MAX865

19-0472; Rev 1; 7/97 Compact, Dual-Output Charge Pump _______________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 o 1.11mm-High µMAX Package o Compact: Circuit Fits in 0.08in2 o Requires Only Four Capacitors o Dual Outputs (positive and negative) o +1.5V to +6.0V Input Voltage o 20kHz (min) Frequency (above the audio range) MAX865 ______________Ordering Information PART MAX865C/D MAX865EUA TEMP. RANGE 0°C to +70°C -40°C to +85°C PIN-PACKAGE Dice 8 µMAX ________________________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 __________Typical Op...