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 100 mA 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 2.5 V to 5.5 V will yield a doubled, 5 V to 11 V output.

Features

• Converts V+ to V− or V+ to 2V+

• Low Output Resistance, 10 Ω Max.

• High Power Efficiency

• Selectable Charge Pump Frequency of 25 kHz or 135 kHz; Optimize Capacitor Size

• Low Quiescent Current

• Pin−compatible to MAX660, LTC660 with Higher Frequency Operation

• Available in 8−pin SOIC and DIP Packages

• These Devices are Pb−Free, Halogen Free/BFR Free and are RoHS Compliant

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