• 2-Series Cell Secondary Protection

• Automatic Cell Imbalance Correction with External Enable Control

• ±30-mV Enable, 0-mV Disable Thresholds Typical

• External Capacitor-Controlled Delay Timer

• External Resistor-Controlled Cell Balance Current

• Low Power Consumption ICC < 3 μA Typical (VCELL(ALL) < VPROTECT)

• Internal Cell Balancing Handles Current up to 15mA

• External Cell Balancing Mode Supported

• High-Accuracy Overvoltage Protection:

• ±25 mV with TA = 0°C to 60°C

• Fixed Overvoltage Protection Thresholds: 4.30 V, 4.35 V

• Small 8L DRB Package

The bq2920x device 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 bq2920x 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 0 mV. Cell balancing is enabled and disabled by the CB_EN pin.