Data Sheet
May 20, 2010
Austin MegaLynxTM SMT: Non-Isolated DC-DC Power Modules:
2.7Vdc – 4.0Vdc input; 0.8 to 2.0Vdc; 30A Output Current
* UL is a registered trademark of Underwriters Laboratories, Inc.
† CSA is a registered trademark of Canadian Standards Association.
‡ VDE is a trademark of Verband Deutscher Elektrotechniker e.V.
** ISO is a registered trademark of the International Organization of Standards
Document No: DS06-130 ver. 1.06
PDF No: ATM030A0X3-SR_ds.pdf
Features
Compliant to RoHS EU Directive 2002/95/EC
Compatible in a Pb-free or SnPb reflow
environment
Delivers up to 30A of output current
High efficiency – 92% @ 1.8V full load
(VIN=3.3Vdc)
Input voltage range from 2.7V to 4.0Vdc
Output voltage programmable from 0.8 to 2.0Vdc
Small size and low profile:
o 33.0 mm x 9.1 mm x 13.5 mm
o (1.30 in. x 0.36 in. x 0.53 in.)
Monotonic start-up into pre-biased output
Output voltage sequencing (EZ-SEQUENCE TM)
Remote On/Off
Remote Sense
Over current and Over temperature protection
Parallel operation with active current sharing
Wide operating temperature range (-40°C to 85°C)
UL* 60950 Recognized, CSA† C22.2 No. 60950-00
Certified, and VDE‡ 0805 (EN60950-1 3rd edition)
Licensed
ISO** 9001 and ISO 14001 certified manufacturing
facilities
Applications
Distributed power architectures
Intermediate bus voltage applications
Telecommunications equipment
Servers and storage applications
Networking equipment
Description
The Austin MegaLynx ATM series SMT power modules are non-isolated DC-DC converters in an industry standard
package that can deliver up to 30A of output current with a full load efficiency of 92% at 1.8Vdc output voltage (VIN =
3.3Vdc). These modules operate off an input voltage from 2.7 to 4.0Vdc and provide an output voltage that is
programmable from 0.8 to 2.0Vdc. They have a sequencing feature that enables designers to implement various
types of output voltage sequencing when powering multiple modules on the board. Additional features include
remote On/Off, adjustable output voltage, remote sense, over current, over temperature protection and active
current sharing between modules.
RoHS Compliant
Data Sheet
May 20, 2010
Austin MegaLynxTM SMT: Non-Isolated DC-DC Power Modules:
2.7 – 4.0Vdc input; 0.8 to 2.0Vdc Output; 30A output current
LINEAGE POWER 2
Absolute Maximum Ratings
Stresses in excess of the absolute maximum ratings can cause permanent damage to the device. These are absolute
stress ratings only, functional operation of the device is not implied at these or any other conditions in excess of those
given in the operations sections of the data sheet. Exposure to absolute maximum ratings for extended periods can
adversely affect the device reliability.
Parameter Device Symbol Min Max Unit
Input Voltage
Continuous All VIN -0.3 4.0 Vdc
Sequencing pin voltage All VsEQ -0.3 4.0 Vdc
Operating Ambient Temperature All TA -40 85 °C
(see Thermal Considerations section)
Storage Temperature All Tstg -55 125 °C
Electrical Specifications
Unless otherwise indicated, specifications apply over all operating input voltage, resistive load, and temperature
conditions.
Parameter Device Symbol Min Typ Max Unit
Operating Input Voltage All VIN 2.7 3.3 4.0 Vdc
Maximum Input Current
(VIN= VIN,min , VO= VO,set, IO=IO, max) All IIN,max 20 Adc
Inrush Transient All I2 t 1 A2 s
Input Reflected Ripple Current, peak-to-peak
(5Hz to 20MHz, 1μH source impedance; VIN=2.7V to 4.0V, IO=
IOmax ; See Figure 1)
All 100 mAp-p
Input Ripple Rejection (120Hz) All 50 dB
Data Sheet
May 20, 2010
Austin MegaLynxTM SMT: Non-Isolated DC-DC Power Modules:
2.7 – 4.0Vdc input; 0.8 to 2.0Vdc Output; 30A output current
LINEAGE POWER 3
Electrical Specifications (continued)
Parameter Device Symbol Min Typ Max Unit
Output Voltage Set-point All VO, set -1.5 ⎯ +1.5 % VO, set
(VIN=VIN,nom, IO=IO, nom, Tref=25°C)
Output Voltage
(Over all operating input voltage, resistive load,
and temperature conditions until end of life) All VO, set –3.0 ⎯ +3.0 % VO, set
Adjustment Range
Selected by an external resistor All 0.8 2.0 Vdc
Output Regulation
Line (VIN=VIN, min to VIN, max) All
⎯ ⎯ 0.1 % VO, set
Load (IO=IO, min to IO, max) All
⎯ ⎯ 0.4 % VO, set
Temperature (Tref=TA, min to TA, max) All
⎯ 0.5 1 % VO, set
Output Ripple and Noise on nominal output
(VIN=VIN, nom and IO=IO, min to IO, max
COUT = 0.1μF // 10 μF ceramic capacitors)
Peak-to-Peak (5Hz to 20MHz bandwidth) Vo ≤ 2.0V ⎯ 50 mVpk-pk
