LT1239 Datasheet | Linear Technology

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 puters and instrumentation. It contains two regulators for regulating the battery voltage and memory voltage and a parator 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 bined 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...