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FEATURES

CONTENTS

DESCRIPTION

APPLICATIONS

1

2

3

4

EN

FB

COMP

VDD

TPS40195

5

6

7

8

ULVO

RT

ILIM

GND

16

15

14

13

HDRV

SW

BOOT

LDRV

12

11

10

9

BP

SS_SEL

PGOOD

SYNC

Power Good

V

OUT

UDG-06066

TPS40195

SLUS720 – FEBRUARY 2007

4.5-V TO 20-V SYNCHRONOUS BUCK CONTROLLER WITH SYNCHRONIZATION AND

POWER GOOD

• Input Operating Voltage Range: 4.5 V to 20 V

Device Ratings

2

• Output Voltage as Low as 0.591 V ±0.5%

Electrical Characteristics

3

• 180° Bi-Directional Out-of-Phase

Typical Characteristics

5

Synchronization

Terminal Information

9

• Internal 5-V Regulator

Application Information

11

• High and Low MOSFET Sense Overcurrent

Design Example

20

Additional References

33

• 100 kHz to 600 kHz Switching Frequency

• Enable and Power Good

• Programmable UVLO and Hysteresis

The TPS40195 is a flexible synchronous buck

• Thermal Shutdown at 150°C

controller that operates from a nominal 4.5 V to 20 V

• Selectable Soft-Start

supply. This controller implements voltage mode

control with the switching frequency adjustable from

• Pre-Bias Output Safe

100 kHz to 600 kHz. Flexible features found on this

device

include

selectable

soft-start

time,

programmable

short

circuit

limit,

programmable

• Digital TV

undervoltage lockout (UVLO) and synchronization

• Entry-Level and Midrange Servers

capability. An adaptive anti-cross conduction scheme

• Networking Equipment

is used to prevent shoot through current in the power

FETs. Short-circuit detection is done by sensing the

• Non-Isolated DC-DC modules

voltage drop across the low-side MOSFET when it is

on, and comparing it with a user programmable

threshold.

SIMPLIFIED APPLICATION DIAGRAM

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.

PRODUCTION DATA information is current as of publication date.

Copyright © 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.