1

FEATURES

APPLICATIONS

CONTENTS

DESCRIPTION

SIMPLIFIED APPLICATION DIAGRAM

1

2

3

4

8

7

6

5

FB

COMP

VDD

TPS40040/1

GND

VOUT

VIN

EN

HDRV

SW

BOOT

LDRV

TPS40040, TPS40041

SLUS700D – MARCH 2006 – REVISED DECEMBER 2007

www.ti.com

LOW PIN COUNT, LOW VIN (2.5 V TO 5.5 V) SYNCHRONOUS BUCK DC-TO-DC

CONTROLLER WITH ENABLE

• Point of Load

23

• 2.25-V to 5.5-V Input

• Telecommunications

• Output Voltage from 0.6 V to 90% of VIN

• DC to DC Modules

• High-Side Drive for N-Channel FET

• Set Top Boxes

• Supports Pre-Biased Outputs

• Adaptive Anti-Cross Conduction Gate Drive

• 1%, 0.6-V Reference

• Two Fixed Switching Frequency Versions,

Device Ratings

2

TPS40040 (300 kHz) and TPS40041 (600 kHz)

Electrical Characteristics

3

• Three Selectable Short Circuit Protection

Device Information

8

Levels of 105 mV, 180 mV and 310 mV

Application Information

10

• Hiccup Restart from Faults

Design Examples

19

• Voltage Mode Control

• Active Low Enable

Additional References

32

• Thermal Shutdown Protection at 145C

• 8-Pin, 3-mm x 3-mm SON with Ground

Connection to Thermal Pad

The TPS40040 and TPS40041 dc-to-dc controllers

are designed to operate from a 2.25-V to 5.5-V input

source.

To

reduce

the

number

of

external

components, several operating parameters are fixed

internally; namely, frequency, soft start time, and

short circuit protection (SCP) levels. For example, the

operating

frequencies

of

TPS40040/1

are

300

kHz/600 kHz, respectively.

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

PowerPAD is a trademark of Texas Instruments.

3

Predictive Gate Drive is a registered trademark of Texas Instruments.

PRODUCTION DATA information is current as of publication date.

Copyright © 2006–2007, 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.