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MAX847 - 1-Cell / Step-Up Two-Way Pager System IC

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.

A 1-cell input, 80mA output, synchronous-rectified boost DC-DC regulator with a digitally controlled

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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Full PDF Text Transcription (Reference)

The following content is an automatically extracted verbatim text from the original manufacturer datasheet and is provided for reference purposes only.

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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 IC ____________________________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 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.
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