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