TPS5431DDAR Datasheet, PDF (1/32 Pages) Texas Instruments – 3-A, WIDE INPUT RANGE, STEP-DOWN CONVERTER

TPS5430
TPS5431
www.ti.com
SLVS632E – JANUARY 2006 – REVISED SEPTEMBER 2013
3-A, WIDE INPUT RANGE, STEP-DOWN CONVERTER
Check for Samples: TPS5430 , TPS5431
FEATURES
1
•2 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
APPLICATIONS
• 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
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.
Simplified Schematic
VIN
VIN
PH
TPS5430/31
NC BOOT
NC
ENA VSENSE
GND
VOUT
Efficiency vs Output Current
100
95
90
85
80
75
70
65
V_I = 12 V
V_O = 5 V
60
f_s = 500 kHz
55
T_A = 25^oC
50
0 0.5 1 1.5 2 2.5 3 3.5
IO - Output Current - A
1
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.
2
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.
Copyright © 2006–2013, Texas Instruments Incorporated