SLVS632E – JANUARY 2006 – REVISED SEPTEMBER 2013
3-A, WIDE INPUT RANGE, STEP-DOWN CONVERTER
Check for Samples:
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FEATURES
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Wide Input Voltage Range:
– TPS5430: 5.5 V to 36 V
– TPS5431: 5.5 V to 23 V
Up to 3-A Continuous (4-A Peak) Output
Current
High Efficiency up to 95% Enabled by 110-mΩ
Integrated MOSFET Switch
Wide Output Voltage Range: Adjustable Down
to 1.22 V with 1.5% Initial Accuracy
Internal Compensation Minimizes External
Parts Count
Fixed 500 kHz Switching Frequency for Small
Filter Size
Improved Line Regulation and Transient
Response by Input Voltage Feed Forward
System Protected by Overcurrent Limiting,
Overvoltage Protection and Thermal Shutdown
–40°C to 125°C Operating Junction
Temperature Range
Available in Small Thermally Enhanced 8-Pin
SOIC PowerPAD™ Package
DESCRIPTION
The TPS5430/TPS5431 is a high-output-current
PWM converter that integrates a low resistance high
side N-channel MOSFET. Included on the substrate
with the listed features are a high performance
voltage error amplifier that provides tight voltage
regulation accuracy under transient conditions; an
undervoltage-lockout circuit to prevent start-up until
the input voltage reaches 5.5 V; an internally set
slow-start circuit to limit inrush currents; and a voltage
feed-forward circuit to improve the transient
response. Using the ENA pin, shutdown supply
current is reduced to 18
μA
typically. Other features
include an active-high enable, overcurrent limiting,
overvoltage protection and thermal shutdown. To
reduce design complexity and external component
count, the TPS5430/TPS5431 feedback loop is
internally compensated. The TPS5431 is intended to
operate from power rails up to 23 V. The TPS5430
regulates a wide variety of power sources including
24-V bus.
The TPS5430/TPS5431 device is available in a
thermally enhanced, easy to use 8-pin SOIC
PowerPAD™ package. TI provides evaluation
modules and the Designer software tool to aid in
quickly achieving high-performance power supply
designs to meet aggressive equipment development
cycles.
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APPLICATIONS
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Consumer: Set-top Box, DVD, LCD Displays
Industrial and Car Audio Power Supplies
Battery Chargers, High Power LED Supply
12-V/24-V Distributed Power Systems
Simplified Schematic
Efficiency vs Output Current
100
VOUT
VIN
VIN
PH
95
90
TPS5430/31
Efficiency − %
NC
NC
BOOT
85
80
75
70
65
60
55
50
0
0.5
2
1
1.5
2.5
3
I
O
-
Output Current
-
A
3.5
V
I
= 12 V
V
O
= 5 V
f
s
= 500 kHz
o
T
A
= 25 C
ENA VSENSE
GND
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Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PowerPAD is a trademark of Texas Instruments.
Copyright © 2006–2013, Texas Instruments Incorporated
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.