TPS6755

ADJUSTABLE INVERTING DC/DC CONVERTER

SLVS155A – NOVEMBER 1996 REVISED DECEMBER 1996

1

POST OFFICE BOX 655303

PWM Controller

Supply Current to 1

µA

description

The TPS6755 is an adjustable inverting dc/dc converter capable of operating from inputs as low as 2.7 V. The

only external components required are an inductor, an output filter capacitor, an input filter capacitor, a reference

filter capacitor, two resistors, and a Schottky rectifier. An enable input is provided to shut down the inverter when

an output voltage 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 device features a 160-kHz current-mode pulse-width-modulation (PWM) controller with a p-channel

MOSFET power switch. The gate drive uses the converter 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 TPS6755 is attractive for board-level dc/dc conversion in computer peripherals and in battery-powered

equipment requiring high efficiency and low supply current.

Available in an 8-pin DIP or an 8-pin SOIC package, the TPS6755 operates over a free-air temperature range

of – 40

°C to 85°C.

EN

REF

SS

COMP

VCC

OUT

GND

FB

TPS6755

1

2

3

4

8

7

6

5

1

µF

+

47

µF

+

82 pF†

10

µF

10

µH

1N5817

100

µF

+

– 5 V

VI

2.7 V to 9 V

ENABLE

† Not required for loads of 100 mA or less

10.2 k

Ω

42.2 k

Ω

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

© 1996, Texas Instruments Incorporated