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BQ25713EVM-017: Layout PGND vs GND

Paul_Marco
Prodigy 165 points
Part Number: BQ25713EVM-017
Other Parts Discussed in Thread: BQ25713

Hello,

We are looking to use the BQ25713EVM-017 as a reference design and embed it onto our production board, but have some questions:

1. Should we power the rest of our system from the VSYS/PGND port?  If so, what would this look like?

  • 0
    TI__Expert 5330 points
    Hello Paul,

    That is correct. You use SYS/PGND to power the system and the BQ25713 will automatically power the system from either the adapter or battery as appropriate, charging the battery simultaneously to powering the system when the adapter is attached, and discharging the battery if necessary to supplement the adapter.

    As for what it would look like, it really depends on your system. Often there is some form of post regulation to drop the system voltage to a usable power rail such as 3.3V, although if your system can run off of the full VSYS range, this isn't required.

    Regards,
    Steve
  • 0 in reply to Steve Preissig
    Prodigy 165 points

    Hi Steve,

    We pretty much replicated the exact layout from the EVM onto our board, complete with the right polygon pours and all that.

    My question is more in regards to how to lay out the copper for supplying the rest of our system. We do have downstream 12V boost and 5V buck.  Do we neck down at that VSYS/PGND port and split out to the rest of the system?

    Sorry this may be a feeble question, but we'd really like to get this right and I can't find any docs or other ref designs that could help out.

  • 0 in reply to Paul_Marco
    TI__Mastermind 25800 points
    Hey Paul,

    Just to step in here for Steve. In regards to laying out the copper for your downstream converters, you can neck down VSYS if you don't have tight space constraints. Having a larger copper pour will always be better to reduce your I2R losses. You can also size the VSYS pour based on the peak load of the downstream converters.

    I would suggest looking at this reference design: www.ti.com/.../PMP40441

    It has the hardware files, schematic, and layout plots to give you an idea where to start. That reference design has the buck-boost charger, a buck converter, and an LDO.


    Regards,
    Joel H