Backup Battery Management Circuit

The LT1239 is a micropower backup battery manage- ment system for portable computers and instrumenta- tion. It contains two Regulators for regulating the battery voltage and memory voltage and a Comparator for switch- ing 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. The second Regulator also isolates the backup battery from the main 5V supply during normal operation when the memory is being pow- ered by the 5V supply. By Linear Technology Corporation
LT1239 's PackagesLT1239 's pdf datasheet

LT1239 Pinout, Pinouts
LT1239 pinout,Pin out
This is one package pinout of LT1239,If you need more pinouts please download LT1239's pdf datasheet.

LT1239 Application circuits
LT1239 circuits
This is one application circuit of LT1239,If you need more circuits,please download LT1239's pdf datasheet.

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