TPS5430-Q1 Datasheet, PDF (1/27 Pages) Texas Instruments – 3-A WIDE-INPUT-RANGE STEP-DOWN SWIFT CONVERTER

TPS5430-Q1
www.ti.com ................................................................................................................................................... SLVS751C – NOVEMBER 2007 – REVISED JULY 2009
3-A WIDE-INPUT-RANGE STEP-DOWN SWIFT™ CONVERTER
FEATURES
1
•2 Qualified for Automotive Applications
• Wide Input Voltage Range: 5.5 V to 36 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
DESCRIPTION
As a member of the SWIFT™ family of dc/dc
regulators, the TPS5430 is a high-output-current
pulse-width modulation (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 (UVLO) 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 enable (ENA) pin, shutdown
supply current is reduced to 18 µA typically. Other
features include an active-high enable, overcurrent
limiting, overvoltage protection (OVP) and thermal
shutdown. To reduce design complexity and external
component count, the TPS5430 feedback loop is
internally compensated. The TPS5430 regulates a
wide variety of power sources including 24-V buses.
The TPS5430 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.
APPLICATIONS
• Industrial and Car Audio Power Supplies
• Battery Chargers, High-Power LED Supplies
• 12-V/24-V Distributed Power Systems
Simplified Schematic
Efficiency vs Output Current
VIN
VIN
PH
TPS5430
NC BOOT
NC
ENA VSENSE
GND
VOUT
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, SWIFT 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 © 2007–2009, Texas Instruments Incorporated