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2.25-A, WIDE INPUT, ADJUSTABLE SWITCHING REGULATOR
FEATURES
APPLICATIONS
DESCRIPTION
1
5
2
3
4
6
+
+
PTH08000W
(Top View)
Track
GND
R #
1%, 0.05 W
(Required)
SET
Inhibit
C
100 F
(Required)
I*
µ
C
100 F
(Optional)
O*
µ
VI
VO
GND
STANDARD APPLICATION
* See the Application Information section for capacitor recommendations.
# See the Application Information section for R values.
SET
PTH08000W
SLTS248 – JUNE 2005
WITH AUTO-TRACK™ SEQUENCING
•Surface-Mount Package•Up to 2.25-A Output Current at 85°C
•Safety Agency Approvals:UL/CUL 60950, EN60950 VDE (Pending)•4.5-V to 14-V Input Voltage Range•Wide-Output Voltage Adjust(0.9 V to 5.5 V)
•Telecommunications, Instrumentation,•Efficiencies Up to 94%
and General-Purpose Circuits•On/Off Inhibit•Undervoltage Lockout (UVLO)•Output Overcurrent Protection(Nonlatching, Auto-Reset)•Overtemperature Protection•Ambient Temperature Range: –40°C to 85°C
The PTH08000W is a highly integrated, low-cost switching regulator module that delivers up to 2.25 A of outputcurrent. The PTH08000W sources output current at a much higher efficiency than a TO-220 linear regulator IC,eliminating the need for a heatsink. The small size (0.75 inch × 0.5 inch) and flexible operation creates value fora variety of applications.
The input voltage range of the PTH08000W is 4.5 V to 14 V, allowing operation from either a 5-V or 12-V inputbus. Using state-of-the-art switched-mode power-conversion technology, the PTH08000W can step down tovoltages as low as 0.9 V from a 5-V input bus, with less than 1 W of power dissipation. The output voltage canbe adjusted to any voltage over the range, 0.9 V to 5.5 V, using a single external resistor. This series includesAuto-Track™ sequencing. This feature simplifies the task of supply voltage sequencing in a power system byenabling modules to track each other, or any external voltage, during power up and power down. Operatingfeatures include an undervoltage lockout (UVLO), on/off inhibit, overcurrent protection, and overtemperatureprotection. Target applications include telecommunications, test and measurement applications, and high-endconsumer products. This product is available in both through-hole and surface-mount package options, includingtape and reel. The PTH08000W is compatible with TI's roadmap for RoHS and lead-free compliance.
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of TexasInstruments semiconductor products and disclaimers thereto appears at the end of this data sheet.Auto-Track, POLA, TMS320 are trademarks of Texas Instruments.
PRODUCTION DATA information is current as of publication date.
Copyright © 2005, Texas Instruments IncorporatedProducts conform to specifications per the terms of the TexasInstruments standard warranty. Production processing does notnecessarily include testing of all parameters.
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ABSOLUTE MAXIMUM RATINGS
RECOMMENDED OPERATING CONDITIONS
PACKAGE SPECIFICATIONS
PTH08000W
SLTS248 – JUNE 2005
These devices have limited built-in ESD protection. The leads should be shorted together or the deviceplaced in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates.
ORDERING INFORMATION
PTH08000 (Basic Model)
Output Voltage Part Number Description Package Designator
PTH08000WAH Horizontal T/H - Pb-free EUS0.9 V - 5.5 V PTH08000WAS
(1) (2)
Horizontal SMD
(2)
EUTPTH08000WAZ
(1) (3)
Horizontal SMD - Pb-free
(3)
EUT
(1) Add a T suffix for tape and reel option on SMD packages.(2) S suffix versions have SnPb solder ball material.(3) Z suffix versions have SnAgCu solder ball material.
over operating free-air temperature range unless otherwise noted
(1)
PTH08000W UNIT
T
A
Operating free-air temperature Over V
I
range –40 to 85 °CLead temperature (H suffix) 5 seconds 260Solder reflow temperature (S suffix) Surface temperature of module body or pins 235 °CSolder reflow temperature (Z suffix)
(2)
Surface temperature of module body or pins 260T
stg
Storage temperature –40 to 125 °C
(1) Stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. These are stress ratingsonly, and functional operation of the device at these or any other conditions beyond those indicated under recommended operatingconditions is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability(2) Moisture Sensitivity Level (MSL) Rating Level-3-260C-168HR
MIN MAX UNIT
V
I
Input voltage 4.5 14 VT
A
Operating free-air temperature –40 85 °C
PTH08000W (Suffix AH, AS, and AZ)
Weight 1.5 gramsFlammability Meets UL 94 V-OMechanical shock Per Mil-STD-883D, Method 2002.3, 1 ms, ½ sine, mounted 500 G
(1)
Mechanical vibration Mil-STD-883D, Method 2007.2, 20-2000 Hz 20 G
(1)
(1) Qualification limit.
