General Description
The MAX1642/MAX1643 are high-efficiency, low-voltage, step-up DC-DC converters intended for devices powered by a single alkaline cell. They feature low quiescent supply currents and are supplied in the ultra-small µMAX package, which is only 1.1mm high. The guaranteed start-up voltage is 0.88V. Each device consists of an

Features
♦ Built-In Synchronous Rectifier
♦ 0.88V Guaranteed Start-Up
♦ Ultra-Small µMAX Package: 1.1mm High
♦ 83% Efficiency
♦ 4µA Quiescent Supply Current into BATT Pin
♦ 2µA Logic-Controlled Shutdown (MAX1642)
♦ Two Undervoltage Detectors (MAX1643)
♦ 2V to 5.2V Output Range
♦ 20mA Output Current at 1.2V Input
♦ Reverse Battery Protection

Applications
    Pagers
    Remote Controls
    Pointing Devices
    Personal Medical Monitors
    Single-Cell Battery-Powered Devices