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CONTENTS

DESCRIPTION

1

2

3

4

19

18

17

16

SYNC

PGD

LVBP

RT

SA−

SAO

GND

SS

TPS40075

15

14

13

12

KFF

ILIM

VDD

HDRV

5

6

7

8

FB

COMP

PGND

LDRV

9

DBP

20

SA+

10

SW

11

BOOST

SYNC IN

PowerGood OUT

UDG−04075

(at Load)

(at Load)

TPS40075

SLUS676 – MAY 2006

MIDRANGE INPUT SYNCHRONOUS BUCK CONTROLLER

WITH VOLTAGE FEED-FORWARD

The TPS40075 drives external N-channel MOSFETs

using second generation Predictive Gate Drive to

•

Operation Over 4.5-V to 28-V Input Range

minimize conduction in the body diode of the low

•

Fixed-Frequency Voltage-Mode Controller

side

FET

and

maximize

efficiency.

Pre-biased

outputs are supported by not allowing the low side

•

Integrated Unity Gain Amplifier for Remote

FET to turn on until the voltage commanded by the

Output Sensing

closed loop soft start is greater than the pre-bias

•

Predictive Gate Drive™ Generation II for

voltage.

Voltage

feed

forward

provides

good

Improved Efficiency

response to input transients and provides a constant

•

<1% Internal 700-mV Reference

PWM gain over a wide input voltage operating range

to ease compensation requirements. Programmable

•

Input Voltage Feed Forward Control

short circuit protection provides fault current limiting

•

Prebiased Output Compatible

and hiccup recovery to minimize power dissipation

•

Internal Gate Drive Outputs for High-Side and

with a shorted output. The 20 pin QFN package

Synchronous N-Channel MOSFETs

gives good thermal performance and a compact

footprint.

•

Switching Frequency Programmable to 1 MHz

•

20-Pin QFN Package

SIMPLIFIED APPLICATION DIAGRAM

•

Thermal Shutdown Protection

•

Software Design Tool and EVM Available

•

Power Modules

•

Networking/Telecom

•

Industrial

•

Servers

Device Ratings

2

Electrical Characteristics

4

Terminal Information

12

Application Information

15

Design Example

26

Additional References

40

The TPS40075 is a mid voltage, wide input (4.5-V to

28-V), synchronous, step-down controller, offering

design flexibility for a variety of user programmable

functions, including; soft start, UVLO, operating

frequency, voltage feed-forward and high-side FET

sensed short circuit protection.

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.

Predictive Gate Drive is a trademark of Texas Instruments.

PRODUCTION DATA information is current as of publication date.

Copyright © 2006, 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.