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Charging and using at same Time

Felix Pregitzer
Prodigy 170 points
Other Parts Discussed in Thread: BQ24195L, BQ25895, BQ24195, BQ24295

Hey there,

I have to build a BMS.

At the end it must be possible to connect a 5V supply and the battery has to be charged and at the same time having a device plugged in and getting a 5V output (not necessarily 5V). And the whe I plug off the 5V suplly the device is getting the supply directly from accumulator (uninterruptible power supply). Battery Status would also be nice.

Do you have any recommendations?

  • 0
    TI__Genius 13700 points

    Hello Felix,

    There is not enough information in your post to make an effective recommendation, but from what I read I am going to make the leap and assume that you are wanting to create a single-cell 5V power bank that can serve as a UPS for some device.

    I also have no idea what you are looking for when you say battery status. Are you referring to state of charge?

    If my assessment is accurate and you need the output to the system to be close to 5V at all times you will need to look into one of the power bank family of chargers bq24195L, bq24195, bq24295, and bq25895.

    You would then connect your system to the PMID pin with the OTG feature enabled. This will result in 5V from VIN going to PMID and the system when a supply is plugged in and when the supply is removed if the OTG feature is enabled on a timescale on the order of milliseconds the charger will boost the battery voltage to 5V back to PMID, assuming the battery voltage is sufficient to support it.

    Let me know if what I described is even remotely close to what you were thinking.

    When it comes to battery status like I said above I need to know more before I can even comment on possible solutions.

  • 0 in reply to Ryan May
    Prodigy 170 points
    Hi Ryan,

    thanks for you reply.

    how much current can I draw from the power bank family chargers you suggested me?
  • 0 in reply to Felix Pregitzer
    TI__Genius 13700 points

    It ranges from about 1.5A to 4A with the proper selection of external components and and optimized layout.

  • 0 in reply to Ryan May
    Prodigy 170 points
    ok do you have the external parts and an optimized layout? Or how can I be sure to be able to draw more than 2A out of the devive?
  • 0 in reply to Felix Pregitzer
    TI__Genius 13700 points
    Hello Felix,

    I would recommend looking at the bq25895 EVM that would be a good place to start for information on component selection and layout.
  • 0 in reply to Ryan May
    Prodigy 170 points

    ok. Thanks a lot.

    Is there any possibility to get a EVM as a University?

  • 0 in reply to Felix Pregitzer
    TI__Genius 13700 points

    Hello Felix,

    You best path forward is to either purchasing the EVM through the TI Store here:

    Or

    Since you are are a student I would recommend looking into our university programs here:

    e2e.ti.com/.../