1

FEATURES

DESCRIPTION

APPLICATIONS

0

10

20

30

40

50

60

70

80

90

100

0.01

0.1

1

10

I -LoadCurrent- A

L

V =5V

I

V =12V

I

V =18V

I

V =24V

I

V =28V

I

PH

VIN

GND

BOOT

VSENSE

COMP

SS

C

SS

D1

VIN

VOUT

EN

TPS54331

C

I

C

BOOT

L

O

C

O

Ren1

R

O2

C

1

C

2

R

3

Ren2

R

O1

TPS54331

3A, 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 TPS54331 is a 28-V, 3-A non-synchronous buck

converter that integrates a low Rds(on) high side

• Integrated 80 mΩ High Side MOSFET Supports

MOSFET. To increase efficiency at light loads, a

up to 3A Continuous Output Current

pulse skipping Eco-mode™ feature is automatically

• High Efficiency at Light Loads with a Pulse

activated. Furthermore, the 1

µA 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 1µA 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 hysterisis

• 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 TPS54331 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.