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Genearl BQ24041 Question

Ramon Jimenez40
Prodigy 40 points
Other Parts Discussed in Thread: BQ24041, BQ24040, BQ25100

Hello!

I had a quick question I was hoping someone could assist me with. I am designing a wearable (think fitbit) for my Senior Design project and was looking at battery chargers. The battery that I am hoping to use has a max charge current of 24mA. Could you point me in the right direction of an ideal IC you may have? I looked at the BQ24041 and was thinking of using that one since it has a 15mA max output? Am I reading this correctly? 

Any and all assistance would be appreciated!

Thank You in Advance!

- Ramon

  • 0
    TI__Mastermind 19820 points

    You might be able to use bq24040. The minimum charge current is 10mA. However, depending on your battery's termination requirement, the bq24040 can on have accurate termination around 5mA. 

    If you are able to use CSP package, then you can have a look at bq25100 which has termination current as low as 1mA.

  • 0 in reply to Jing Zou
    Prodigy 40 points

    Thank you for the response, Jing!

    I am looking at my data sheet for the battery and it doesn't have any information regarding the termination current. What exactly is that? I have attached the data sheet for your reference. It is my understanding that as long as the charge current is ok I should be fine?

    I appreciate all your assistance.GMB300910.pdf

  • 0 in reply to Ramon Jimenez40
    TI__Mastermind 19820 points
    Normally it is at 10% of the fast charge current. In the charger datasheet, it has sections explain the charging profile that you can refer to. If the datasheet does not specify, you can probably disable termination and let it charge up to full capacity. You can us TS pin on bq24040 to disable termination since it looks like your battery does not have a build in NTC thermistor anyway.
  • 0 in reply to Jing Zou
    Prodigy 40 points
    Thank you for all your help! I appreciate it!

    I will look at both parts and decide which one will be best with my team!