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LT1239 - Backup Battery Management Circuit

General Description

The LT ® 1239 is a micropower backup battery management system for portable computers and instrumentation.

It contains two regulators for regulating the battery voltage and memory voltage and a comparator for switching between main power and backup power.

Key Features

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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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LT1239 Backup Battery Management Circuit FEATURES s s s s s s s s s s s s DESCRIPTION The LT ® 1239 is a micropower backup battery management system for portable computers and instrumentation. It contains two regulators for regulating the battery voltage and memory voltage and a comparator for switching between main power and backup power. The first regulator provides a constant voltage charge for the backup batteries and is adjustable from 3.75V up to 20V. An equalization amplifier combined with the first regulator provides precision charge equalization for a 2-cell lithium-ion system. A second regulator with 4.85V output provides a regulated backup battery voltage to the memory when main power is lost.