dimensions are in inches [mm]
Pins 1-3 and 5-7 are Ø 0.040” [1.02] with Ø 0.078” [1.98]
shoulder
Pins 4 and 8 are Ø 0.062” [1.57]
without shoulder
Pin Material: Brass
Pin Finish: Tin / Lead over Nickel or Matte Tin over Nickel for
“G” version
Converter Weight: 0.53 oz [15 g]
SQE48S Platform Notes
All dimensions are in inches [mm]
Connector Material: Copper
Connector Finishe: Gold over Nickel
Converter Weight: 0.66 oz [18.5 g]
Recommended Surface-Mount Pads:
Min. 0.080” X 0.112” [2.03 x 2.84]
Max. 0.092” X 0.124” [2.34 x 3.15]
