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BQ2404x and BQ51013B suitable for wirelessly charging a small battery?

Samot No
Prodigy 20 points
Other Parts Discussed in Thread: TIDA-00318, BQ51013B, BQ51050B, BQ24040

Hi,

I want to built a wireless charger for a small battery (100mAh - 300mAh). I came across the BQ51050B, but I read it is not suitable for such small batteries. The suggested alternative is the TIDA-00318 solution, but it has ICs that are very difficult to solder by hand. Just to check, would a combination of the BQ51013B and BQ2404x be suitable for a small battery?

Also, is it possible to nicely shut down wireless power if charging is finished with this combination? The ~CHG and EN1 don't seem nicely compatible, or am I missing something? (If ~CHG starts low, I think it might work, but I'm not sure if it does).

Best regards,
Samot

  • 0
    TI__Guru 65846 points

    Hello

    The BQ24040 will work at low charge current but will depend on how low you need to go.  The BQ2510X is best.

    Option for turning off the wireless power after charge is complete: Best is to pull EN1 & 2 high -- This will send a charge complete to TX as soon as the RX powers up.

  • 0 in reply to Bill Johns
    Prodigy 20 points

    Hi Bill,

    Thank you for your fast response. As far as I can see, the BQ24040 will work up to a cut-off current of 2.5mA, right?

    I indeed understood that pulling EN1 and EN2 up will disable the wireless power. Can this be accomplished directly by the BQ24040 via one of its outputs, or is the intervention of, for example, a microcontroller needed? Is there still a voltage output somewhere on the BQ51013B when wireless charging is disabled?

    Best regards!

  • 0 in reply to Samot No
    TI__Mastermind 19195 points

    Hi Samot,

    Sorry for delayed response, The BQ24040  termination accuracy decreases at lower currents and may not detect termination resulting in a timer fault.

    For disabling wireless power, BQ24040 CHG output is not suitable for this as not charging and charge complete are both open drain, if this is needed best to do with MCU.

    Best,

  • 0 in reply to Nick Brylski
    Prodigy 30 points

    Hi Nick,

    Thanks for the info!

    Best regards,

    Samot