SW

VIN

GND

BOOT

FB

COMP

TPS54340

EN

RT/CLK

V

IN

V

OUT

R1

R3

0

10

20

30

40

50

60

70

80

100

0

0.5

1.0

1.5

2.0

I - Output Current - A

O

2.5

3.0

90

3.5

V

= 12V

IN

fsw = 600 kHz

V

= 3.3V

OUT

V

= 5V

OUT

TPS54340

www.ti.com

SLVSBK0A – OCTOBER 2012 – REVISED FEBRUARY 2013

42 V Input, 3.5 A, Step Down DC-DC Converter with Eco-mode™

Check for Samples: TPS54340

1

FEATURES

2

•

4.5 V to 42 V (45 V Abs Max) Input Range

•

Adjustable UVLO Voltage and Hysteresis

•

3.5 A Continuous Current, 4.5 A Minimum Peak

•

Internal Soft-Start

Inductor Current Limit

•

Accurate Cycle-by-Cycle Current Limit

•

Current Mode Control DC-DC Converter

•

Thermal, Overvoltage, and Frequency

•

92-m

Ω High-Side MOSFET

Foldback Protection

•

High Efficiency at Light Loads with Pulse

•

0.8 V 1% Internal Voltage Reference

Skipping Eco-mode™

•

8-Pin HSOIC with PowerPAD™ Package

•

Low Dropout at Light Loads with Integrated

•

BOOT Recharge FET

•

Supported by WEBENCH™ Software Tool

•

146

μA Operating Quiescent Current

•

1

μA Shutdown Current

APPLICATIONS

•

100 kHz to 2.5 MHz Fixed Switching Frequency

•

12 V, 24 V and 48 V Industrial, Automotive and

Communications Power Systems

•

Synchronizes to External Clock

DESCRIPTION

The TPS54340 is a 42 V, 3.5 A, step down regulator with an integrated high side MOSFET. The device survives

load dump pulses up to 45 V per ISO 7637. Current mode control provides simple external compensation and

flexible component selection. A low ripple pulse skip mode reduces the no load supply current to 146

μA.

Shutdown supply current is reduced to 1

μA when the enable pin is pulled low.

Undervoltage lockout is internally set at 4.3 V but can be increased using the enable pin. The output voltage start

up ramp is internally controlled to provide a controlled start up and eliminate overshoot.

A wide switching frequency range allows either efficiency or external component size to be optimized. Frequency

foldback and thermal shutdown protects internal and external components during an overload condition.

The TPS54340 is available in an 8-pin thermally enhanced HSOIC PowerPAD™ package.

SIMPLIFIED SCHEMATIC

EFFICIENCY vs LOAD CURRENT

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

Eco-mode, PowerPAD, WEBENCH are trademarks of Texas Instruments.

PRODUCTION DATA information is current as of publication date.

Copyright © 2012–2013, 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.