BQ29209 (ACTIVE)

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

Voltage Protection with Automatic Cell Balance For 2-Cell Li-Ion Batteries, OVP=4.30V - BQ29209


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.


  • 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

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Parametrics Compare all products in Battery Monitor, Protection & Authentication Solutions

Number of Series Cells (Min)
Number of Series Cells (Max)
Communication Interface
Typical Operating Current (Typ) (uA)
Vin (Max) (V)
BQ29209 BQ29200 BQ29209-Q1
Protection    Protection    Protection   
2    2    2   
2    2    2   
No Communication    No Communication    No Communication   
Cell Balancing
Over-voltage (OV)   
Cell Balancing
Over-voltage (OV)   
Cell Balancing
Over-voltage (OV)   
3    3    3   
Catalog    Catalog    Automotive   
10    10    16   
8SON    8SON    8SON   

Other qualified versions of BQ29209

Version Part Number Definition
Automotive BQ29209-Q1 Q100 devices qualified for high-reliability automotive applications targeting zero defects