TPS40020

TPS40021

SLUS535C − MARCH 2003 − REVISED SEPTEMBER 2004

ENHANCED, LOW INPUT VOLTAGEMODE

SYNCHRONOUS BUCK CONTROLLER

8

FEATURES

Drivers for Higher Efficiency

Circuit Current Limit

100 KHz-to-1 MHz Voltage-Mode Control

Comparators with Power Good Indication

Provide Output Status

APPLICATIONS

DESCRIPTION

The TPS4002x family of dc-to-dc controllers are designed

for non-isolated synchronous buck regulators, providing

enhanced operation and design flexability through user

programmability.

The TPS4002x utilizes a proprietary Predictive Gate

Drive

 technology to minimize the diode conduction

losses associated with the high-side and synchronous

rectifier N-channel MOSFET transistions. The integrated

charge pump with boost circuit provides a regulated 5-V

gate drive for both the high side and synchronous rectifier

N-channel MOSFETs. The use of the Predictive Gate

Drive

 technology and charge pump/boost circuits

combine to provide a highly efficient, smaller and less

expensive converter.

Design flexibility is provided through user programmability

of such functions as: operating frequency, short circuit

current detection thresholds, soft-start ramp time, and

external

synchronization

frequency.

The

operating

frequency is programmable using a single resistor over a

frequency range of 100 kHz to 1 MHz. Higher operating

frequencies yield smaller component values for a given

converter power level as well as faster loop closure.

5

13

12

16

15

1

2

3

ILIM/

SYNC

VDD

OSNS

COMP

HDRV

BOOT2

PVDD

LDRV

VDD 2.25 V − 5.5 V

4

FB

11

BOOT1

TPS40020

6

SS/SD

7RT

8

SGND

VOUT

14

SW

PGND

10

PWRGD 9

VDD

VOUT

UDG−02094

PRODUCTION DATA information is current as of publication date. Products

conform to specifications per the terms of Texas Instruments standard warranty.

Production processing does not necessarily include testing of all parameters.

PowerPAD

 and Predictive Gate Drive are trademarks of Texas Instruments.

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.

www.ti.com

Copyright

 2004, Texas Instruments Incorporated