2

3

4

5

15

14

13

12

VID3

HDRV

SW

BOOT

VID0

REF

EN

FB

TPS40197

6

11

LDRV

COMP

1

16

7

10

BP

VDD

VID1

VID2

8

9

PGOOD

GND

VID3

VID2

VID1

VID0

SD

V

OUT

V

OUT

V

IN

UDG-08100

HOST

V

IN

TPS40197

www.ti.com

SLUS886A – NOVEMBER 2008 – REVISED JULY 2012

SYNCHRONOUS BUCK CONTROLLER WITH 4-BIT VID INTERFACE

FOR SMART-REFLEX™ DSPs

1

FEATURES

CONTENTS

2

•

Input Voltage Range: 4.5 V to 14 V

Device Ratings

2

•

4-Bit Dynamic VID-On-The-Fly Support

Electrical Characteristics

4

•

VID Programmable Output Voltage with

Typical Characteristics

6

Programmable Transition Rate

Device Information

10

•

Fixed Switching Frequency of 520 kHz

Application Information

12

•

Selectable Low-Side (Three Settings) and

Design Example

18

Fixed High-Side Thermally Compensated

Additional References

20

Overcurrent Protection

•

Power Good Indicator

DESCRIPTION

•

Internal 5-V Regulator

The TPS40197 is a synchronous buck controller that

operates from 4.5 V to 14 V input supply nominally.

•

Voltage Mode Control

The

controller

implements

voltage-mode

control

•

Internally Fixed 5.5-ms Soft-Start Time

architecture with the switching frequency fixed at

•

Pre-Bias Output Safe

520 kHz. The higher switching frequency facilitates

•

Thermal Shutdown at 140°C

the use of smaller inductor and output capacitors,

thereby providing a compact power-supply solution.

•

16-Pin QFN Package

An adaptive anti-cross conduction scheme is used to

prevent shoot through current in the power FETs.

APPLICATIONS

The TPS40197 integrates the PWM control and 4-bit

•

Smart-Reflex™ DSPs

VID interface in a single chip to allow seamless on-

•

POL Modules

the-fly VID changes with programmable transition

•

Telecom

rate. It provides a simple power solution for Smart-

Reflex™ DSP cores.

TYPICAL APPLICATION CIRCUIT

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

SMART-REFLEX, Smart-Reflex, PowerPAD are trademarks of Texas Instruments.

PRODUCTION DATA information is current as of publication date.

Copyright © 2008–2012, 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.