TPS54231
www.ti.com .............................................................................................................................................................................................. SLUS851–OCTOBER 2008
2A, 28V INPUT, STEP DOWN SWIFT™ DC/DC CONVERTER WITH ECO-MODE™
1
FEATURES
DESCRIPTION
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•
•
•
3.5V to 28V Input Voltage Range
Adjustable Output Voltage Down to 0.8V
The TPS54231 is a 28-V, 2-A non-synchronous buck
converter that integrates a low RDS(on) high side
MOSFET. To increase efficiency at light loads, a
pulse skipping Eco-mode™ feature is automatically
activated. Furthermore, the 1 µA shutdown supply
current allows the device to be used in battery
powered applications. Current mode control with
internal slope compensation simplifies the external
compensation calculations and reduces component
count while allowing the use of ceramic output
capacitors. A resistor divider programs the hysteresis
of the input under-voltage lockout. An overvoltage
transient protection circuit limits voltage overshoots
during startup and transient conditions. A cycle by
cycle current limit scheme, frequency fold back and
thermal shutdown protect the device and the load in
the event of an overload condition. The TPS54231 is
available in an 8-pin SOIC package that has been
internally optimized to improve thermal performance.
Integrated 80 mΩ High Side MOSFET Supports
up to 2A Continuous Output Current
•
High Efficiency at Light Loads with a Pulse
Skipping Eco-mode™
•
•
•
•
•
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Fixed 570kHz Switching Frequency
Typical 1µA Shutdown Quiescent Current
Adjustable Slow Start Limits Inrush Currents
Programmable UVLO Threshold
Overvoltage Transient Protection
Cycle by Cycle Current Limit, Frequency Fold
Back and Thermal Shutdown Protection
•
•
Available in Easy-to-Use SOIC8 Package
Supported by SwitcherPro™ Software Tool
(http://focus.ti.com/docs/toolsw/folders/print/s
witcherpro.html)
•
For SWIFT™ Documentation, See the TI
Website at www.ti.com/swift
APPLICATIONS
•
Consumer Applications such as Set-Top
Boxes, CPE Equipment, LCD Displays,
Peripherals, and Battery Chargers
•
•
Industrial and Car Audio Power Supplies
5V, 12V and 24V Distributed Power Systems
SIMPLIFIED SCHEMATIC
EFFICIENCY
100
90
Ren1
EN
VIN
CI
VIN
80
Ren2
V
= 12 V
I
70
60
TPS54231
V
= 18 V
I
CBOOT
V
= 24 V
I
BOOT
PH
LO
V = 28 V
I
50
40
V
= 5 V
VOUT
I
SS
CO
30
20
10
0
D1
RO1
COMP
C1
R3
CSS
V
1
= 3.3 V
O
C2
VSENSE
GND
0.01
0.1
10
RO2
I
- Load Current - A
L
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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.
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SWIFT, Eco-mode, SwitcherPro 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 © 2008, Texas Instruments Incorporated
TI [ TEXAS INSTRUMENTS ]
