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