0

10

20

30

40

50

60

70

80

90

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TPS54331

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TPS54331-Q1

www.ti.com

SLVSAB5 – NOVEMBER 2010

3-A, 28-V INPUT, STEP-DOWN SWIFT™ DC/DC CONVERTER WITH Eco-Mode™

Check for Samples: TPS54331-Q1

1

FEATURES

APPLICATIONS

•

Consumer Applications such as Set-Top

2

•

Qualified for Automotive Applications

Boxes, CPE Equipment, LCD Displays,

•

3.5V to 28V Input Voltage Range

Peripherals, and Battery Chargers

•

Adjustable Output Voltage Down to 0.8V

•

Industrial and Car Audio Power Supplies

•

Integrated 80 m

Ω High Side MOSFET Supports

•

5-V, 12-V and 24-V Distributed Power Systems

up to 3A Continuous Output Current

•

High Efficiency at Light Loads with Pulse

DESCRIPTION

Skipping Eco-mode™ Control

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

•

Fixed 570kHz Switching Frequency

converter that integrates a low RDS(on) high side

•

Typical 1mA Shutdown Quiescent Current

MOSFET. To increase efficiency at light loads, a

pulse skipping Eco-mode™ feature is automatically

•

Adjustable Slow Start Limits Inrush Currents

activated. Furthermore, the 1 mA shutdown supply

•

Programmable UVLO Threshold

current allows the device to be used in battery

•

Overvoltage Transient Protection

powered applications. Current mode control with

internal slope compensation simplifies the external

•

Cycle-by-Cycle Current Limit, Frequency Fold

compensation calculations and reduces component

Back and Thermal Shutdown Protection

count while allowing the use of ceramic output

•

Available in Easy-to-Use SOIC8 Package

capacitors. A resistor divider programs the hysteresis

•

Supported by SwitcherPro™ Software Tool

of the input under-voltage lockout. An overvoltage

(http://focus.ti.com/docs/toolsw/folders/print/s

transient protection circuit limits voltage overshoots

during startup and transient conditions. A cycle by

witcherpro.html)

cycle current limit scheme, frequency fold back and

•

For SWIFT™ Documentation, See the TI

thermal shutdown protect the device and the load in

Website at www.ti.com/swift

the event of an overload condition. The TPS54331 is

available in an 8-pin SOIC package that has been

internally optimized to improve thermal performance.

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, PowerPAD are trademarks of Texas Instruments.

PRODUCTION DATA information is current as of publication date.

Copyright © 2010, 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.