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Original question:

BQ77908A: Cell balancing for LiFePo4 (4s)

BQ77908A: Reverse cell(s) connection protection

Lukasz Przenioslo
Expert 2630 points
Part Number: BQ77908A
Other Parts Discussed in Thread: BQ40Z50, BQ34Z50,

Hello there,

We are planning to incorporate the BQ40Z50 for our design. We are now thinking production wise, how to protect the ready PCB from incorrectly mounted cells as the last step. Please consider the following block diagram from the DS:

What will happen if all 3 of the cells, or only some of them will be connected in reverse polarity? What impact will it have on the BQ34Z50 itself and the circuitry connected via PACK+ and PACK-?

I would appreciate all feedback!

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    TI__Mastermind 36500 points

    Hello Lukasz,

    The BQ40Z50 is handled by a different team than the BQ77908A, it is handled by the gauging team, which will be best able to assist you. Your current thread used the BQ77908A part, which is handled by the battery protectors team.

    Please create a new thread with the correct part, the BQ40Z50 so that the gauging team can help you with your question.

    I will close this thread.

    Best Regards,

    Luis Hernandez Salomon