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SLVS632 – JANUARY 2006
5.5-V to 36-V, 3-A STEP-DOWN SWIFT™ CONVERTER
FEATURES
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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 Over Current Limiting
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
APPLICATIONS
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Consumer: Set-top Box, DVD, LCD Displays
Industrial and Car Audio Power Supplies
Battery Chargers, High Power LED Supply
12V/24V Distributed Power Systems
DESCRIPTION
As a member of the SWIFT™ family of DC/DC
regulators, the TPS5430 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
under-voltage-lockout circuit to prevent start-up until
the input voltage reaches 5.5V; an internally set
slow-start circuit to limit inrush currents; and a voltage
feed-forward circuit to improve the transient
response. Other features include an active high
enable, over current protection and thermal
shutdown. To reduce design complexity and external
component count, the TPS5430 feedback loop is
internally compensated.
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.
100
95
SIMPLIFIED SCHEMATIC
VIN
VIN
PH
TPS5430
NC
NC
ENA VSENSE
GND
BOOT
VOUT
Efficiency − %
90
85
80
75
70
65
60
55
50
0
0.5
I
O
1
1.5
2
2.5
− Output Current − A
3
3.5
V
I
= 12 V,
V
0
= 5 V,
fs = 500 kHz
Efficiency vs Output Current
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.
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, Texas Instruments Incorporated
TI [ TEXAS INSTRUMENTS ]