External Capacitance
ESR ≥ 1 mΩ All CO, max 0 ⎯ 2,000 μF
ESR ≥ 10 mΩ All CO, max 0 ⎯ 10,000 μF
Output Current Vo ≤ 3.63V Io 0 30 Adc
Output Current Limit Inception (Hiccup Mode) All IO, lim 104 140 160 % Iomax
Output Short-Circuit Current All IO, s/c ⎯ 3.5 ⎯ Adc
(VO≤250mV) ( Hiccup Mode )
Efficiency VO,set = 0.8dc η 83.5 %
VIN=VIN, nom, TA=25°C VO,set = 1.25Vdc η 87.9 %
IO=IO, max , VO= VO,set V
O,set = 1.8Vdc η 91.6 %
Switching Frequency, Fixed All fsw ⎯ 270 ⎯ kHz
Dynamic Load Response
(dIO/dt=5A/μs; VIN=VIN, nom; TA=25°C)
Load Change from Io= 50% to 100% of
IO,max; No external output capacitors
Peak Deviation All Vpk ⎯ 380 ⎯ mV
Settling Time (VO<10% peak deviation) All ts ⎯ 50 ⎯ μs
(dIO/dt=5A/μs; VIN=VIN, nom; TA=25°C)
Load Change from IO= 100% to 50%of IO, max:
No external output capacitors
Peak Deviation All Vpk ⎯ 380 ⎯ mV
Settling Time (VO<10% peak deviation) All ts ⎯ 50 ⎯ μs
Data Sheet
May 20, 2010
Austin MegaLynxTM SMT: Non-Isolated DC-DC Power Modules:
2.7 – 4.0Vdc input; 0.8 to 2.0Vdc Output; 30A output current
LINEAGE POWER 4
Electrical Specifications (continued)
Parameter Device Symbol Min Typ Max Unit
Dynamic Load Response
(dIO/dt=5A/μs; VIN=VIN, nom; TA=25°C)
Load Change from Io= 50% to 100% of Io,max;
2x150 μF polymer capacitor
Peak Deviation All Vpk ⎯ 350 ⎯ mV
Settling Time (VO<10% peak deviation) All ts ⎯ 40 ⎯ μs
(dIO/dt=5A/μs; VIN=VIN, nom; TA=25°C)
Load Change from Io= 100% to 50%of IO,max:
2x150 μF polymer capacitor
Peak Deviation All Vpk ⎯ 250 ⎯ mV
Settling Time (VO<10% peak deviation) All ts ⎯ 60 ⎯ μs
General Specifications
Parameter Min Typ Max Unit
Calculated MTBF (VO= 1.2Vdc, IO= 0.8IO, max, TA=40°C)
Per Telecordia Method 3,443,380 Hours
Weight ⎯ 6.2 (0.22) ⎯ g (oz.)
Data Sheet
May 20, 2010
Austin MegaLynxTM SMT: Non-Isolated DC-DC Power Modules:
2.7 – 4.0Vdc input; 0.8 to 2.0Vdc Output; 30A output current
LINEAGE POWER 5
Feature Specifications
Unless otherwise indicated, specifications apply over all operating input voltage, resistive load, and temperature
conditions. See Feature Descriptions for additional information.
Parameter Device Symbol Min Typ Max Unit
On/Off Signal Interface
(VIN=VIN, min to VIN, max ; open collector or equivalent,
Signal referenced to GND)
Logic High (Module OFF)
Input High Current All IIH 0.5 ⎯ 3.3 mA
Input High Voltage All VIH 2.5 ⎯ VIN, max V
Logic Low (Module ON)
Input Low Current All IIL ⎯ ⎯ 200 µA
Input Low Voltage All VIL -0.3 ⎯ 1.2 V
Turn-On Delay and Rise Times
(VIN=VIN, nom, IO=IO, max , VO to within ±1% of steady state)
Case 1: On/Off input is enabled and then
input power is applied (delay from instant at
which VIN = VIN, min until Vo = 10% of Vo, set)
All Tdelay ― 2.5 5 msec
Case 2: Input power is applied for at least one second and
then the On/Off input is enabled (delay from instant at which
Von/Off is enabled until Vo = 10% of Vo, set)
All Tdelay ― 2.5 5 msec
Output voltage Rise time (time for Vo to rise from
10% of Vo, set to 90% of Vo, set)
All Trise 2 10 msec
Output voltage overshoot 3.0 % VO, set
IO = IO, max; VIN, min – VIN, max, TA = 25 oC
Remote Sense Range All ⎯ ⎯ 0.5 V
Over temperature Protection All Tref ⎯ 125 ⎯ °C
(See Thermal Consideration section)
Sequencing Slew rate capability All dVSEQ/dt — 2 V/msec
(VIN, min to VIN, max; IO, min to IO, max VSEQ < Vo)
Sequencing Delay time (Delay from VIN, min
to application of voltage on SEQ pin) All TsEQ-delay 10 msec
Tracking Accuracy Power-up (2V/ms) All VSEQ –Vo 100 200 mV
Power-down (1V/ms) VSEQ –Vo 200 400 mV
(VIN, min to VIN, max; IO, min - IO, max VSEQ < Vo)
Input Undervoltage Lockout
Turn-on Threshold All 2.2 Vdc
Turn-off Threshold All 1.7 Vdc
Forced Load Share Accuracy -P ⎯ 10 % Io
Number of units in Parallel -P 5
Data Sheet
May 20, 2010
Austin MegaLynxTM SMT: Non-Isolated DC-DC Power Modules:
2.7 – 4.0Vdc input; 0.8 to 2.0Vdc Output; 30A output current
LINEAGE POWER 6
Characteristic Curves
The following figures provide typical characteristics for the ATM030A0X3-SR & -SRH (0.8V, 30A) at 25oC.
EFFICIENCY, η (%)
65
70
75
80
85
90
95
0 5 10 15 20 25 30
Vin = 3.0V
Vin = 3.3V Vin = 3.9V
OUTPUT CURRENT, Io (A)
0
5
10
15
20
25
30
35
30 40 50 60 70 80
NC 0.5m/s
100 LFM
1m/s
200 LFM
1.5m/s
300 LFM
2.0m/s
400 LFM
2.5m/s
500 LFM
OUTPUT CURRENT, IO (A) AMBIENT TEMPERATURE, TA OC
Figure 1. Converter Efficiency versus Output Current. Figure 4. Derating Output Current versus Ambient
Temperature and Airflow (ATM030A0X3-SR).
