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General Description

The MAX865 is a CMOS charge-pump DC-DC converter in an ultra-small μMAX package. It produces positive and negative outputs from a single positive input, and requires only four capacitors. The charge pump first doubles the input voltage, then inverts the doubled voltage. The input voltage ranges from +1.5V to +6.0V.

The internal oscillator is guaranteed to be between 20kHz and 38kHz, keeping noise above the audio range while consuming minimal supply current. A 75? output impedance permits useful output currents up to 20mA.

The MAX865 comes in a 1.11mm-high, 8-pin μMAX package that occupies half the board area of a standard 8-pin SOIC. For a device with selectable frequencies and logic-controlled shutdown, refer to the MAX864 data sheet.

Features

? 1.11mm-High μMAX Package

? Compact: Circuit Fits in 0.08in2

? Requires Only Four Capacitors

? Dual Outputs (positive and negative)

? +1.5V to +6.0V Input Voltage

? 20kHz (min) Frequency (above the audio range)

Applications

?? Low-Voltage GaAsFET Bias in Wireless Handsets

?? VCO and GaAsFET Supplies

?? Split Supply from 3 Ni Cells or 1 Li+ Cell

?? Low-Cost Split Supply for Low-Voltage

????? Data-Acquisition Systems

?? Split Supply for Analog Circuitry

?? LCD Panels