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TPS62086 High current 3.3V and ? charging solution for Qi and USB with OTG output

Chris Hamilton
Intellectual 270 points
Other Parts Discussed in Thread: BQ24392, BQ24295, BQ51013B, TPS62086, BQ51050B

Hi, I am building some modular boards for prototyping.  I have designed a USB based solution for 3.3V using a BQ24392 negotiating high current for a TPS62086.  Now I would like to add a compatible optional battery module that is a complete Qi receiver, battery, and charger 'in a box'.  I can provide the 5V line from the USB as well as negotiation signals from the BQ24932 and obviously the 3.3V for the system.  I know there are dual input chargers and that combined with a BQ51013B would work for all but OTG output.  What I am wondering though, would I need a simple buckup for the OTG then?  Is there any safe/cheaper way to utilize something like a BQ24295 and some isolation logic to allow for charging by Qi if present, otherwise USB charging or OTG supply?  Is it better to utilize a BQ51050 for Qi and have two chargers?

  • 0
    TI__Genius 14890 points

    Chris,

    I can't answer all of the charger questions, but I can give assist with the wireless power.

    Based on the complexity of your system, I would advise using the stand-alone bq51050B wireless power receiver and charger for this application.  This device is very good for up to 5W 4.2V LiIon battery charging.  

    I don't know if that helps with the overall answer.  If you have specific questions about the wireless charging solution, start a new post on the Wireless Power Forum.

    Regards,

    Dick

  • 0 in reply to Dick Stacey
    Intellectual 270 points

    Thanks, I think I am leaning that way as well.  It just seems inefficient in board space and redundancy if not cost (since all Qi components are about the same price).  With that solution I still have the problem of selecting power for the TPS62086.  I don't think it would be wise to mix battery output and USB 5V on the same traces to power it nor run an OTG boost as the source of the TPS62086 when on battery accidentally or intentionally.  It sounds like I'll need to add some switching logic to the USB Power board either way.