The Texas Instruments (TI) bq296xyz family
offers high accuracy, low-powerover-voltage protectors with a 1mA
regulated output supply for Li-Ionbattery pack applications.
Each
cell in a 2-series to 4-series cell stack is individually monitored
foran over-voltage condition. An internally fixed-delay timer is
initiated upondetection of an over-voltage condition on any cell; upon
expiration of thedelay timer, an output pin is triggered into an active
state to indicatethat an overvoltage condition has occurred.
The
regulated output supply delivers up to 1mA (max) output current to
drivealways-on circuits, such as a real-time clock (RTC) oscillator. The
bq296xyzfamily has a self-disable function to turn off the regulated
output if anycell voltage falls below a certain threshold, thereby
preventing drain onthe battery, and provides an external control to
enable or disable theregulated output, says the company.