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BQ25170: combination with BQ2970 functionality

user6067694
Prodigy 80 points
Part Number: BQ25170
Other Parts Discussed in Thread: BQ2973, BQ25150

Hi,

I need to charge a single 170 mAh Li-Ion battery and want to isolate it in case of overcurrent/overvoltage events. Using BQ25170 and BQ2973 looks most appropriate, but a combination of both in one part would be even better. But I cannot find a charger which also includes battery protection circuitry besides over voltage protection. The only reason I can think of to separate the battery protection circuitry is to avoid a single point failure which takes out the protection circuitry together with the chargers own limiters. Am I defeating the purpose of a separate battery protector when I want it to come with the charger? Or is there such a part and I did not find it?

Reagrds,

Peter

  • +1
    TI__Mastermind 31140 points

    Hi Peter, 

    The BQ25170 provides overvoltage and overcurrent protection during charging, but does not protect against overcurrent or undervoltage during battery discharge. There is not a linear charger product with build in protection to the level of the BQ2973. A linear charging device with powerpath such as the BQ25150 will offer a bit more battery protection, but it would still be a good idea to have a protector.

    In general the BQ25170 and similar devices provide protection during charging and are often turned off or in a low power state when not charging. The external battery protection device provides protection to the battery at all times. This difference is one reason the circuitry is kept separate.   

    Regards,

    Garrett

  • 0 in reply to Garrett Kreger
    Prodigy 80 points

    Hi Garrett,

    Thank you very much for your answer. That makes complete sense and I will use both parts in my new design.

    Regards,

    Peter