OUTPUT VOLTAGE
VO (V) (20mV/div)
OUTPUT CURRENT, Io (A)
15
20
25
30
35
30 40 50 60 70 80
NC
0.5m/s (100LFM)
1m/s (200LFM)
1.5m/s (300LFM)
2m/s (400LFM)
2.5m/s (500LFM)
TIME, t (1μs/div) AMBIENT TEMPERATURE, TA OC
Figure 2. Typical output ripple and noise (VIN = VIN,NOM,
Io = Io,max).
Figure 5. Derating Output Current versus Ambient
Temperature and Airflow (ATM030A0X3-SRH).
OUTPUT CURRENT, OUTPUT VOLTAGE
IO (A) (5Adiv) VO (V) (200mV/div)
INPUT VOLTAGE OUTPUT VOLTAGE
VIN (V) (1V/div) VO (V) (1V/div)
TIME, t (50μs /div) TIME, t (5ms/div)
Figure 3. Transient Response to Dynamic Load Change
from 0% to 50% to 0% of full load.
Figure 6. Typical Start-up Using Input Voltage (VIN =
VIN,NOM, Io = Io,max).
Data Sheet
May 20, 2010
Austin MegaLynxTM SMT: Non-Isolated DC-DC Power Modules:
2.7 – 4.0Vdc input; 0.8 to 2.0Vdc Output; 30A output current
Tyco Electronics Power Systems 7
Characteristic Curves
The following figures provide typical characteristics for the ATM030A0X3-SR and -SRH (1.25V, 30A) at 25oC.
EFFICIENCY, η (%)
65
70
75
80
85
90
95
0 5 10 15 20 25 30
Vin = 3.0V
Vin = 3.3V Vin = 3.9V
OUTPUT CURRENT, Io (A)
0
5
10
15
20
25
30
35
30 40 50 60 70 80
NC 0.5m/s
100 LFM
1m/s
200 LFM
1.5m/s
300 LFM
2.0m/s
400 LFM
2.5m/s
500 LFM
OUTPUT CURRENT, IO (A) AMBIENT TEMPERATURE, TA
O
C
Figure 7. Converter Efficiency versus Output Current. Figure 10. Derating Output Current versus Ambient
Temperature and Airflow (ATM030A0X3-SR).
OUTPUT VOLTAGE
VO (V) (20mV/div)
OUTPUT CURRENT, Io (A)
20
25
30
35
30 40 50 60 70 80
NC
0.5m/s
(
100LFM
)
1m/s
(
200LFM
)
1.5m/s
(
300LFM
)
2m/s
(
400LFM
)
2.5m/s
(
500LFM
)
TIME, t (1μs/div) AMBIENT TEMPERATURE, TA
O
C
Figure 8. Typical output ripple and noise (VIN = VIN,NOM,
Io = Io,max).
Figure 11. Derating Output Current versus Ambient
Temperature and Airflow (ATM030A0X3-SRH).
OUTPUT CURRENT, OUTPUT VOLTAGE
IO (A) (5Adiv) VO (V) (200mV/div)
INPUT VOLTAGE OUTPUT VOLTAGE
VIN (V) (1V/div) VO (V) (1V/div)
TIME, t (50μs /div) TIME, t (5ms/div)
Figure 9. Transient Response to Dynamic Load Change
from 0% to 50% to 0% of full load.
Figure 12. Typical Start-up Using Input Voltage (VIN =
VIN,NOM, Io = Io,max).
Data Sheet
May 20, 2010
Austin MegaLynxTM SMT: Non-Isolated DC-DC Power Modules:
2.7 – 4.0Vdc input; 0.8 to 2.0Vdc Output; 30A output current
LINEAGE POWER 8
Characteristic Curves
The following figures provide typical characteristics for the ATM030A0X3-SR and –SRH (1.8V, 30A) at 25oC.
EFFICIENCY, η (%)
70
75
80
85
90
95
100
0 5 10 15 20 25 30
Vin = 3.0V
Vin = 3.3V Vin = 3.9V
OUTPUT CURRENT, Io (A)
0
5
10
15
20
25
30
35
30 40 50 60 70 80
NC 0.5m/s
100 LFM
1m/s
200 LFM
1.5m/s
300 LFM
2.0m/s
400 LFM
2.5m/s
500 LFM
OUTPUT CURRENT, IO (A) AMBIENT TEMPERATURE, TA OC
Figure 13. Converter Efficiency versus Output
Current.
Figure 16. Output Current Derating versus Ambient
Temperature and Airflow (ATM030A0X3-SR).
OUTPUT VOLTAGE
VO (V) (20mV/div)
OUTPUT CURRENT, Io (A)
15
20
25
30
35
30 40 50 60 70 80
NC
0.5m/s (100LFM)
1m/s
(
200LFM
)
1.5m/s
(
300LFM
)
2m/s
(
400LFM
)
2.5m/s
(
500LFM
)
TIME, t (1μs/div) AMBIENT TEMPERATURE, TA OC
Figure 14. Typical output ripple and noise (VIN =
VIN,NOM, Io = Io,max).
Figure 17. Output Current Derating versus Ambient
Temperature and Airflow (ATM030A0X3-SRH).
OUTPUT
CURRENT
,
OUTPUT
VOLTAGE
IO (A) (5A/div) VO (V) (200mV/div)
INPUT VOLTAGE OUTPUT VOLTAGE
VIN (V) (1V/div) VO (V) (1V/div)
TIME, t (50μs /div) TIME, t (5ms/div)
Figure 15. Transient Response to Dynamic Load
Change from 0% to 50% to 0% of full load.