2
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ELECTRICAL CHARACTERISTICS
PTH08000W
SLTS248 – JUNE 2005
at 25°C free-air temperature, V
I
= 12 V, V
O
= 3.3 V, I
O
= I
O
max, C
I
= 100 µF (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
I
O
Output current T
A
= 85°C, natural convection airflow 0 2.25 A
V
I
Input voltage range Over I
O
range 4.5
(1)
14 V
Set-point voltage tolerance T
A
= 25°C ±2
(2)
%
Temperature variation -40 ≤T
A
≤85°C ±0.5 %V
O
V
O
Line regulation Over V
I
range ±7 mV
Load regulation Over I
O
range ±0.13 %V
O
Total output voltage variation Includes set-point, line, load, -40 °C≤T
A
≤85°C 3
(2)
%V
O
V
(ADJ)
Output Voltage Adjust Range Over I
O
range 0.9 5.5 V
R
SET
= 346 Ω, V
O
= 5 V 93.5%
R
SET
= 1.87 k Ω, V
O
= 3.3 V 92%
R
SET
= 3.74 k Ω, V
O
= 2.5 V 90.5%T
A
= 25 °C,ηEfficiency R
SET
= 6.19 k Ω, V
O
= 2 V 89.5%I
O
= 2 A
R
SET
= 8.06 k Ω, V
O
= 1.8 V 88%
R
SET
= 13 k Ω, V
O
= 1.5 V 86.5%
R
SET
= 27.4 k Ω, V
O
= 1.2 V 84.5%
Output voltage ripple 20-MHz bandwidth 40 mV
PP
Overcurrent threshold Reset, followed by autorecovery 3.5 A
C
O
= 100 µF, 1 Recovery time 50 µsA/µs load stepTransient response
from 50% to
V
O
over/undershoot 100 mV100% I
O
max
I
IL
track Track input current (pin 2) Pin to GND –130 µA
dV
track
/dt Track slew rate capability C
O
≤C
O
(max) 1 V/ms
V
I
= increasing 4.35 4.5UVLO Undervoltage lockout VV
I
= decreasing 3.6 4
Input high voltage (V
IH
) V
I
– 0.5 Open
(3)
VInhibit control (pin 5) Input low voltage (V
IL
) –0.2 0.5
Input low current (I
IL
) –5 µA
I
I
(stby) Input standby current Pins 5 and 2 connected 1 mA
f
S
Switching frequency Over V
I
and I
O
ranges 300 kHz
External input capacitance Electrolytic type (C
I
) 100
(4)
µF
Ceramic type (C
O
) 220
µFExternal output capacitance Nonceramic type (C
O
) 100
(5)
330
(6)
Equivalent series resistance (nonceramic) 10
(7)
mΩ
Per Telcordia SR-332, 50% stress,MTBF Calculated reliability 10.3
10
6
HrT
A
= 40°C, ground benign
(1) The minimum input voltage is 4.5 V or (V
O
+ 1.1) V, whichever is greater.(2) The set-point voltage tolerance is affected by the tolerance and stability of R
SET
. The stated limit is unconditionally met if R
SET
has atolerance of 1% with 100 ppm/°C or better temperature stability.(3) This control pin has an internal pullup to the input voltage V
I
. If it is left open-circuit, the module operates when input power is applied. Asmall, low-leakage (< 100 nA) metal-oxide semiconductor field effect transistor (MOSFET) is recommended for control. See theApplication Information for further guidance.(4) An external 100-µF electrolytic capacitor is required across the input (V
I
and GND) for proper operation. Locate the capacitor close tothe module.(5) An external output capacitor is not required for proper operation. Adding 100 µF of distributed capacitance at the load improves thetransient response.(6) This is the calculated maximum capacitance. The minimum ESR limitation often results in a lower value. See the capacitor applicationinformation for further guidance.(7) This is the minimum ESR for all the electrolytic (nonceramic) capacitance. Use 14 m Ωas the minimum when calculating the totalequivalent series resistance (ESR) using the maximum ESR values specified by the capacitor manufacturer.
3
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PIN ASSIGNMENT
PTH08000W
(Top View)
1
5
2
3
4
6
PTH08000W
SLTS248 – JUNE 2005
TERMINAL FUNCTIONS
TERMINAL
I/O DESCRIPTIONNAME NO.
This is the common ground connection for the V
I
and V
O
power connections. It is also the 0-V
DC
reference forGND 1
the Inhibit ,V
O
Adjust, and Track control inputs.This is an analog control input that enables the output voltage to follow an external voltage. This pin becomesactive typically 20 ms after the input voltage has been applied, and allows direct control of the output voltagefrom 0 V up to the nominal set-point voltage. Within this range, the output voltage follows the voltage at theTrack pin on a volt-for-volt basis. When the control voltage is raised above this range, the module regulates atTrack 2 I
its set-point voltage. The feature allows the output voltage to rise simultaneously with other modules poweredfrom the same input bus. If unused, this input should be connected to V
I
.NOTE: Due to the undervoltage lockout feature, the output of the module cannot follow its own input voltageduring power up. For more information, consult the related application note literature number SLTA054 .V
I
3 I The positive input voltage power node to the module, which is referenced to common GND.The Inhibit pin is an open-collector/drain-negative logic input that is referenced to GND. Applying a low-levelground signal to this input disables the module's output. When the Inhibit control is active, the input currentInhibit 4 I
drawn by the regulator is significantly reduced. If the Inhibit pin is left open-circuit, the module produces anoutput voltage whenever a valid input source is applied.A 1% resistor must be connected between this pin and GND (pin 1) to set the output voltage of the modulehigher than 0.9 V. If left open-circuit, the output voltage defaults to this value. The temperature stability of theV
O
Adjust 5 I resistor should be 100 ppm/°C (or better). The set-point range is from 0.9 V to 5.5 V. The electricalspecification table gives the standard resistor value for a number of common output voltages. See theapplication information for further guidance.V
