TPS5431 Datasheet, PDF (1/32 Pages) Texas Instruments – 3-A, WIDE INPUT RANGE, STEP-DOWN SWIFT™ CONVERTER

TPS5430
TPS5431
www.ti.com
SLVS632D – JANUARY 2006 – REVISED JANUARY 2013
3-A, WIDE INPUT RANGE, STEP-DOWN SWIFT™ 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
• For SWIFT™ Documentation, Application
Notes and Design Software, See the TI Website
at www.ti.com/swift
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
As a member of the SWIFT™ family of DC/DC
regulators, 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 SWIFT™ 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.
SWIFT, PowerPAD are trademarks 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