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Tida-00329

Francesco Buffa
Prodigy 100 points
Other Parts Discussed in Thread: BQ51050B, BQ51003, TIDA-00668, TIDA-00881

Hi,

I would like to try the Tida-00329 solution for wireless power plus battery charging.

Which coil value is indicated for this example? I need to use a pcb one, any suggestion regarding size, layers, traces width,...?

The battery to be charged is not bigger than 150mAh.

Thanks,

Francesco

  • 0
    TI__Genius 14890 points

    Francesco,

    The WR222230-26M8-G coil from TDK is 27uH.  Are you using a bq51003 (power supply) or a bq51050B (with integrated charger)?

    For Layout considerations, I suggest looking at the Layout section of the bq51050B datasheet.  In general, our EVMs are build with 4-layer PCBs.  The bq51050B charge termination accuracy can have a wide distribution at low currents.  I can give more details if needed.

    Regards,

    Dick

  • 0 in reply to Dick Stacey
    Prodigy 100 points

    Hi Dick,

    thanks for your reply.

    I would like to use the bq51050B with integrated charger (the battery to charge is rated 240mAh).

    The questions regarding the layout are related more to the coil, because I don't have much space and I would like to avoid to add the coil as an extern component if possible. If I use a pcb coil on the receiver side, should it be the same on the transmitter?(I was thinking to work with the TIDA-00415)

    Thanks,

    Francesco

  • 0 in reply to Francesco Buffa
    TI__Genius 14890 points

    Francesco,

    PCB coils have been used, but in general tend to be lower efficiency.  TIDA-00668 is an example of a booster pack made with the bq51003 using a PCB coil.  Compare it to TIDA-00881 which uses a traditional coil.

    The TIDA-00415 uses a 20mm coil.  Using the coil mentioned in the previous post would be a good match (it is 20mm as well).

    If you do use a PCB coil on the RX side, that will not impact the coil on the TX side.

    Regards,

    Dick