Ti Bq29442 Battery Power Charge Management Chip Voltage Monitor Protector Electronic Components Integrated Circuit IC.

• 2-Series, 3-Series, or 4-Series Cell Secondary Protection
• External Capacitor-Controlled Delay Timer
• Low Power Consumption I_CC < 2 µA Typical
  [V_CELL(ALL) < V_PROTECT]
• High-Accuracy Overvoltage Protection:
  ±25 mV with T_A = 0°C to 60°C
• Fixed Overvoltage Protection Thresholds:
  4.30 V, 4.35 V, 4.40 V, 4.45 V, 4.50 V
• Small 8L QFN Package
• APPLICATIONS
  • Second-Level Protection in Li-Ion Battery Packs
    • Notebook Computers
    • Power Tools
    • Portable Equipment and Instrumentation

The bq2944x is a secondary overvoltage protection IC for 2-series, 3-series, or 4-series cell Li-Ion battery packs that incorporates a high-accuracy precision overvoltage detection circuit.

FUNCTION

The voltage of each cell in a battery pack is compared to an internal reference voltage. If any cells reach an overvoltage condition, the bq2944x device starts a timer that provides a delay proportional to the capacitance on the CD pin. Upon expiration of the internal timer, the OUT pin changes from a low state to a high state. An optional latch configuration is available that holds the OUT pin in a high state indefinitely after an overvoltage condition has satisfied the specified delay timer period. The latch is released when the CD pin is shorted to GND.