General Description
The MAX8594/MAX8594A complete power-management chips for low-cost personal digital assistants (PDAs) operates from a 1-cell lithium-ion (Li+) or 3-cell NiMH battery. They include all regulators, outputs, and voltage monitors necessary for small portable devices while requiring a bare minimum of external components. Featured are three linear regulators, a boost DC-DC converter for LCD bias, an efficient 4MHz buck DC-DC converter for core power, a microprocessor (µP) reset output, and low-battery shutdown in a 0.8mm high thin QFN package.

Features
♦ Minimum External Components
♦ Efficient Step-Down DC-DC Powers CPU Core
♦ 1V/1.3V Selectable Core Voltage, 400mA (MAX8594)
♦ 1.3V/1.8V Selectable Core Voltage, 400mA (MAX8594A)
♦ Main LDO 3.3V, 500mA
♦ SD Card Output 3.3V, 500mA
♦ Second Core LDO 1.8V, 50mA
♦ High-Efficiency LCD Boost
♦ LCD 0V True Shutdown when Off
♦ 46µA Quiescent Current

Applications
    PDAs
    Organizers
    Cellular and Cordless Phones
    MP3 Players
    Handheld Devices