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.
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
Feature
♦ 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
