DESCRIPTION

The CAT661 is a charge-pump voltage converter. It can invert a positive input voltage to a negative output. Only two external capacitors are needed. With a guaranteed 100mA output current capability, the CAT661 can replace a switching regulator and its inductor. Lower EMI is achieved due to the absence of an inductor.

In addition, the CAT661 can double a voltage supplied from a battery or power supply. Inputs from 2.5V to 5.5V will yield a doubled, 5V to 11V output.

FEATURES

■ Converts V+ to V- or V+ to 2V+

■ Low output resistance, 10Ω max.

■ High power efficiency

■ Selectable charge pump frequency of 25kHz or 135kHz; optimize capacitor size.

■ Low quiescent current

■ Pin-compatible to MAX660, LTC660 with higher frequency operation

■ Available in 8-pin SOIC, DIP and 0.8mm thin 4x4mm TDFN packages

■ Lead-free, halogen-free package option

APPLICATIONS

■ Negative voltage generator

■ Voltage doubler

■ Voltage splitter

■ Low EMI power source

■ GaAs FET biasing

■ Lithium battery power supply

■ Instrumentation

■ LCD contrast bias

■ Cellular phones, pagers