1
FEATURES
DESCRIPTION
APPLICATIONS
0
10
20
30
40
50
60
70
80
90
100
0.01 0.1 1 10
Efficiency-%
I -LoadCurrent- A
L
V =3.3V
O
V =12V
I
V =18V
I
V =24V
I
V =28V
I
V =5V
I
PH
VIN
GND
BOOT
VSENSE
COMP
SS
C
SS
D1
VIN
VOUT
EN
TPS54231
C
I
C
BOOT
L
O
C
O
Ren1
R
O2
C
1
C
2
R
3
Ren2
R
O1
TPS54231
www.ti.com
.............................................................................................................................................................................................. SLUS851 – OCTOBER 2008
2A, 28V INPUT, STEP DOWN SWIFT™ DC/DC CONVERTER WITH ECO-MODE™
2
• 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 R
DS(on)
high side
• Integrated 80 m Ω High Side MOSFET Supports
MOSFET. To increase efficiency at light loads, a
up to 2A Continuous Output Current
pulse skipping Eco-mode™ feature is automatically
• High Efficiency at Light Loads with a Pulse
activated. Furthermore, the 1 µ A shutdown supply
Skipping Eco-mode™
current allows the device to be used in battery
powered applications. Current mode control with
• Fixed 570kHz Switching Frequency
internal slope compensation simplifies the external
• Typical 1 µ A Shutdown Quiescent Current
compensation calculations and reduces component
• Adjustable Slow Start Limits Inrush Currents
count while allowing the use of ceramic output
capacitors. A resistor divider programs the hysteresis
• Programmable UVLO Threshold
of the input under-voltage lockout. An overvoltage
• Overvoltage Transient Protection
transient protection circuit limits voltage overshoots
• Cycle by Cycle Current Limit, Frequency Fold
during startup and transient conditions. A cycle by
Back and Thermal Shutdown Protection
cycle current limit scheme, frequency fold back and
thermal shutdown protect the device and the load in
• Available in Easy-to-Use SOIC8 Package
the event of an overload condition. The TPS54231 is
• Supported by SwitcherPro™ Software Tool
available in an 8-pin SOIC package that has been
(http://focus.ti.com/docs/toolsw/folders/print/s
internally optimized to improve thermal performance.
witcherpro.html )
• For SWIFT™ Documentation, See the TI
Website at www.ti.com/swift
• 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
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.
2 SWIFT, Eco-mode, SwitcherPro are trademarks of Texas Instruments.
PRODUCTION DATA information is current as of publication date.
Copyright © 2008, Texas Instruments Incorporated
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