Figure 18. Typical Start-up Using Input Voltage (VIN =
VIN,NOM, Io = Io,max).
Data Sheet
May 20, 2010
Austin MegaLynxTM SMT: Non-Isolated DC-DC Power Modules:
2.7 – 4.0Vdc input; 0.8 to 2.0Vdc Output; 30A output current
Tyco Electronics Power Systems 9
Characteristic Curves
The following figures provide typical characteristics for the ATM030A0X3-SR and -SRH (2.0V, 30A) at 25oC.
EFFICIENCY, η (%)
70
75
80
85
90
95
100
0 5 10 15 20 25 30
Vin = 3.0V
Vin = 3.3V Vin = 3.9V
OUTPUT CURRENT, Io (A)
0
5
10
15
20
25
30
3
5
30 40 50 60 70 80
NC 0.5m/s
100 LFM
1m/s
200 LFM
1.5m/s
300 LFM
2.0m/s
400 LFM
2.5m/s
500 LFM
OUTPUT CURRENT, IO (A) AMBIENT TEMPERATURE, TA OC
Figure 19. Converter Efficiency versus Output
Current.
Figure 22. Output Current Derating versus Ambient
Temperature and Airflow (ATM030A0X3-SR).
OUTPUT VOLTAGE
VO (V) (20mV/div)
OUTPUT CURRENT, Io (A)
15
20
25
30
35
30 40 50 60 70 80
NC
0.5m/s
(
100LFM
)
1m/s
(
200LFM
)
1.5m/s
(
300LFM
)
2m/s
(
400LFM
)
2.5m/s
(
500LFM
)
TIME, t (1μs/div) AMBIENT TEMPERATURE, TA OC
Figure 20. Typical output ripple and noise (VIN =
VIN,NOM, Io = Io,max).
Figure 23. Output Current Derating versus Ambient
Temperature and Airflow (ATM030A0X3-SRH).
OUTPUT
CURRENT
,
OUTPUT
VOLTAGE
IO (A) (5A/div) VO (V) (200mV/div)
INPUT VOLTAGE OUTPUT VOLTAGE
VIN (V) (1V/div) VO (V) (1V/div)
TIME, t (50μs /div) TIME, t (5ms/div)
Figure 21. Transient Response to Dynamic Load
Change from 0% to 50% to 0% of full load.
Figure 24. Typical Start-up Using Input Voltage (VIN =
VIN,NOM, Io = Io,max).
Data Sheet
May 20, 2010
Austin MegaLynxTM SMT: Non-Isolated DC-DC Power Modules:
2.7 – 4.0Vdc input; 0.8 to 2.0Vdc Output; 30A output current
LINEAGE POWER 10
Test Configurations
TO OSCILLOSCOPE CURRENT PROBE
LTEST
1μH
BATTERY
CS 220μF
E.S.R.<0.1Ω
@ 20°C 100kHz
Min
150μF
VIN(+)
COM
NOTE: Measure input reflected ripple current with a simulated
source inductance (LTES T) of 1μH. Capacitor CS offsets
possible battery impedance. Measure current as shown
above.
CIN
Figure 25. Input Reflected Ripple Current Test
Setup.
NOTE: All voltage measurements to be taken at the module
terminals, as shown above. If sockets are used then
Kelvin connections are required at the module terminals
to avoid measurement errors due to socket contact
resistance.
V
O
(+)
COM
1uF .
RESISTIVE
LOAD
SCOPE
COPPER STRIP
GROUND PLANE
10uF
Figure 26. Output Ripple and Noise Test Setup.
VO
COM
VIN(+)
COM
RLOAD
Rcontac t Rdistribution
Rcontac t Rdistribution
Rcontact
Rcontact
Rdistribution
Rdistribution
VIN VO
NOTE: All voltage measurements to be taken at the module
terminals, as shown above. If sockets are used then
Kelvin connections are required at the module terminals
to avoid measurement errors due to socket contact
resistance.
Figure 27. Output Voltage and Efficiency Test
Setup.
η =
VO. IO
VIN. IIN
x 100 %
Efficiency
Design Considerations
The ATM030 module should be connected to a low-
impedance source. A highly inductive source can
affect the stability of the module. An input capacitor
must be placed directly adjacent to the input pin of
the module, to minimize input ripple voltage and
ensure module stability.
To minimize input voltage ripple, low-ESR ceramic
capacitors are recommended at the input of the
module. Figure 28 shows the input ripple voltage for
various output voltages at 30A of load current with
1x47 µF or 2x47 µF ceramic capacitors and an
input of 3.3V.
In
p
ut Ri
pp
le Volta
g
e
(
mV
p
-
p)
40
50
60
70
80
90
100
0.5 1 1.5 2
1 x 47u
2 x 47u
Output Voltage (Vdc)
Figure 28. Input ripple voltage for various
output voltages with 1x47 µF or 2x47 µF ceramic
capacitors at the input (30A load). Input voltage
is 3.3V.
Safety Considerations
For safety agency approval the power module must
be installed in compliance with the spacing and
separation requirements of the end-use safety
agency standards, i.e., UL 60950, CSA C22.2 No.
60950-00, EN60950 (VDE 0850) (IEC60950, 3rd
edition) Licensed.
For the converter output to be considered meeting
the requirements of safety extra-low voltage
(SELV), the input must meet SELV requirements.
The power module has extra-low voltage (ELV)
outputs when all inputs are ELV.
An input fuse for the module is recommended. As
an option to using a fuse, no fuse is required, if the
module is powered by a power source with current
limit protection and the module is evaluated in the
end-use equipment.
