The bq29209-Q1 device from Texas Instruments is a secondary overvoltage protection IC for 2-series cell lithium-ion battery packs that incorporates a high-accuracy precision overvoltage detection circuit and automatic cell imbalance correction. The voltage of each cell in a 2-series cell battery pack is compared to a factory programmed internal reference voltage.
If either cell reaches an overvoltage condition, the OUT pin changes from low to high state.
The bq29209-Q1 can perform automatic voltage-based cell imbalance correction. Balancing can start when the cell voltages are different by nominally 30mV or more and stops when the difference is nominally 0mV. Cell balancing is enabled and disabled by the CB_EN pin.
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