General Description

The MAX769 is a complete buck/boost power supply and monitoring system for two-way pagers or other lowpower digital communications devices.

Features

♦ Regulated Step-Up/Step-Down Operation

♦ 80mA Output from 3 Cells

♦ 85 Efficiency

♦ 13µA Idle Mode™ (coast) Current

♦ Selectable Low-Noise PWM or Low-Current PFM Operation

♦ PWM Operating Frequency Synchronized to Seven Times an External Clock Source

♦ Operates at 270kHz with No External Clock

♦ Automatic Backup-Battery Switchover

Applications

    Two-Way Pagers

    GPS Receivers

    2 or 3-Cell Powered, Hand-Held Equipment