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 75Ω 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