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Automotive voltage protection with automatic cell balance for 2-cell li-ion batteries, OVP=4.30V

Availability: 5,905


Package | PIN: VSON (DRB) | 8
Temp: T (-40 to 105)
Package qty | Carrier: 3,000 | LARGE T&R
Custom reel may be available
Qty Price
1-99 $0.77
100-249 $0.66
250-999 $0.44
1,000+ $0.31


  • 2-series cell secondary protection
  • Automatic cell imbalance correction with external enable control
    • ±30-mV enable, 0-mV disable thresholdstypical
  • 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 mVwith 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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Texas Instruments  BQ29209TDRBRQ1

The BQ29209-Q1 deviceis a secondary overvoltage protection IC for 2-series cell lithium-ion battery packs thatincorporates a high-accuracy precision overvoltage detection circuit and automatic cell imbalancecorrection.

The voltage of each cell in a 2-series cell battery pack is compared to a factoryprogrammed internal reference voltage. If either cell reaches an overvoltage condition, the OUT pinchanges from low to high state.

The BQ29209-Q1 canperform automatic voltage-based cell imbalance correction. Balancing can start when the cellvoltages are different by nominally 30 mV or more and stops when the difference isnominally 0 mV. Cell balancing is enabled and disabled by the CB_ENpin.