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BQ51013: Questions about wireless reveicer and battery charging

user6264922
Prodigy 30 points
Part Number: BQ51013B
Other Parts Discussed in Thread: BQ24040, , BQ24072

Hello, sorry for quite beginner questions, but could you please help me out with these?

I am thinking about wireless receiver + Li-Pol charger for my project. I will have small two-wired 270mAh Li-Pol battery without NTC and I need to be able to charge while also powering my device.

I have already been searching quite long for something and found the BQ51013B Qi receiver and the BQ24040 charger. Are these ok for my needs? I have never dealt with charging circuits before so I rather came to ask.

Also I am slightly confused by your terminology in the BQ24040 datasheet - there is written about "fast charging" - is it just the TI's terminology for normal charging? I have always thought about "fast charging" as of for example Qualcomm's quick charge so.. But I believe your "fast charging" is like normal charging for me, right?

But to my very main questions:

  • I should limit charger's output current to battery, right?
  • Can I just pull the BQ24040's ISET2 to High without worrying about anything?
  • Should I take care of anything else I didn't mention here?

Thank you in advance!

It's really just my hobby project for learning something new so if something fails, it will not cause anything to anyone.

  • 0
    TI__Genius 12475 points

    Hello,

    If you need to be able to charge and power your system at the same time, you might look into BQ24072 family of devices which has powerpath. 

    I am not sure if fast charging is trademarked but typically I have seen fast charging being mentioned when >1C of charge current is being pumped into the battery itself. 

    A powerpath device will be able to control the precise amount of current going into the battery independent of the system load. On a non-powerpath device load transients can vary the actual charging current- great for applications being dropped into a cradle while system consumes very little current if any- 

    Regards,

    Gautham

  • 0 in reply to Gautham
    TI__Genius 12475 points

    Hello,

    Let us know if you have any questions on this thread. 

    Regards,

    Gautham