The LT®1239 is a micropower backup battery managementsystem for portable computers and instrumentation.It contains two regulators for regulating the batteryvoltage and memory voltage and a comparator for switchingbetween main power and backup power. The firstregulator provides a constant voltage charge for thebackup batteries and is adjustable from 3.75V up to 20V.An equalization amplifier combined with the first regulatorprovides precision charge equalization for a 2-celllithium-ion system. A second regulator with 4.85V outputprovides a regulated backup battery voltage to the memorywhen main power is lost. The second regulator alsoisolates the backup battery from the main 5V supplyduring normal operation when the memory is being poweredby the 5V supply.
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