O
6 O The regulated positive power output with respect to the GND node.
4
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TYPICAL CHARACTERISTICS (5-V INPUT)
(1) (2)
50
55
60
65
70
75
80
85
90
95
100
00.5 11.5 22.25
V = 3.3 V
O
VO= 1.5 V
VO= 1.8 V
VO= 1.2 V
VO= 1 V
VO= 0.9 V
Efficiency - %
IO- Output Current - A
V = 2.5 V
O
10
20
30
40
50
00.5 11.5 22.25
V Output Voltage Ripple - mV
O PP
-
IO- Output Current - A
V = 2.5 V
O
V = 1 V
O
V = 0.9 V
O
V = 1.5 V
OV = 1.2 V
OV = 3.3 V
O
V = 1.8 V
O
20
30
40
50
60
70
80
90
00.5 11.5 22.25
IO- Output Current - A
Airflow
T - Ambient Temperature - C
A
o
Nat Conv
0
0.5
0.6
0.3
0.4
0.2
0.1
0.7
0.8
0.9
1
00.5 11.5 22.25
P - Power Dissipation - W
D
I - Output Current - A
O
V = 3.3 V
O
V = 2.5 V
O
V = 1.8 V
O
V = 1.5 V
O
V = 1.2 V
O
V = 0.9 V
O
V = 1 V
O
PTH08000W
SLTS248 – JUNE 2005
EFFICIENCY OUTPUT RIPPLEvs vsOUTPUT CURRENT OUTPUT CURRENT
Figure 1. Figure 2.
POWER DISSIPATION TEMPERATURE DERATINGvs vsOUTPUT CURRENT OUTPUT CURRENT
Figure 3. Figure 4.
(1) The electrical characteristic data has been developed from actual products tested at 25°C. This data is considered typical for theconverter. Applies to Figure 1 ,Figure 2 , and Figure 3 .(2) The temperature derating curves represent the conditions at which internal components are at or below the manufacturer's maximumoperating temperatures. Derating limits apply to modules soldered directly to a 100-mm x 100-mm, double-sided PCB with 2-oz. copper.Applies to Figure 4 .
5
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TYPICAL CHARACTERISTICS (12-V INPUT)
(1) (2)
40
50
60
70
80
90
100
00.5 11.5 22.25
V = 3.3 V
O
VO= 1.5 V
VO= 1.8 V
VO= 1.2 V
VO= 5 V
Efficiency - %
IO- Output Current - A
V = 2.5 V
O
10
25
55
85
40
70
100
00.5 11.5 22.25
V Output Voltage Ripple - mV
O PP
-
I - Output Current - A
O
V = 5 V
O
V = 3.3 V
O
V = 2.5 V
O
V = 1.8 V
O
V = 1.5 V
O
V = 1.2 V
O
20
30
40
50
60
70
80
90
00.5 11.5 22.25
IO- Output Current - A
Airflow
T - Ambient Temperature - C
A
o
Nat Conv
0
0.5
0.6
0.3
0.4
0.2
0.1
0.7
0.8
0.9
1
00.5 11.5 22.25
P - Power Dissipation - W
D
I - Output Current - A
O
V = 3.3 V
O
V = 5 V
O
V = 2.5 V
O
V = 1.8 V
O
V = 1.5 V
O
V = 1.2 V
O
PTH08000W
SLTS248 – JUNE 2005
EFFICIENCY OUTPUT RIPPLEvs vsOUTPUT CURRENT OUTPUT CURRENT
Figure 5. Figure 6.
POWER DISSIPATION TEMPERATURE DERATINGvs vsOUTPUT CURRENT OUTPUT CURRENT
Figure 7. Figure 8.
(1) The electrical characteristic data has been developed from actual products tested at 25°C. This data is considered typical for theconverter. Applies to Figure 5 ,Figure 6 , and Figure 7 .(2) The temperature derating curves represent the conditions at which internal components are at or below the manufacturer's maximumoperating temperatures. Derating limits apply to modules soldered directly to a 100-mm x 100-mm, double-sided PCB with 2-oz. copper.Applies to Figure 8 .
6
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APPLICATION INFORMATION
Adjusting the Output Voltage of the PTH08000W Wide-Output Adjust Power Modules
VI
GND GND
VO
RSET
0.05 W
1%
PTH08000W
15
6
2
3
4
VAdj
O
GNDInhibit
VIVO
C
100 F
(Required)
I
m
C
100 F
(Optional)
O
m
Track
PTH08000W
SLTS248 – JUNE 2005
The V
O
Adjust control (pin 5) sets the output voltage of the PTH08000W product. The adjustment range is from0.9 V to 5.5 V. The adjustment method requires the addition of a single external resistor, R
SET
, that must beconnected directly between the V
O
Adjust and GND (pin 1). Table 1 gives the standard external resistor for anumber of common bus voltages, along with the actual voltage the resistance produces.
