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BQ76200: Drive capacity

Fabio Gou
Intellectual 2970 points
Part Number: BQ76200
Other Parts Discussed in Thread: BQ76952

The below is the datasheet FET driver part of BQ76200 and BQ76952.

It seems the drive capacity of BQ76952 is better than BQ76200?

If I use di=Cdv/dt to estimate.

If it is, there is no need to use another BQ76200 when using BQ76952?

  • 0
    TI__Mastermind 33110 points

    Hello Fabio,

    There is no need to use the BQ76200 with the BQ76952. Yes, the circuitry for the BQ76952 is more recent, so it was likely better optimized.

    In fact, many of our customers actually find that the BQ76952's drivers are too fast (It does not take much drive current to turn-off the FETs quickly). If the turn-off is too quick, then that can excite the inductances in the traces/battery and cause very large voltage transients if not careful enough. This can be controlled with the pin resistance, so it is not a problem.

    If many FETs are used in parallel, turn-off speed can decrease. However, the turn-off speed can still be enhanced, there are suggested circuits shown in the Multiple FETs with the BQ769x2 Battery Monitors application note.

    Best Regards,

    Luis Hernandez Salomon