Data Sheet
May 20, 2010
Austin MegaLynxTM SMT: Non-Isolated DC-DC Power Modules:
2.7 – 4.0Vdc input; 0.8 to 2.0Vdc Output; 30A output current
Tyco Electronics Power Systems 11
Feature Descriptions
Remote On/Off
The ATM030 SMT power modules feature a On/Off
pin for remote On/Off operation. If not using the
On/Off pin, connect the pin to ground (the module
will be ON). The On/Off signal (Von/off) is referenced
to ground. Circuit configuration for remote On/Off
operation of the module using the On/Off pin is
shown in Figure 29.
During a Logic High on the On/Off pin (transistor Q1
is OFF), the module remains OFF. The external
resistor RX should be chosen to maintain 2.5V
minimum on the On/Off pin to ensure that the
module is OFF when transistor Qx is in the OFF
state. A suitable values for RX is 3K for 5Vin.
During Logic-Low when QX is turned ON, the
module is turned ON.
Q1
GND
PWM Enable
ON/OFF
VIN+
ON/OFF
_
+
V
I
MOD UL E
R1
ON/OFF
100K
Therm al SD
1K
10K
Figure 29. Remote On/Off Implementation
using ON/OFF .
The On/Off pin can also be used to synchronize the
output voltage start-up and shutdown of multiple
modules in parallel. By connecting On/Off pins of
multiple modules, the output start-up can be
synchronized (please refer to characterization
curves). When On/Off pins are connected together,
all modules will shutdown if any one of the modules
gets disabled due to undervoltage lockout or over
temperature protection.
Remote Sense
The ATM030 power modules have a Remote Sense
feature to minimize the effects of distribution losses
by regulating the voltage at the Remote Sense pin
(See Figure 30). The voltage between the Sense
pin and Vo pin must not exceed 0.5V.
The amount of power delivered by the module is
defined as the output voltage multiplied by the
output current (Vo x Io). When using Remote
Sense, the output voltage of the module can
increase, which if the same output is maintained,
increases the power output by the module. Make
sure that the maximum output power of the module
remains at or below the maximum rated power.
When the Remote Sense feature is not being used,
connect the Remote Sense pin to output of the
module.
VO
COM
VIN(+ )
COM
RLOAD
Rcontact Rdistribution
Rcontact Rdistribution
Rcontact
Rcontact
Rdistribution
Rdistribution
Sense
Figure 30. Effective Circuit Configuration for
Remote Sense operation.
Over Current Protection
To provide protection in a fault (output overload)
condition, the unit is equipped with internal
current-limiting circuitry and can endure current
limiting continuously. At the point of current-limit
inception, the unit enters hiccup mode. The unit
operates normally once the output current is
brought back into its specified range. The average
output current during hiccup is 10% IO, max.
Over Temperature Protection
To provide protection in a fault condition, the unit is
equipped with a thermal shutdown circuit. The unit
will shutdown if the overtemperature threshold of
125oC is exceeded at the thermal reference point
Tref. The thermal shutdown is not intended as a
guarantee that the unit will survive temperatures
beyond its rating. Once the unit goes into thermal
shutdown it will then wait to cool before attempting
to restart.
Input Under Voltage Lockout
At input voltages below the input undervoltage
lockout limit, the module operation is disabled. The
module will begin to operate at an input voltage
above the undervoltage lockout turn-on threshold.
Data Sheet
May 20, 2010
Austin MegaLynxTM SMT: Non-Isolated DC-DC Power Modules:
2.7 – 4.0Vdc input; 0.8 to 2.0Vdc Output; 30A output current
LINEAGE POWER 12
Output Voltage Programming
The output voltage of the ATM030 module can be
programmed to any voltage from 0.8dc to 2.0Vdc by
connecting a resistor (shown as Rtrim in Figure 31)
between Trim and GND pins of the module.
Without an external resistor between Trim and GND
pins, the output of the module will be 0.8Vdc. To
calculate the value of the trim resistor, Rtrim for a
desired output voltage, use the following equation:
Ω
−
−
=100
80.0
1200
Vo
Rtrim
Rtrim is the external resistor in Ω
Vo is the desired output voltage
By using a ±0.5% tolerance trim resistor with a TC
of ±100ppm, a set point tolerance of ±1.5% can be
achieved as specified in the electrical specification.
The POL Programming Tool, available at
www.lineagepower.com under the Design Tools
section, helps determine the required external trim
resistor needed for a specific output voltage.
V
O
(+)
TRIM
GND
LOAD
V
IN
(+)
ON/OFF
Rtrim
Figure 31. Circuit configuration to program
output voltage using an external resistor.
Voltage Margining
Output voltage margining can be implemented in
the Austin MegaLynxTM modules by connecting a
resistor, Rmargin-up, from the Trim pin to the ground
pin for margining-up the output voltage and by
connecting a resistor, Rmargin-down, from the Trim pin
to output pin for margining-down. Figure 32 shows
the circuit configuration for output voltage
margining. The POL Programming Tool, available
at www.lineagepower.com under the Design Tools
section, also calculates the values of Rmargin-up and
Rmargin-down for a specific output voltage and %
margin. Please consult your local Lineage Power
technical representative for additional details.
Voltage Sequencing
The Austin MegaLynxTM series of modules include a
sequencing feature that enables users to implement
various types of output voltage sequencing in their
applications. This is accomplished via an additional
sequencing pin. When not using the sequencing
feature, either leave the SEQ pin unconnected or
tied to VIN.
Vo
Austin Lynx or
Lynx II Series
GND
Trim
Q1
Rtrim
Rmargin-up
Q2
Rmargin-down
Figure 32. Circuit Configuration for margining
Output voltage.
