Description

The GS7660 is a monolithic CMOS switched capacitor

voltage converter, designed to be an improved direct

replacement of the popular ICL7660, MAX1044 and

LTC1044. They perform supply voltage conversions from

positive to negative for an input voltage range of +1.5V to

+6.0V to their negative complements of –1.5V to –6.0V.

Contained on the chip are a series Power Supply regula-

tor, Oscillator, control Circuitry and four Power MOS

Switches. The oscillator, when unloaded, oscillates at a

nominal frequency of 10 kHz, with an Input voltage of 5.0V.

This frequency can be lowered by the addition of an external

capacitor to the “Osc” terminal or overdriven by an external

frequency source.

An Oscillator “boost” function is available to increase the

oscillator frequency which will optimize performance of

certain parameters. The Lv input can be connected to

≤ 3V), or left

open for input voltages greater than 3V to reduce power

dissipation.

The GS7660 provides superior performance over earlier

designs by combining low output impedance and low qui-

escent current with high efficiency and by eliminating diode

voltage drop losses. The only external components

required are two low cost electrolytic capacitors.

8 Pin Dip

SO-8

Features

• Low output impedance ( typical 35

• Low quiescent current ( typical 36

• High power conversion efficiency ( typical 98% )

• Simple and accurate voltage conversion from

positive to negative polarities

• Improved latch-up protection

• No external diodes required

Applications

• – 5V supply from + 5V logic supply

• EIA/TIA – 232E and EIA/TIA – 562 power supplies

• Portable telephones

• Data acquisition systems

• Personal communications equipment

• Panel meters

• Handheld instruments

Typical Application Circuit

10

µF

C1

Required for

+

+

10

µF

C2

GS7660

Negative Voltage Converter

1

2

3

4

5

6

7

8

GS7660

Vishay

formerly General Semiconductor

Document Number 74819

www.vishay.com

24-May-02

1

New Product

Switched-Capacitor Voltage Converter