For other output voltages, the value of the required resistor can either be calculated using the following formula,or simply selected from the range of values given in Table 2 .Figure 9 shows the placement of the requiredresistor.
Table 1. Standard Values of R
SET
for Common OutputVoltages
V
O
R
SET
V
O(Required) (Standard Value) (Actual)
5 V
(1)
348 Ω5.010 V3.3 V 1.87 k Ω3.315 V2.5 V 3.74 k Ω2.503 V2 V 6.19 k Ω2.012 V1.8 V 8.06 k Ω1.802 V1.5 V 13.0 k Ω1.501 V1.2 V 27.4 k Ω1.205 V1 V 86.6 k Ω1.001 V0.9 V Open 0.9 V
(1) The minimum input voltage is 4.5 V or (V
O
+ 1.1) V, whichever isgreater.
(1) A 0.05-W rated resistor may be used. The tolerance should be 1%, with a temperature stability of 100 ppm/°C (orbetter). Place the resistor as close to the regulator as possible. Connect the resistor directly between pins 5 and 1using dedicated PCB traces.(2) Never connect capacitors from V
O
Adjust to either GND or V
O
. Any capacitance added to the V
O
Adjust pin affects thestability of the regulator.
Figure 9. V
O
Adjust Resistor Placement
7
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PTH08000W
SLTS248 – JUNE 2005
Table 2. Calculated Set-Point Resistor Values
V
O
Required R
SET
V
O
Required R
SET
V
O
Required R
SET
0.900 Open 1.800 8.08 k Ω3.700 1.36 k Ω0.925 355 k Ω1.850 7.56 k Ω3.750 1.32 k Ω0.950 176 k Ω1.900 7.09 k Ω3.800 1.25 k Ω0.975 117 k Ω1.950 6.67 k Ω3.850 1.20 k Ω1.000 87.2 k Ω2.000 6.28 k Ω3.900 1.15 k Ω1.025 69.5 k Ω2.050 5.92 k Ω3.950 1.10 k Ω1.050 57.6 k Ω2.100 5.61 k Ω4.000 1.05 k Ω1.075 49.1 k Ω2.150 5.31 k Ω4.050 1.01 k Ω1.100 42.7 k Ω2.200 5.03 k Ω4.100 964 Ω1.125 37.8 k Ω2.250 4.78 k Ω4.150 922 Ω1.150 33.8 k Ω2.300 4.54 k Ω4.200 880 Ω1.175 30.6 k Ω2.350 4.33 k Ω4.250 840 Ω1.200 27.9 k Ω2.400 4.12 k Ω4.300 801 Ω1.225 25.6 k Ω2.450 3.93 k Ω4.350 763 Ω1.250 23.6 k Ω2.500 3.75 k Ω4.400 726 Ω1.275 21.9 k Ω2.550 3.58 k Ω4.450 690 Ω1.300 20.5 k Ω2.600 3.42 k Ω4.500 655 Ω1.325 19.1 k Ω2.650 3.27 k Ω4.550 621 Ω1.350 17.9 k Ω2.700 3.13 k Ω4.600 588 Ω1.375 16.9 k Ω2.750 2.99 k Ω4.650 556 Ω1.400 14.6 k Ω2.800 2.87 k Ω4.700 525 Ω1.425 13.7 k Ω2.850 2.75 k Ω4.750 494 Ω1.450 13.0 k Ω2.900 2.64 k Ω4.800 465 Ω1.475 13.7 k Ω2.950 2.53 k Ω4.850 436 Ω1.500 13.0 k Ω3.000 2.42 k Ω4.900 408 Ω1.525 12.4 k Ω3.050 2.32 k Ω4.950 380 Ω1.550 11.9 k Ω3.100 2.23 k Ω5.000 353 Ω1.575 11.4 k Ω3.150 2.14 k Ω5.050 327 Ω1.600 10.9 k Ω3.200 2.05 k Ω5.100 301 Ω1.625 10.5 k Ω3.250 1.97 k Ω5.150 276 Ω1.650 10.0 k Ω3.300 1.89 k Ω5.200 252 Ω1.675 9.68 k Ω3.350 1.82 k Ω5.250 228 Ω1.700 9.32 k Ω3.400 1.74 k Ω5.300 205 Ω1.725 8.98 k Ω3.450 1.67 k Ω5.350 182 Ω1.750 8.66 k Ω3.500 1.61 k Ω5.400 160 Ω1.775 8.36 k Ω3.550 1.54 k Ω5.450 138 Ω1.800 8.08 k Ω3.600 1.48 k Ω5.500 117 Ω1.825 7.81 k Ω3.650 1.42 k Ω
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CAPACITOR RECOMMENDATIONS FOR THE PTH08000W WIDE-OUTPUT ADJUST
Input Capacitor
Output Capacitors (Optional)
Ceramic Capacitors
Tantalum Capacitors
Capacitor Table
PTH08000W
SLTS248 – JUNE 2005
POWER MODULES
The minimum required input capacitor is 100 µF of capacitance. When V
O
> 3.4 V, the 100-µF electrolyticcapacitance must be rated for 650-mArms ripple current . For V
O
< 3.4 V, the ripple current rating must be atleast 500 mArms. The ripple current rating of electrolytic capacitors is a major consideration when they are usedat the input.