For proper voltage sequencing, first, input voltage is
applied to the module. The On/Off pin of the
module is or tied to GND so that the module is ON
by default. After applying input voltage to the
module, a minimum of 10msec delay is required
before applying voltage on the SEQ pin. After
10msec delay, an analog voltage is applied to the
SEQ pin and the output voltage of the module will
track this voltage on a one-to-one volt bases until
output reaches the set-point voltage. To initiate
simultaneous shutdown of the modules, the SEQ
pin voltage is lowered in a controlled manner.
Output voltage of the modules tracks the voltages
below their set-point voltages on a one-to-one
basis. A valid input voltage must be maintained
until the tracking and output voltages reach ground
potential.
When using the EZ-SEQUENCETM feature to
control start-up of the module, pre-bias immunity
feature during start-up is disabled. The pre-bias
immunity feature of the module relies on the module
being in the diode-mode during start-up. When
using the EZ-SEQUENCETM feature, modules goes
through an internal set-up time of 10msec, and will
be in synchronous rectification mode when voltage
Data Sheet
May 20, 2010
Austin MegaLynxTM SMT: Non-Isolated DC-DC Power Modules:
2.7 – 4.0Vdc input; 0.8 to 2.0Vdc Output; 30A output current
Tyco Electronics Power Systems 13
at the SEQ pin is applied. This will result in sinking
current in the module if pre-bias voltage is present
at the output of the module. When pre-bias
immunity during start-up is required, the EZ-
SEQUENCETM feature must be disabled. For
additional guidelines on using EZ-SEQUENCETM
feature of Austin MegaLynx modules, contact the
Tyco Power Systems Technical representative for
the application note on output voltage sequencing.
Active Load Sharing (-P Option)
For additional power requirements, the ATM030
series power module is also available with a parallel
option. Up to five modules can be configured, in
parallel, with active load sharing. Good layout
techniques should be observed when using multiple
units in parallel. To implement forced load sharing,
the following connections should be made:
• The share pins of all units in parallel must be
connected together. The path of these
connections should be as direct as possible.
• All remote-sense pins should be connected to
the power bus at the same point, i.e., connect
all the SENSE(+) pins to the (+) side of the bus.
Close proximity and directness are necessary
for good noise immunity
Some special considerations apply for design of
converters in parallel operation:
When sizing the number of modules required for
parallel operation, take note of the fact that current
sharing has some tolerance. In addition, under
transient condtions such as a dynamic load change
and during startup, all converter output currents will
not be equal. To allow for such variation and avoid
the likelihood of a converter shutting off due to a
current overload, the total capacity of the paralleled
system should be no more than 75% of the sum of
the individual converters. As an example, for a
system of four ATM030A0X3-SR converters the
parallel, the total current drawn should be less that
75% of 4 x 30A or 90A.
• When sizing the number of modules required
for parallel operation, take note of the fact that
current sharing has some tolerance. In
addition, under transient condtions such as a
dynamic load change and during startup, all
converter output currents will not be equal. To
allow for such variation and avoid the likelihood
of a converter shutting off due to a current
overload, the total capacity of the paralleled
system should be no more than 75% of the
sum of the individual converters. As an
example, for a system of four ATM030A0X3-
SR converters the parallel, the total current
drawn should be less that 75% of (4 x 30A) ,
i.e. less than 90A.
• All modules should be turned on and off
together. This is so that all modules come up at
the same time avoiding the problem of one
converter sourcing current into the other
leading to an overcurrent trip condition. To
ensure that all modules come up
simultaneously, the on/off pins of all paralleled
converters should be tied together and the
converters enabled and disabled using the
on/off pin.
• The share bus is not designed for redundant
operation and the system will be non-functional
upon failure of one of the unit when multiple
units are in parallel. In particular, if one of the
converters shuts down during operation, the
other converters may also shut down due to
their outputs hitting current limit. In such a
situation, unless a coordinated restart is
ensured, the system may never properly restart
since different converters will try to restart at
different times causing an overload condition
and subsequent shutdown. This situation can
be avoided by having an external output
voltage monitor circuit that detects a shutdown
condition and forces all converters to shut
down and restart together.
When not using the parallel feature, leave the share
pin open.
Data Sheet
May 20, 2010
Austin MegaLynxTM SMT: Non-Isolated DC-DC Power Modules:
2.7 – 4.0Vdc input; 0.8 to 2.0Vdc Output; 30A output current
LINEAGE POWER 14
Thermal Considerations
Power modules operate in a variety of thermal
environments; however, sufficient cooling should
always be provided to help ensure reliable
operation.
Considerations include ambient temperature,
airflow, module power dissipation, and the need for
increased reliability. A reduction in the operating
temperature of the module will result in an increase
in reliability. The thermal data presented here is
based on physical measurements taken in a wind
tunnel. The test set-up is shown in Figure 33. Note
that the airflow is parallel to the long axis of the
module as shown in Figure 34. The derating data
applies to airflow in either direction of the module’s
long axis.
Figure 33. Thermal Test Up
Figure 34. Airflow direction for thermal testing.
Figure 35. Tref Temperature measurement
location.
The thermal reference points, Tref used in the
specifications are shown in Figure 35. For reliable
operation the temperatures at these points should
not exceed 125oC. The output power of the module
should not exceed the rated power of the module
(Vo,set x Io,max).
Please refer to the Application Note “Thermal
Characterization Process For Open-Frame Board-
Mounted Power Modules” for a detailed discussion
of thermal aspects including maximum device
temperatures.
A
i
r
flow
x
Power Module
W
ind Tunnel
PWBs
12.7_
(0.50)
76.2_
(3.0)
Probe Location
for measuring
airflow and
ambient
temperature
25.4_
(1.0)
Data Sheet
May 20, 2010
Austin MegaLynxTM SMT: Non-Isolated DC-DC Power Modules:
2.7 – 4.0Vdc input; 0.8 to 2.0Vdc Output; 30A output current
Tyco Electronics Power Systems 15
Mechanical Outline of Module (ATM030A0X3-SRPH)
Dimensions are in millimeters and (inches).
