General Description
The MAX877/MAX878/MAX879 are pulse-skipping, step-up/step-down DC-DC converters that provide a regulated output from inputs both above and below the output. They require only three external components—an inductor (typically 22µH) and two filter capacitors.

Features
♦ Regulates from Inputs Above & Below the Output
♦ 1V to 6.2V Supply-Voltage Range
♦ Internal 1A Active Rectifier with Input-to-Output Disconnect in Shutdown
♦ Up to 210mA Load Currents, Guaranteed
♦ 85% Efficiency
♦ Only 3 External Components
♦ Adjustable Current Limit
♦ 195µA Quiescent Supply Current
♦ 20µA Shutdown Supply Current
♦ 3V/3.3V/5V and Adjustable Output Voltage Versions
♦ Available in 8-Pin DIP and SO Packages

Applications
    Two or Three NiCd Cells to 3V/3.3V Conversion
    Three or Four Alkaline Cells to 5V Conversion
    One Lithium Cell to 3V/3.3V Conversion
    Pagers
    Palmtop and Notebook Computers
    Battery-Powered and Hand-Held Instruments