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BQ76PL455A-Q1: current consumption in shutdown

Steffen Dase
Prodigy 155 points
Part Number: BQ76PL455A-Q1

We are using a single bq76pl455A-Q1 in our battery management application and like to reduce the current consumption in shutdown mode. The battery voltage is about 59V.

Is there any possibility to safely disconnect the bq76pl455 from the powersupply to safe more power, because the Current consumption with 22µA is to much for our application.

  • 0
    TI__Genius 11480 points
    Steffen,

    I cannot responsibly say there is a "safe" way to disconnect power from the pl455, as that was not the intention when the part was designed.

    If you cut power from TOP, then you will no longer be able to wake up the part until power is supplied again.

    What is your target current consumption? There may be other places to safe (ie lower Iq converters, getting more efficiency out of switchers through component selection, etc).
  • 0
    Prodigy 155 points
    Hello David,

    thank you for your reply.

    The part can cut from power and repowered from a µC. The question is, if this is allowed with the pl455.

    Our target current consumption is <10µA. In the shutdown mode everything else on the board, except the pl455, is already shut down and needs virtually no current.

    Regards

    Steffen
  • 0 in reply to Steffen Dase
    TI__Genius 11480 points
    Steffan,

    I would still say it is not a good idea...

    There should be back to back diodes from Vtop to BAT16. This is to help with hotplug/transient robustness and provides a redundant path to power the part if the TOP connection is broken.

    If you allow top to float, there is the possibility that the max voltage between Vtop and bat16 will be violated, damaging the part.

    I have to recommend not removing the VTOP connection while connected to cells....