bq29209

Product Folder Sample & Buy Technical Documents Tools & Software Support & Community bq29200, bq29209 SLUSA52C – SEPTEMBER 2010 – REVISED MARCH 2016 bq2920x Voltage Protection with Automatic Cell Balance for 2-Series Cell Li-Ion Batteries 1 Features 1 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 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 2 Applications 2nd Level Protection in Li-Ion Battery Packs – Netbook Computers – Power Tools – Portable Equipment and Instrumentation – Battery Backup Systems 3 Description 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 correct...