Tolerances: x.x mm ± 0.5 mm (x.xx in. ± 0.02 in.) [unless otherwise indicated]
x.xx mm ± 0.25 mm (x.xxx in ± 0.010 in.)
Note: For the ATM030A0X3-SRH module, the SHARE pin is omitted since these modules are not
capable of being paralleled.
Data Sheet
May 20, 2010
Austin MegaLynxTM SMT: Non-Isolated DC-DC Power Modules:
2.7 – 4.0Vdc input; 0.8 to 2.0Vdc Output; 30A output current
LINEAGE POWER 16
Recommended Pad Layout (ATM030A0X3-SRPH)
Dimensions are in millimeters and (inches).
Tolerances: x.x mm ± 0.5 mm (x.xx in. ± 0.02 in.) [unless otherwise indicated]
x.xx mm ± 0.25 mm (x.xxx in ± 0.010 in.)
Note: For the ATM030A0X3-SRH module, the SHARE pin is not present since these modules are not
capable of being paralleled.
PIN FUNCTION PIN FUNCTION
1 On/Off 6 Trim
2 VIN 7 Sense
3 SEQ 8 GND
4 GND 9 SHARE
5 VOUT 10 GND
Pin 8
Pin 10
Data Sheet
May 20, 2010
Austin MegaLynxTM SMT: Non-Isolated DC-DC Power Modules:
2.7 – 4.0Vdc input; 0.8 to 2.0Vdc Output; 30A output current
Tyco Electronics Power Systems 17
Mechanical Outline of Module (ATM030A0X3-SRP)
Dimensions are in millimeters and (inches).
Tolerances: x.x mm ± 0.5 mm (x.xx in. ± 0.02 in.) [unless otherwise indicated]
x.xx mm ± 0.25 mm (x.xxx in ± 0.010 in.)
Note: For the ATM030A0X3-SR module, the SHARE pin is omitted since these modules are not capable
of being paralleled.
Data Sheet
May 20, 2010
Austin MegaLynxTM SMT: Non-Isolated DC-DC Power Modules:
2.7 – 4.0Vdc input; 0.8 to 2.0Vdc Output; 30A output current
LINEAGE POWER 18
Recommended Pad Layout (ATM030A0X3-SRP)
Dimensions are in millimeters and (inches).
Tolerances: x.x mm ± 0.5 mm (x.xx in. ± 0.02 in.) [unless otherwise indicated]
x.xx mm ± 0.25 mm (x.xxx in ± 0.010 in.)
Note: For the ATM030A0X3-SR module, the SHARE pin is not used since these modules are not
capable of being paralleled.
PIN FUNCTION PIN FUNCTION
1 On/Off 6 Trim
2 VIN 7 Sense
3 SEQ 8 No Pin
4 GND 9 Share
5 VOUT 10 No Pin
Data Sheet
May 20, 2010
Austin MegaLynxTM SMT: Non-Isolated DC-DC Power Modules:
2.7 – 4.0Vdc input; 0.8 to 2.0Vdc Output; 30A output current
Tyco Electronics Power Systems 19
Packaging Details
The ATM030 SMT module is supplied in tape & reel as standard. Modules are shipped in quantities of 200 modules
per reel.
All Dimensions are in millimeters and (in inches).
Reel Dimensions
Outside diameter: 330.2 (13.0)
Inside diameter: 177.8 (7.0)
Tape Width: 44.0 (1.73)
Data Sheet
May 20, 2010
Austin MegaLynxTM SMT: Non-Isolated DC-DC Power Modules:
2.7 – 4.0Vdc input; 0.8 to 2.0Vdc Output; 30A output current
LINEAGE POWER 20
Surface Mount Information
Pick and Place
The Austin MegaLynxTM SMT modules use an open
frame construction and are designed for a fully
automated assembly process. The modules are fitted
with a label designed to provide a large surface area
for pick and place operations. The label meets all the
requirements for surface mount processing, as well as
safety standards, and is able to withstand reflow
temperatures of up to 300oC. The label also carries
product information such as product code, serial
number and location of manufacture.
Figure 36. Pick and Place Location.
Nozzle Recommendations
The module weight has been kept to a minimum by
using open frame construction. Even so, these
modules have a relatively large mass when compared
to conventional SMT components. Variables such as
nozzle size, tip style, vacuum pressure and pick &
placement speed should be considered to optimize
this process. The minimum recommended inside
nozzle diameter for reliable operation is 3mm. The
maximum nozzle outer diameter, which will safely fit
within the allowable component spacing, is 5 mm
max.
Tin Lead Soldering
The ATM030 modules are lead free modules and can
be soldered either in a lead-free solder process or in a
conventional Tin/Lead (Sn/Pb) process. It is
recommended that the customer review data sheets
in order to customize the solder reflow profile for each
application board assembly. The following
instructions must be observed when soldering these
units. Failure to observe these instructions may result
in the failure of or cause damage to the modules, and
can adversely affect long-term reliability.
In a conventional Tin/Lead (Sn/Pb) solder process
peak reflow temperatures are limited to less than
235oC. Typically, the eutectic solder melts at 183oC,
wets the land, and subsequently wicks the device
connection. Sufficient time must be allowed to fuse
the plating on the connection to ensure a reliable
solder joint. There are several types of SMT reflow
technologies currently used in the industry. These
surface mount power modules can be reliably
soldered using natural forced convection, IR (radiant
infrared), or a combination of convection/IR. For
reliable soldering the solder reflow profile should be
established by accurately measuring the modules CP
connector temperatures.
