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MAX769 Datasheet 2 Or 3-cell / Step-up/down / Two-way Pager System

Manufacturer: Maxim Integrated (now Analog Devices)

Overview: 19-4771; Rev 1; 10/98 ANUAL N KIT M EET IO T A U EVAL TA SH WS DA FOLLO 2 or 3-Cell, Step-Up/Down, Two-Way Pager System.

General Description

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

Few external components are required.

Included on-chip are: • An 80mA output, synchronous-rectified, buck/boost DC-DC converter with a digitally controlled +1.8V to +4.9V output.

Key Features

  • o Regulated Step-Up/Step-Down Operation o 80mA Output from 3 Cells o 85% Efficiency o 13µA Idle Mode™ (coast) Current o Selectable Low-Noise PWM or Low-Current PFM Operation o PWM Operating Frequency Synchronized to Seven Times an External Clock Source o Operates at 270kHz with No External Clock o Automatic Backup-Battery Switchover ________________General.

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