When specifying regular tantalum capacitors for use at the input, a minimum voltage rating of 2 × (maximum dcvoltage + ac ripple) is highly recommended. This is standard practice to ensure reliability. Polymer-tantalumcapacitors are not affected by this requirement.
For improved ripple reduction on the input bus, ceramic capacitors can also be added to complement therequired electrolytic capacitance.
No output capacitance is required for normal operation. However, applications with load transients (suddenchanges in load current) can benefit by adding external output capacitance. A 100-µF electrolytic or ceramiccapacitor can be used to improve transient response. Adding a 100-µF nonceramic capacitor allows the moduleto meet its transient response specification. A high-quality computer-grade electrolytic capacitor should beadequate.
Electrolytic capacitors should be located close to the load circuit. These capacitors provide decoupling over thefrequency range, 2 kHz to 150 kHz. Aluminum electrolytic capacitors are suitable for ambient temperaturesabove 0°C. For operation below 0°C, tantalum or Os-Con-type capacitors are recommended. When using one ormore nonceramic capacitors, the calculated equivalent ESR should be no lower than 10 mΩ(14 m Ωusing themanufacturer's maximum ESR for a single capacitor). A list of preferred low-ESR-type capacitors are identified inTable 3 .
Above 150 kHz, the performance of aluminum electrolytic capacitors becomes less effective. To further improvethe reflected input ripple current, or the output transient response, multilayer ceramic capacitors must be added.Ceramic capacitors have low ESR and their resonant frequency is higher than the bandwidth of the regulator.When placed at the output, their combined ESR is not critical as long as the total value of ceramic capacitancedoes not exceed 220 µF. Also, to prevent the formation of local resonances, do not exceed the maximumnumber of capacitors specified in the capacitor table.
Additional tantalum-type capacitors can be used at both the input and output, and are recommended forapplications where the ambient operating temperature can be less than 0°C. The AVX TPS, Sprague593D/594/595, and Kemet T495/T510/T520 capacitors series are suggested over many other tantalum types dueto their rated surge, power dissipation, and ripple current capability. As a caution, many general-purposetantalum capacitors have considerably higher ESR and lower ripple current capability. These capacitors are alsoless reliable as they have lower power dissipation capability and surge current ratings. Tantalum capacitors thatdo not have a stated ESR or surge current rating are not recommended for power applications. When specifyingOs-Con and polymer-tantalum capacitors for the output, the minimum ESR limit is encountered well before themaximum capacitance value is reached.
The capacitor table, Table 3 , identifies the characteristics of capacitors from a number of vendors withacceptable ESR and ripple current (rms) ratings. The recommended number of capacitors required at both theinput and output buses is identified for each capacitor type. This is not an extensive capacitor list. Capacitorsfrom other vendors are available with comparable specifications. Those listed are for guidance. The rms ratingand ESR (at 100 kHz) are critical parameters necessary to ensure both optimum regulator performance and longcapacitor life.
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Designing for Load Transients
PTH08000W
SLTS248 – JUNE 2005
The transient response of the dc/dc converter has been characterized using a load transient with a di/dt of1 A/µs. The typical voltage deviation for this load transient is given in the data-sheet specification table using theoptional value of output capacitance. As the di/dt of a transient is increased, the response of a converter'sregulation circuit ultimately depends on its output capacitor decoupling network. This is an inherent limitation withany dc/dc converter once the speed of the transient exceeds its bandwidth capability. If the target applicationspecifies a higher di/dt or lower voltage deviation, the requirement can only be met with additional outputcapacitor decoupling. In these cases, special attention must be paid to the type, value, and ESR of thecapacitors selected.
If the transient performance requirements exceed those specified in the data sheet, the selection of outputcapacitors becomes more important. Review the minimum ESR in the characteristic data sheet for details on thecapacitance maximum.
