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BQ25730: Buck only mode

Pawel Cern1
Prodigy 40 points
Part Number: BQ25730

Brief question. In my application, BQ25730 will work in buck only mode. Input voltage will be 24V, and there will be NiMH 6S battery pack at output (7,2V nominal voltage). Is it possible to simplify design by removing Q3 and putting wire instead of Q4? I mean MOSFETs driven by HIDRV2 / LODRV2?

  • 0
    TI__Genius 11385 points

    Hi Pawel,

    The charger uses the FETs for other functions. For example, the boost high side (Q4 on datasheet) blocks the current in case of input short. Due to the inherent body diode of the buck high side (Q1 on datasheet), the battery can discharge if the input is shorted. As opposed to other DC-DC converters where only some caps are available at the output, the presence of a high energy battery will require some mechanism to prevent accidentally discharge. Please have all 4 MOSFETs if you use the BQ25730.

    Thanks and I hope this helps,

    Peng

    *If my answer solves your question, please press "This Resolved My Issue" on the thread.  

  • 0 in reply to Pengzhao Zhu
    Prodigy 40 points

    Thank you for quick answer. In our case, additional ideal diode circuit is applied at input, so it shouldn't happen.

    Are there any more functions which can be affected / out of order?

  • +1 in reply to Pawel Cern1
    TI__Genius 11385 points

    Hi Pawel,

    Yes, there are functions that can be affected. Please have all 4 MOSFETs if you use the BQ25730.

    Thanks and I hope this helps,

    Peng

    *If my answer solves your question, please press "This Resolved My Issue" on the thread.