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SS6660

Switched-Capacitor Voltage Converter

FEATURES

Low output impedance (typ. 35

Ω at

Improved direct replacement for 7660

Operation from 1.5V to 6V

No external diode required

Simple conversion from +5V to -5V

Low quiescent current (typ. 36

High power efficiency (typ. 98%)

Boost pin for higher switching frequency

Improved SCR latchup protection

APPLICATIONS

RS-232 Power Supplies

Handheld Instruments

Data Acquisition Systems

Operational Amplifier Supplies

Panel Meter

TYPICAL APPLICATION CIRCUIT

µ



VIN (1.5V to 6V)

Required for

≤ 3V





SS6660













µ



















Negative voltage converter

DESCRIPTION

The SS6660 is a monolithic CMOS switched-

capacitor voltage converter. Designed to be an

improved direct replacement for the popular 7660

and LTC1044, the main function of the SS6660

is to convert a positive input voltage in the range

of 1.5V to 6V to the corresponding negative

output voltage in the range of 11.5V to -6V.

examples.

The chip contains a series DC power supply

regulator, oscillator, control circuitry and four

output power MOSFET switches. The frequency

of the oscillator can be lowered by the addition of

an external capacitor to the OSC pin, or the

oscillator may be over-driven by an external clock.

This boost function is available to raise the

oscillator frequency to optimize performance in

specific applications. The "LV" terminal may be

≤ 3V) operation, or be left floating for input voltages

larger than 3V to improve power dissipation.

The SS6660 provides performance superior to

previous designs by combining low output

impedance, low quiescent current with high

efficiency and by eliminating losses from diode

voltage drops. The only external components

required are two low-cost electrolytic capacitors.

Rev.2.02 1/29/2004