Table 3. Recommended Input/Output Capacitors
(1)
CAPACITOR CHARACTERISTICS QUANTITY
85°CCAPACITOR VENDOR/
WORK- EQUIVALENT
VENDORMAXIMUM PHYSICAL OUTPUTCOMPONENT
ING VALUE SERIES INPUT
NUMBERRIPPLE SIZE BUSSERIES
VOLTAGE (µF) RESISTANCE BUS
(2)CURRENT (mm) (Optional)(V) (ESR) ( Ω)
(I
RMS
) (mA)
Panasonic WA (SMT) 20 150 0.026 3700 10 × 10,2 1 ≤2 EEFWA1D151PFC (SMT) 25 220 0.150 670 10 × 10,2 1 1 EEVFC1E221P
Panasonic SL 6.3 47 0.018 2500 7,3 × 4,3 N/R
(3)
≤3 EEFCD0J470RSP-cap(SMT) 6.3 120 0.007 3500 7,3 × 4,3 N/R
(3)
≤1 EEFSD0J121R
United Chemi-con PXA 16 150 0.026 3400 10 × 7,7 1 ≤2 PXA16VC151MJ80TP(SMT) V
I
< 14 V
PS 25 100 0.020 4300 10 × 12,5 1 ≤2 25PS100MJ12LXZ 35 220 0.180 760 10 × 12,5 1 1 LXZ35VB221M10X12LLMVY (SMT) 35 333 0.150 670 10 × 10 1 1 MVY35VC331MJ10TP
Nichicon UWG (SMT) 35 100 0.150 670 10 × 10 1 1 UWG1V101MNR1GSF559(Tantalum) 10 100 0.055 2000 7,7 × 4,3 N/R
(3)
≤3 F551A107MNHD 25 220 0.072 760 8 × 11,5 1 1 UHD1E221MPR
Sanyo Os-con\ POS-Cap 10 68 0.025 2400 7,3 × 4,3 N/R
(3)
≤2 10TPE68MSVP (SMT) 20 150 0.020 4320 10 × 12,7 1 ≤1 20SVP150MSP 20 120 0.024 3110 8 × 10,5 1 ≤2 20SP120M
AVX Tantalum TPS (SMD) 35 47 0.100 1430 7,3 L × 4,3 2 ≤4 TPSV476M035R010025 47 0.100 1150 W × 4,1 H 2 ≤4 TPSE476M025R0100
V
I
< 13 V
Kemet T520 (SMD) 10 100 0.025 > 2000 7,3 L × 5,7 N/R
(3)
≤1 T520V107M010ASE025AO-CAP 6.3 100 0.018 > 2900 W × 4 H N/R
(3)
≤1 A700V107M006AT
Vishay/Sprague 35 47 0.280 > 1000 7,3 L × 6 W 2 ≤5 595D476X0035R2T594D/SVP(SMD) 20 100 0.025 3200 × 4,1 H 8 × 1 ≤2 94SVP107X0020E1212
94SS 20 150 0.030 3200 10 × 10,5 1 ≤2 94SS157X0020FBP
Murata Ceramic X5R 16 47 0.002 > 1400 3225 1
(4)
≤3 GRM32ER61C476M
V
I
< 14 V
TDK ceramic X5R 6.3 47 0.002 > 1400 3225 N/R
(3)
≤3 C3225X5R0J476MT
V
O
< 5.5 V
Kemet Ceramic X5R 6.3 47 0.002 > 1400 3225 N/R
(3)
≤3 C1210C476K9PAC
V
O
< 5.5 V
TDK Ceramic X7R 25 10 0.002 > 1400 3225 1
(4)
≤4 C3225X7R1E106KMurata Ceramic X5R 25 10 0.002 > 1400 1
(4)
≤4 GRM32DR61E106KA12Kemet 16 10 0.002 > 1400 1
(4)
≤4 C1210C106M4PAC
V
I
< 14 V
TDK Ceramic X7R 25 2.2 0.002 > 1400 3225 1 1 C3225X7R1E225KT/MTMurata Ceramic X7R 25 2.2 0.002 > 1400 1 1 GRM32RR71J225KC01LKemet 25 2.2 0.002 > 1400 1 1 C1210C225K3RAC
(1) Check with capacitor manufacturers for availability and lead-free status.(2) The voltage rating of the input capacitor must be selected for the desired operating input voltage range of the regulator. To operate theregulator at a higher input voltage, select a capacitor with a higher voltage rating.(3) The voltage rating of the input capacitor must be selected for the desired operating input voltage range of the regulator. To operate theregulator at a higher input voltage, select a capacitor with a higher voltage rating.(4) Ceramic capacitors can be used to complement electrolytic types at the input bus by reducing high-frequency ripple current.
10
www.ti.com
Features of the PTH/PTV Family of Nonisolated, Wide-Output Adjustable Power Modules
POLA™ Compatibility
Soft-Start Power Up
1
5
6
3
4
++
2
V = 12 V
I
Inhibit
Track
PTH08000W
V Adj
O
VO
V = 3.3 V
O
1.87 k
0.05 W, 1%
W
VI
GND
GND
GND
CI
100 F
(Required)
µ
CO
100 F
(Optional)
µ
t - Time = 4 ms/div
V (5 V/div)
I
V (2 V/div)
O
I (500 mA/div)
I
PTH08000W
SLTS248 – JUNE 2005
The PTH/PTV family of nonisolated, wide-output adjustable power modules from Texas Instruments areoptimized for applications that require a flexible, high-performance module that is small in size. Each of theseproducts are POLA™ compatible. POLA-compatible products are produced by a number of manufacturers, andoffer customers advanced, nonisolated modules with the same footprint and form factor. POLA parts are alsoensured to be interoperable, thereby providing customers with true second-source availability.
The Auto-Track feature allows the power up of multiple PTH/PTV modules to be directly controlled from theTrack pin. However, in a stand-alone configuration, or when the Auto-Track feature is not being used, the Trackpin should be directly connected to the input voltage, V
I
(see Figure 10 ).
Figure 10. Power-Up Application Circuit
When the Track pin is connected to the input voltage, the Auto-Track function is permanently disengaged. Thisallows the module to power up entirely under the control of its internal soft-start circuitry. When power up isunder soft-start control, the output voltage rises to the set-point at a quicker and more linear rate.
