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  • TI Thinks Resolved

BQ25890H: Turning off RBFET and use reverse boost output from PMID

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Replies: 5

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Part Number: BQ25890H

Hi, 

I'm wondering if this chip can be used like BQ25895 where the boost output is on PMID only, and boost mode will automatically switch off when VBUS is attached to a charger? It seems like BQ25895 does not allow host to control D+/D- level.

If not, are there any USB switch with charger detection like BQ25890H but with charging functionality stripped?

Thanks.

  • Hi,

    With external circuitry, BQ25890H may have boost output at PMID only.

    Thanks,

    Ning.

    Please click "This resolved my issue" button if this post answers your question.

  • In reply to Ning T:

    Hi,

    Thanks for your response. What kind of external circuitry is needed?

  • In reply to Dennis Lee nanodesu:

    Hi,

    There's no reference circuitry available.

    Thanks,

    Ning.

    Please click "This resolved my issue" button if this post answers your question.

  • In reply to Ning T:

    As in, could you elaborate a little bit on what does that external circuitry do?
  • In reply to Dennis Lee nanodesu:

    Hey Dennis,

    You can use the BQ24195/L EVM reference schematic to implement a feature like this using external circuitry. You will notice the Power FET and Control FET tied to the VBUS pin and the input.
    www.ti.com/.../sluua18a.pdf


    Regards,
    Joel H

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