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BQ25895: BQ25895

Part Number: BQ25895

Good day,

I have been reading this post as I am busy with a similar application.

I want a typical 13.8V charger to charge my lithium batteries with a PMID output of 5V @ 3.1A.

With battery backup I still need the 5V @ 3.1A.

The power supply / charger will supply 5V to a raspberry PI and the Pi will be damaged if the PMID output goes above 5.2V and will reset below 4.8V.

I have been testing the following example and struggling to get the above working:

So the question:

Are there any registers that I can change during production to insure that the above will work as expected or will the registers always go back to default were PMID follows the VBUS voltage?

During production the test bench will be able to handle a wider voltage than the Pi and it can be setup there.

Kind Regards,

Kallie

  • Hello Kallie,

    If you're looking for a constant power supply it may be better to use the VSYS with a boost converter to power your RPI. As the other thread mentions the charger can only charger or do the boost mode operation.

    The PMID boost operation is more intended to charge a phone or other 5V device from the battery when it's not being charged.

    Sincerely,

    Wyatt Keller