Figure 11. Power-Up Waveform
11
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Current Limit Protection
Thermal Shutdown
Output On/Off Inhibit
V = 12 V
IV = 3.3 V
O
Inhibit
GND GND
1.87 k
0.05 W, 1%
W
PTH08000W
1
25
6
3
4
V Adj
O
Track
GNDInhibit
VIVO
Q1
BSS138
L
O
A
D
C
100 F
(Optional)
O
m
C
100 F
(Required)
I
m
PTH08000W
SLTS248 – JUNE 2005
From the moment a valid input voltage is applied, the soft-start control introduces a short time delay (typicallyless than 5 ms) before allowing the output voltage to rise. The output then progressively rises to the moduleset-point voltage. Figure 11 shows the soft-start power-up characteristic of the PTH0800W, operating from a12-V input bus and configured for a 3.3-V output. The waveforms were measured with a 2-A resistive load andthe Auto-Track feature disabled. The initial rise in input current when the input voltage first starts to rise is thecharge current drawn by the input capacitors. Power up is complete within 25 ms.
The PTH08000 modules protect against load faults with an output overcurrent trip. Under a load fault condition,the output current cannot exceed the current limit value. Attempting to draw current that exceeds the current limitvalue causes the output voltage to enter into a hiccup mode of operation, whereby the module continues in acycle of successive shutdown and power up until the load fault is removed. On removal of the fault, the outputvoltage promptly recovers.
Thermal shutdown protects the module internal circuitry against excessively high temperatures. A rise intemperature may be the result of a drop in airflow, a high ambient temperature, or a higher than normal outputcurrent. If the junction temperature of the internal components exceeds 165°C, the module shuts down. Thisreduces the output voltage to zero. The module starts up automatically, by initiating a soft-start power up whenthe sensed temperature decreases 10°C below the thermal shutdown trip-point.
For applications requiring output voltage on/off control, the PTH08000 power module incorporates an outputon/off Inhibit control (pin 4). The inhibit feature can be used wherever there is a requirement for the outputvoltage from the regulator to be turned off.
The power module functions normally when the Inhibit pin is left open-circuit, providing a regulated outputwhenever a valid source voltage is connected to V
I
with respect to GND.
Figure 12 shows the typical application of the inhibit function. Note the discrete transistor (Q1). The Inhibit controlhas its own internal pullup to 3 V. An open-collector or open-drain device is recommended to control this input.
Turning Q1 on applies a low voltage to the Inhibit control pin and disables the output of the module. If Q1 is thenturned off, the module executes a soft-start power-up sequence. A regulated output voltage is produced within20 ms. Figure 13 shows the typical rise in the output voltage, following the turn off of Q1. The turn off of Q1corresponds to the rise in the waveform, Q1 V
DS
. The waveforms were measured with a 2-A resistive load.
Figure 12. On/Off Inhibit Control Circuit
12
www.ti.com
t - Time = 4 ms/div
V (2 V/div)
O
I (500 mA/div)
I
V (2 V/div)
INH
PTH08000W
SLTS248 – JUNE 2005
Figure 13. Power-Up Response From Inhibit Control
13
www.ti.com
Auto-Track™ Function
How Auto-Track™ Works
U1
C6
++
U2
GND
RESIN
CT
REF
8
U3*
TL7712A
7
2
3
6
1
5
4
C
3.3 F
T
m
C
0.1 F
REF
mR
10 k
RST
W
C2
1
5
6
4
GNDInhibit
2
1
5
6
4
GNDInhibit
2
C5
C1
3
3
12 V
Track
Track
*Use TPS3808G50 with 5-V input bus modules.
1.89 kW
3.75 kW
VI
VI
VO
VO
PTH08000W
PTH08000W
V 1 = 3.3 V
O
V 2 = 2.5 V
O
V Adj
O
V Adj
O
SENSE
RESET
RESET
VCC
PTH08000W
SLTS248 – JUNE 2005
The Auto-Track function is unique to the PTH/PTV family, and is available with all POLA products. Auto-Trackwas designed to simplify the amount of circuitry required to make the output voltage from each module power upand power down in sequence. The sequencing of two or more supply voltages during power up is a commonrequirement for complex mixed-signal applications that use dual-voltage VLSI ICs such as the TMS320™ DSPfamily, microprocessors, and ASICs.
Auto-Track works by forcing the module output voltage to follow a voltage presented at the Track control pin
(1)
.This control range is limited to between 0 V and the module set-point voltage. Once the track-pin voltage israised above the set-point voltage, the module output remains at its set-point
(2)
. As an example, if the Track pinof a 2.5-V regulator is at 1 V, the regulated output is 1 V. If the voltage at the Track pin rises to 3 V, the regulatedoutput does not go higher than 2.5 V.
When under Auto-Track control, the regulated output from the module follows the voltage at its Track pin on avolt-for-volt basis. By connecting the Track pin of a number of these modules together, the output voltages followa common signal during power up and power down. The control signal can be an externally generated masterramp waveform, or the output voltage from another power supply circuit
(3)
. For convenience, the Track inputincorporates an internal RC-charge circuit. This operates off the module input voltage to produce a suitable risingwaveform at power up.