REFLOW TEMP (°C)
0
50
10 0
15 0
200
250
300
Preheat zone
max 4
o
Cs
-1
So ak zone
30-240s
Heat zone
max 4
o
Cs
-1
Peak Temp 235
o
C
Cooling
zo ne
1- 4
o
Cs
-1
T
lim
above
205
o
C
REFLOW TIME (S)
Figure 37. Reflow Profile for Tin/Lead (Sn/Pb)
process.
MAX TEMP SOLDER (°C)
200
205
210
215
220
225
230
235
240
0 102030405060
Figure 38. Time Limit Curve Above 205oC Reflow
for Tin Lead (Sn/Pb) process.
Data Sheet
May 20, 2010
Austin MegaLynxTM SMT: Non-Isolated DC-DC Power Modules:
2.7 – 4.0Vdc input; 0.8 to 2.0Vdc Output; 30A output current
Tyco Electronics Power Systems 21
Surface Mount Information (continued)
Lead Free Soldering
The –Z version MegaLynx ATM SMT modules are
lead-free (Pb-free) and RoHS compliant and are both
forward and backward compatible in a Pb-free and a
SnPb soldering process. Failure to observe the
instructions below may result in the failure of or cause
damage to the modules and can adversely affect
long-term reliability.
Pb-free Reflow Profile
Power Systems will comply with J-STD-020 Rev. C
(Moisture/Reflow Sensitivity Classification for
Nonhermetic Solid State Surface Mount Devices) for
both Pb-free solder profiles and MSL classification
procedures. This standard provides a recommended
forced-air-convection reflow profile based on the
volume and thickness of the package (table 4-2). The
suggested Pb-free solder paste is Sn/Ag/Cu (SAC).
The recommended linear reflow profile using
Sn/Ag/Cu solder is shown in Figure 39.
MSL Rating
The Austin MegaLynxTM ATM SMT modules have a
MSL rating of 2.
Storage and Handling
The recommended storage environment and handling
procedures for moisture-sensitive surface mount
packages is detailed in J-STD-033 Rev. A (Handling,
Packing, Shipping and Use of Moisture/Reflow
Sensitive Surface Mount Devices). Moisture barrier
bags (MBB) with desiccant are required for MSL
ratings of 2 or greater. These sealed packages
should not be broken until time of use. Once the
original package is broken, the floor life of the product
at conditions of ≤ 30°C and 60% relative humidity
varies according to the MSL rating (see J-STD-033A).
The shelf life for dry packed SMT packages will be a
minimum of 12 months from the bag seal date, when
stored at the following conditions: < 40° C, < 90%
relative humidity.
Post Solder Cleaning and Drying
Considerations
Post solder cleaning is usually the final circuit-board
assembly process prior to electrical board testing. The
result of inadequate cleaning and drying can affect
both the reliability of a power module and the
testability of the finished circuit-board assembly. For
guidance on appropriate soldering, cleaning and
drying procedures, refer to Board Mounted Power
Modules: Soldering and Cleaning Application Note
(AN04-001).
Per J-STD-020 Rev. C
0
50
100
150
200
250
300
Reflow Time (Seconds)
Reflow Temp (°C)
Heating Zone
1°C/Second
Peak Temp 260°C
* Min. Time Above 235°C
15 Seconds
*Time Above 217°C
60 Seconds
Cooling
Zone
Figure 39. Recommended linear reflow profile
using Sn/Ag/Cu solder.
Data Sheet
May 20, 2010
Austin MegaLynxTM SMT: Non-Isolated DC-DC Power Modules:
2.7 – 4.0Vdc input; 0.8 to 2.0Vdc Output; 30A output current
LINEAGE POWER 22
Document No: DS06-130 ver. 1.06
PDF No: ATM030A0X3-SR_ds.pdf
Ordering Information
Please contact your Lineage Power Sales Representative for pricing, availability and optional features.
Table 1: Device Codes
Product codes Input
Voltage
Output
Voltage
Output
Current
On/Off
Logic
Connector
Type Comcodes
ATM030A0X3-SR 2.7 – 4.0Vdc 0.8 – 2.0Vdc 30A Negative SMT CC109112315
ATM030A0X3-SRZ 2.7 – 4.0Vdc 0.8 – 2.0Vdc 30A Negative SMT CC109112397
ATM030A0X3-SRH 2.7 – 4.0Vdc 0.8 – 2.0Vdc 30A Negative SMT CC109112323
ATM030A0X3-SRHZ 2.7 – 4.0Vdc 0.8 – 2.0Vdc 30A Negative SMT CC109112406
ATM030A0X3-SRPH 2.7 – 4.0Vdc 0.8 – 2.0Vdc 30A Negative SMT CC109112331
ATM030A0X3-SRPHZ 2.7 – 4.0Vdc 0.8 – 2.0Vdc 30A Negative SMT CC109112414
Table 2. Device Options
Option Device Code Suffix
Current Share -P
2 Extra ground pins -H
RoHS Compliant -Z
World Wide Headquarters
Lineage Power Corporation
601 Shiloh Road, Plano, TX 75074, USA
+1-800-526-7819
(Outside U.S.A.: +1-972-244-9428)
www.lineagepower.com
e-mail: techsupport1@lineagepower.com
Asia-Pacific Headquarters
Tel: +65 6593 7211
Europe, Middle-East and Africa Headquarters
Tel: +49 89 878067-280
India Headquarters
Tel: +91 80 28411633
Lineage Power reserves the right to make changes to the product(s) or information contained herein without notice. No liability is assumed as a result of their use or
a
pplication. No rights under any patent accompany the sale of any such product(s) or information.
Lineage Power DC-DC products are protected under various patents. Information on these patents is available at www.lineagepower.com/patents.
©
2009 Linea
g
e Power Cor
p
oration
,
(
Plano
,
Texas
)
All International Ri
g
hts Reserved.