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 andDIP 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