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High-side n-channel FET driver

 

Features for the BQ76200

 

  • CHG and DSG high-side NMOS FET drivers for battery protection fast FET turn-on and turn-off times
  • Pre-charge PFET driver (for current-limited pre-charge of significantly depleted cell-pack)
  • Independent digital enable control for charging and discharging
  • Minimal external components needed
  • Scalable external capacitor-based charge pump to accommodate a different range of FETs in parallel
  • High-voltage tolerant (100-V absolute maximum)
  • Internal switch to enable pack-voltage sensing
  • Common and separate charge and discharge path configuration support
  • Designed to work directly with bq76940, bq76930, and bq76920 battery monitors
  • Current consumption:
    • NORMAL mode: 40 µA
    • SHUTDOWN: < 10 µAmaximum

 

Description for the BQ76200

 

The bq76200 device is a low-power, high-side, N-channel system. Ahigh-side protection avoids ground disconnection in the system and also allows continuouscommunication between the battery pack and host system. The device has additional P-Channel FETcontrol to allow low-current pre-charge to a deeply depleted battery, and a PACK+ voltage monitorcontrol for the host to sense the PACK+ voltage.

The independent enable inputs allow CHG and DSG FETs to be turned onand off separately, offering great implementation flexibility in battery systems.

The bq76200 device can be used with a companion analog front end (AFE)device such as the bq76920/30/40 family, a 3-series to 15-series Cell Analog Front End Monitoring,and a host microcontroller or dedicated state-of-charge (SOC) tracking gas gauge device.