BQ77915

• Ultra-low quiescent current: 8 µA typ. (NORMAL mode), 2 µA (HIBERNATE mode)
• Full suite of voltage, current, and temperature protections
• Smart passive cell balancing removes cell-to-cell imbalance
• Scalable cell count from 3 series to 20 series or more
• Voltage protection (accuracy ±10 mV for OV, ±18 mV for UV)
  • Overvoltage: 3 V to 4.575 V
  • Undervoltage: 1.2 V to 3 V
• Open cell and open-wire detection (OW)
• Current protection
  • Overcurrent discharge 1: –10 mV to –85 mV
  • Overcurrent discharge 2: –20 mV to –170 mV
  • Short-circuit discharge: –40 mV to –340 mV
• Temperature protection
  • Overtemperature charge: 45°C or 50°C
  • Overtemperature discharge: 65°C or 70°C
• Additional features:
  • Independent charge (CHG) and discharge (DSG) FET drivers
  • Smart cell balancing algorithm with integrated FETs (up to 50-mA balancing current), also supports external FETs for higher cell-balancing current
  • Ultra-low power HIBERNATE mode
  • High 36-V absolute maximum rating per cell input
  • Resistor programmable overcurrent (OCD1/2) delay
• SHUTDOWN mode: 0.5-µA maximum
• Functional Safety-Capable
  • Documentation available to aid functional safety system design

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The BQ77915 device is a low-power battery pack protector that implements a suite of voltage, current, and temperature protections and a smart cell balancing algorithm without microcontroller (MCU) control. The device’s stackable interface provides simple scaling to support battery cell applications from 3 series to 20 series or more. Protection thresholds and delays are factory-programmed and available in a variety of configurations. Separate overtemperature and undertemperature thresholds for discharge (OTD and UTD) and charge (OTC and UTC) are provided for added flexibility.