General Description

The MAX860/MAX861 charge-pump voltage converters invert input voltages ranging from +1.5V to +5.5V, or double input voltages ranging from +2.5V to +5.5V. Because of their high switching frequencies, these devices use only two small, low-cost capacitors. Their 50mA output makes switching regulators unnecessary, eliminating inductors and their associated cost, size, and EMI. Greater than 90% efficiency over most of the load-current range, combined with a typical operating current of only 200µA (MAX860), provides ideal performance for both battery-powered and board-level voltage-conversion applications.

Features

♦ 8-Pin, 1.11mm High µMAX Package
♦ Invert or Double the Input Supply Voltage
♦ Three Selectable Switching Frequencies
♦ High Frequency Reduces Capacitor Size
♦ 87% Efficiency at 50mA
♦ 200µA Quiescent Current (MAX860)
♦ 1µA Shutdown Supply Current
♦ 600mV Voltage Drop at 50mA Load
♦ 12Ω Output Resistance

Applications

Portable Computers
Medical Instruments
Interface Power Supplies
Hand-Held Instruments
Operational-Amplifier Power Supplies