TPS43000

SLUS489 − OCTOBER 2001

MULTITOPOLOGY HIGHFREQUENCY

PWM CONTROLLER

1

www.ti.com

FEATURES

Controller

Non-Synchronous Boost Topology)

Flyback (Buck-Boost) Topology

Applications

Automatic Pulsed Frequency Modulation

(PFM) Mode

Continuous Conduction Mode

Hiccup Mode Protection

TYPICAL BUCK APPLICATION

APPLICATIONS

DESCRIPTION

The TPS43000 is a high-frequency, voltage-mode,

synchronous PWM controller that can be used in buck,

boost, SEPIC, or flyback topologies. This highly flexible,

full-featured controller is designed to drive a pair of

external

MOSFETs

(one

N-channel

and

one

P-channel), enabling it for use with a wide range of

output voltages and power levels. With an automatic

PFM mode, a shutdown current of less than 1

µA, a

sleep-mode current of less than 100

µA and a full

operating current of less than 2 mA at 1 MHz, it is ideal

for building highly efficient, dc-to-dc converters.

The TPS43000 operates over a wide input voltage

range of 1.8 V to 9.0 V. Typical power sources are

distributed power systems, two to four nickel or alkaline

batteries, or one to two lithium-ion cells. It can be used

to generate regulated output voltages from as low as

0.8 V to 8 V or higher. It operates either in a

fixed-frequency mode, where the user programs the

frequency (up to 2 MHz), or in an automatic PFM mode.

In the automatic mode, the controller goes to sleep

when the inductor current goes discontinuous, and

wakes up when the output voltage has fallen by 2%. In

this hysteretic mode of operation, very high efficiency

can be maintained over a very wide range of load

current. The device can also be synchronized to an

external clock source using the dual function SYNC/SD

input pin.

UDG−01036

5

1

3

4

2

6

12

7

SYNC/SD

CCS

RT

CCM

BUCK

PFM*

COMP

FB

TPS43000

8

10

11

16

15

13

14

9

VIN

VOUT

NDRV

GND

PDRV

VP

SWP

SWN

RTN

VIN

VOUT

Copyright

 2001, Texas Instruments Incorporated

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.

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.