厂商Texas Instruments 半导体半导体 TPS54331 数据手册，datasheet pdf下载

型号：	TPS54331
厂商：	Texas Instruments
标准：
分类：	半导体
描述：	3A, 28v input, step down swift?? DC/DC converter with eco-mode
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TPS54331的详细信息

Feature：	3.5V to 28V Input, 3A, 570kHz Step-Down Converter with Eco-mode

TPS54331

www.ti.com

SLVS839D –JULY 2008–REVISED JANUARY 2012

3A, 28V INPUT, STEP DOWN SWIFT™ D C /D C CONVERTER WITH ECO-MODE™

Check for Samples: TPS54331

FEATURES

APPLICATIONS

•

3.5V to 28V Input Voltage Range

•

Consumer Applications such as Set-Top

Boxes, CPE Equipment, LCD Displays,

Peripherals, and Battery Chargers

•

Adjustable Output Voltage Down to 0.8V

Integrated 80 mΩ High Side MOSFET Supports

up to 3A Continuous Output Current

•

Industrial and Car Audio Power Supplies

5V, 12V and 24V Distributed Power Systems

•

High Efficiency at Light Loads with a Pulse

Skipping Eco-mode™

DESCRIPTION

•

Fixed 570kHz Switching Frequency

Typical 1μA Shutdown Quiescent Current

Adjustable Slow Start Limits Inrush Currents

Programmable UVLO Threshold

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

converter that integrates a low R_DS(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 TPS54331 is

available in 8-pin SOIC package and 8-pin SOIC

PowerPAD^TMpackage that have been internally

optimized to improve thermal performance.

Overvoltage Transient Protection

Cycle-by-Cycle Current Limit, Frequency Fold

Back and Thermal Shutdown Protection

•

Available in Easy-to-Use SOIC8 Package or

Thermally Enhanced SOIC8 PowerPAD^TM

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

SIMPLIFIED SCHEMATIC

Figure 1. EFFICIENCY

TPS54331D

Ren1

100

VIN

C_I

VIN

Ren2

TPS54331D

=�12�V

C_BOOT

BOOT

=�18�V

L_O

=�24�V

OUT

=�28�V

COMP

C_O

R_O1

V =�5�V

C₁

R₃

C_SS

C₂

VSENSE

GND

R_O2

=�3.3�V

0.01

0.1

-�Load�Current�- A

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, Eco-mode, SwitcherPro, 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.