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Voltage Protection with Automatic Cell Balance For 2-Cell Li-Ion Batteries, OVP=4.30V

Availability: 15,600


Package | PIN: VSON (DRB) | 8
Temp: I (-40 to 85)
Carrier: Cut Tape
Qty Price
1-9 $0.79
10-24 $0.71
25-99 $0.65
100-249 $0.56
250-499 $0.52
500-749 $0.42
750-999 $0.34
1000+ $0.30


  • 2-Series Cell Secondary Protection
  • Automatic Cell Imbalance Correction with External
    Enable Control
    • ±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
  • 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

Texas Instruments  BQ29209DRBR

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.