Figure 14. Auto-Track Circuit
14
www.ti.com
t - Time = 4 ms/div
V 1 (1 V/div)
O
V 2 (1 V/div)
O
V (1 V/div)
TRK
t - Time = 400 s/divm
V 1 (1 V/div)
O
V 2 (1 V/div)
O
V (1 V/div)
TRK
Typical Application
PTH08000W
SLTS248 – JUNE 2005
Figure 15. Simultaneous Power Up With
Figure 16. Simultaneous Power Down WithAuto-Track Control
Auto-Track Control
The basic implementation of Auto-Track allows for simultaneous voltage sequencing of a number of Auto-Trackcompliant modules. Connecting the Track inputs of two or more modules forces their track input to follow thesame collective RC-ramp waveform, and allows their power-up sequence to be coordinated from a commonTrack control signal. This can be an open-collector (or open-drain) device, such as a power-up reset voltagesupervisor IC. See U3 in Figure 14 .
To coordinate a power-up sequence, the Track control must first be pulled to ground potential. This should bedone at or before input power is applied to the modules. The ground signal should be maintained for at least20 ms after input power has been applied. This brief period gives the modules time to complete their internalsoft-start initialization
(4)
, enabling them to produce an output voltage. A low-cost supply voltage supervisor IC,that includes a built-in time delay, is an ideal component for automatically controlling the Track inputs at powerup.
Figure 14 shows how the TPS3808G50 supply voltage supervisor IC (U3) can be used to coordinate thesequenced power up of two 5-V input Auto-Track modules. The output of the TPS3808G50 supervisor becomesactive above an input voltage of 0.8 V, enabling it to assert a ground signal to the common track control wellbefore the input voltage has reached the module's undervoltage lockout threshold. The ground signal ismaintained until approximately 27 ms after the input voltage has risen above U3's voltage threshold, which is4.65 V. The 27-ms time period is controlled by the capacitor C3. The value of 4700 pF provides sufficient timedelay for the modules to complete their internal soft-start initialization. The output voltage of each moduleremains at zero until the track control voltage is allowed to rise. When U3 removes the ground signal, the trackcontrol voltage automatically rises. This causes the output voltage of each module to rise simultaneously with theother modules, until each reaches its respective set-point voltage.
Figure 15 shows the output voltage waveforms from the circuit of Figure 14 after input voltage is applied to thecircuit. The waveforms, V
O
1 and V
O
2, represent the output voltages from the two power modules, U1 (3.3 V) andU2 (2.5 V), respectively. V
O
1 and V
O
2 are shown rising together to produce the desired simultaneous power-upcharacteristic.
The same circuit also provides a power-down sequence. When the input voltage falls below U3's voltagethreshold, the ground signal is re-applied to the common track control. This pulls the track inputs to zero volts,forcing the output of each module to follow. Power down is normally complete before the input voltage has fallenbelow the modules' undervoltage lockout. This is an important constraint. Once the modules recognize that aninput voltage is no longer present, their outputs can no longer follow the voltage applied at their track input.During a power-down sequence, the fall in the output voltage from the modules is limited by the Auto-Track slewrate capability.
15
www.ti.com
Notes on Use of Auto-Track™
PTH08000W
SLTS248 – JUNE 2005
1. The Track pin voltage must be allowed to rise above the module set-point voltage before the moduleregulates at its adjusted set-point voltage.2. The Auto-Track function tracks almost any voltage ramp during power up, and is compatible with rampspeeds of up to 1 V/ms.3. The absolute maximum voltage that may be applied to the Track pin is the input voltage V
I
.4. The module cannot follow a voltage at its track control input until it has completed its soft-start initialization.This takes about 20 ms from the time that a valid voltage has been applied to its input. During this period, itis recommended that the Track pin be held at ground potential.5. The Auto-Track function is disabled by connecting the Track pin to the input voltage (V
I
). When Auto-Track isdisabled, the output voltage rises at a quicker and more linear rate after input power has been applied.
16
PACKAGING INFORMATION
Orderable Device Status (1) Package
Type Package
Drawing Pins Package
Qty Eco Plan (2) Lead/Ball Finish MSL Peak Temp (3)
PTH08000WAH ACTIVE DIP MOD
ULE EUS 6 56 TBD Call TI Level-1-235C-UNLIM
PTH08000WAS ACTIVE DIP MOD
ULE EUT 6 49 TBD Call TI Level-1-235C-UNLIM
PTH08000WAST ACTIVE DIP MOD
ULE EUT 6 250 TBD Call TI Level-1-235C-UNLIM
PTH08000WAZ ACTIVE DIP MOD
ULE EUT 6 49 TBD Call TI Call TI
PTH08000WAZT ACTIVE DIP MOD
ULE EUT 6 250 TBD Call TI Call TI
(1) The marketing status values are defined as follows:
ACTIVE: Product device recommended for new designs.
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in
a new design.
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.
OBSOLETE: TI has discontinued the production of the device.
(2) Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS) or Green (RoHS & no Sb/Br) - please check
http://www.ti.com/productcontent for the latest availability information and additional product content details.
TBD: The Pb-Free/Green conversion plan has not been defined.
Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements
for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered
at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes.
Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame
retardants (Br or Sb do not exceed 0.1% by weight in homogeneous material)
(3) MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder
temperature.
Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is
provided. TI bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the
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In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI
to Customer on an annual basis.
PACKAGE OPTION ADDENDUM
www.ti.com 19-Aug-2005
Addendum-Page 1
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