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 30 mV or more and stops when the difference is nominally 0 mV. Cell balancing is enabled and disabled by the CB_EN pin.
Feature
- 2-Series Cell Secondary Protection
- Automatic Cell Imbalance Correction with External
Enable Control- ±30-mV Enable, 0-mV Disable Thresholds
Typical
- ±30-mV Enable, 0-mV Disable Thresholds
- 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 15 mA - 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
