Battery Overvoltage Protection IC


Battery Overvoltage Protection IC

Battery Overvoltage Protection IC

The bq2946xy family of products is a secondary level voltage monitor and protector for Li-Ion battery pack systems. The cell is monitored for over voltage condition and triggers an internal counter once the OVP threshold is exceeded and after a fixed set delay the out is transitioned to a high level. The output is reset (goes low) if the cell voltage drops below the set threshold minus the hysteresis.

Device Uses
  • 2nd-Level Protection in Li-Ion Battery Packs in:
    • Tablets
    • Slates
    • Portable Equipment and Instrumentation
Features
  • Single-Cell Monitor for Secondary Protection
  • Fixed Programmable Delay Timer
  • Fixed OVP Threshold
    • bq294602 = 4.35 V with 4-s Delay Timer
    • bq294622 = 4.45 V with 4-s Delay Timer
    • bq294682 = 4.225 V with 4-s Delay Timer
    • bq294604 = 4.35 V with 6.5-s Delay Timer
    • bq294624 = 4.45 V with 6.5-s Delay Timer
    • bq294684 = 4.225 V with 6.5-s Delay Timer
  • High-Accuracy Overvoltage Protection:
    ± 10 mV
  • Low Power Consumption ICC ≈ 1 µA

    (VCELL < VPROTECT)

  • Low leakage current per cell input < 100 nA
  • Small package footprint
    • 6-pin SON

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