General Description

The MAX1774 is a complete power-supply solution for PDAs and other hand-held devices. It integrates two high-efficiency step-down converters, a boost converter for backup battery regulation, and four voltage detectors in a small 32-pin QFN or 28-pin QSOP package.

Features

♦ Dual, High-Efficiency, Synchronous-Rectified Step-Down Converters

♦ Thin, Small (1mm High) QFN Package

♦ Step-Up Converter for Backup Battery

♦ Main Power

Adjustable from +1.25V to +5.5V

Over 2A Load Current

Up to 95 Efficiency

♦ Core Power

Adjustable from 1V to 5V

Internal Switches

Up to 1.5A Load Current

Up to 91 Efficiency

♦ Automatic Main Battery Switchover

♦ 100 (max) Duty Cycle

♦ Up to 1.25MHz Switching Frequency

♦ Input Voltage Range from +2.7V to +28V

♦ Four Low-Voltage Detectors

♦ 170µA Quiescent Current

♦ 8µA Shutdown Current

♦ Digital Soft-Start

♦ Independent Shutdown Inputs

Applications

Hand-Held Computers

PDAs

Internet Access Tablets

POS Terminals

Subnotebooks