Product details


Function Protection Number of series cells (Min) 2 Number of series cells (Max) 2 Communication interface No Communication Features Cell Balancing, Over-voltage (OV) Typical operating current (Typ) (uA) 3 Rating Automotive Vin (Max) (V) 16 Approx. price (US$) 0.31 | 1ku open-in-new Find other Battery protectors

Package | Pins | Size

VSON (DRB) 8 9 mm² 3 x 3 open-in-new Find other Battery protectors


  • 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 threshold:
    4.30 V
  • Small 8L DRB package
  • Automotive-qualified AEC Q100 grade two

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The BQ29209-Q1 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 BQ29209-Q1 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.

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Technical documentation

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Type Title Date
* Datasheet BQ29209-Q1 Voltage Protection with Automatic Cell Balance for 2-Series Cell Li-Ion Batteries datasheet (Rev. C) May 03, 2019
Technical articles Is a LiFePO4 or Lithium-ion battery better for eCall systems? Oct. 25, 2016
Technical articles Get to know your battery pack: Part 1 Sep. 28, 2015
Technical articles The importance of battery management for eCall systems Jul. 02, 2015

Design & development

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SON (DRB) 8 View options

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