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BQ76PL455A-Q1: 96V solution, taking into consideration Vmax of TOP pin

Milan Dave1
Prodigy 20 points
Part Number: BQ76PL455A-Q1

Hi,

I am using bq76PL455A-Q1 within an active BMS design for a 96V battery pack (30 cells). However, I'm a little confused as to how (if) these chips could be stacked. TOP pin has an absolute maximum rating of 88V, how would I get around this using 2 chips?

Thank you kindly.

  • 0
    TI__Genius 17370 points

    Hi Milan,

    This spec refers to the abs max voltage across the device locally. (i.e. TOP to GND of the individual device where the GND of the 2nd device is floating at the level equal to the TOP pin of the first device) However you can still stack them and the potential to 'earth gnd' technically would be much higher.

    Regards,

    Taylor

  • 0 in reply to Taylor Vogt
    Prodigy 20 points

    Thank you for the answer Taylor! Would I need to differentiate between analog and digital grounds? Or would they both be relative?

  • 0 in reply to Milan Dave1
    TI__Genius 17370 points

    The different GNDs dont really apply here (so they are both relative) as they are only important for internal references and connecting certain components/layout of each individual device. More details on this is in the datasheet and section 10 for layout guidelines.

    Regards,

    Taylor