Texas Instruments – Over-voltage protector with LDO output (bq296xyz family)
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.