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new wireless design help with the BQ51050B

David Azoulay
Prodigy 250 points
Other Parts Discussed in Thread: BQ51050B, BQ24090, BQ51003, BQ51013B

Hi All,

Im starting a new design that need to include a wireless power charging.

Today i'm using the BQ24090 to charge my Li-Po  3.7V battery (charging current is limit to 100mA) the output of the  BQ24090  connected to my battery and to my system load (with LDO) in parallel .

On my new design i want to be able to charge the battery with wireless charger  and with USB adapter.

I'm considering to use the BQ51050B  but before i'm doing that i want to ask a few questions:

1. does the BQ51050B  compatible with Li-Po 3.7V battery(? and also if i can limit the charging current to 100mA?

2. Can i connect my system in parallel to the battery ?

3. if i want to be able to charge the battery with a USB adapter can i use the BQ51050B  alone ? or i need to add a separate battery charger ic?

Thanks

  • 0
    TI__Genius 14890 points

    David,

    The bq51050B is optimized for higher power levels (500mA - 1A).  It will work at 100mA, but its termination accuracy may not be as precise.

    A simpler way for you to add wireless power to your system might be to use the bq51003 wireless power receiver and keep the bq24090.  This could be less disruptive to your design and improve design time.  The bq51003 has the ability to use the USB input and wireless power input.  It will use the wireless power to supply the bq24090 if there is no USB source.  Once a USB source is applied, it will terminate power transfer from the wireless system and enable the USB charger as the source to the bq24090.

    Please see section 9.2.2 Dual POwer Path: Wireless Power and DC Input for details.  This is a very popular solution.

    Regards,

    Dick

  • 0 in reply to Dick Stacey
    Prodigy 250 points
    Hi Dick,

    Thank you for your quick respond.

    At first I thought to use the bq51050B because he including a li-po charger ( i wanted to not use an external IC charger) ..but i saw on the data sheet that although he have a internal charger ill need to use an external charger for wired charging ....

    The bq51003 as 0.5 A as an output current, i think to use the BQ51013B ( i want to save the ability to change the design for higher current)

    just for general knowledge if the bq51050B is optimized for higher power levels (500mA - 1A). how can i limit the charging current (at the constant current stage) to 100mA?


    thanks
  • 0 in reply to David Azoulay
    TI__Genius 14890 points

    David,

    The bq51003 and bq51013B are pin-pin compatible so using either one will work.  As you noted, using the bq51013B allows you to get higher power transfer.

    Setting the charge current on the bq51050B is done with the ILIM pin.  It can be set very to 100mA without issue.  The distribution of the termination current will spread out as the termination current is lowered. But, setting the nominal currents below 500mA is the same as above 500mA.

    Regards,

    Dick