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MAX847 Datasheet 1-cell / Step-up Two-way Pager System Ic

Manufacturer: Maxim Integrated (now Analog Devices)

Overview: 19-1349; Rev 1a; 10/98 L MANUA ION KIT HEET T A U L EVA TA S WS DA FOLLO 1-Cell, Step-Up Two-Way Pager System.

General Description

The MAX847 is a complete power-supply and monitoring system for two-way pagers or other low-power digital communications devices.

It requires few external components.

Included on-chip are: • A 1-cell input, 80mA output, synchronous-rectified boost DC-DC regulator with a digitally controlled +1.8V to +4.9V output • Three low-noise linear-regulator outputs • Three DAC-controlled comparators for softwaredriven 3-channel A/D conversion • SPI™-compatible serial interface • Reset and low-battery (LBO) warning outputs • Charger for NiCd, NiMH, lithium battery, or storage capacitor for RF PA power or system backup • Two 1.8 Ω (typical) serial-controlled open-drain MOSFET switches An evaluation kit for the MAX847 (MAX847EVKIT) is available to aid in design and prototyping.

Key Features

  • o 80mA Output from 1 Cell at 90% Efficiency o 13µA Idle Mode™ (coast) Current o Selectable Low-Noise PWM or Low-Current 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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