TPS6735

FIXED NEGATIVE 5-V 200-mA INVERTING DC/DC CONVERTER

SLVS141A – JULY 1996 – REVISED JANUARY 1997

1

POST OFFICE BOX 655303

PWM Controller

Supply Current to 1

µA

description

The TPS6735 is a fixed negative 5-V output inverting dc/dc converter capable of delivering 200 mA from inputs

as low as 4.5 V. The only external components required are an inductor, an output filter capacitor, an input filter

capacitor, a reference filter capacitor, and a Schottky rectifier. An enable input is provided to shut down the

inverter when a –5-V output is not needed. The typical supply current is 1.9 mA at no-load and is further reduced

to 1-

µA when the enable input is low.

The TPS6735 is a 160-kHz current-mode pulse-width-modulation (PWM) controller with a p-channel MOSFET

power switch. The gate drive uses the –5-V output to reduce the die area needed to realize the 0.4-

Ω MOSFET.

Soft start is accomplished with the addition of one small capacitor at SS. A 1.22-V reference is available for

external loads up to 125

µA.

The TPS6735 is attractive for board-level dc/dc conversion in computer peripherals and in battery-powered

equipment requiring high efficiency and low supply current.

The TPS6735 is available in 8-pin DIP and SOIC packages and operates over a free-air temperature range of

–40

°C to 85°C.

EN

REF

SS

COMP

VCC

OUT

GND

FB

TPS6735

1

2

3

4

8

7

6

5

1

µF

+

47

µF

+

82 pF†

10

µF

10

µH

1N5817

100

µF

+

– 5 V

VI

4 V to 6.2 V

ENABLE

† Not required for loads of 100 mA or less

Figure 1. Typical Circuit

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.

1

2

3

4

8

7

6

5

EN

REF

SS

COMP

OUT

GND

FB

D OR P PACKAGE

(TOP VIEW)

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.

Copyright

© 1997, Texas Instruments Incorporated