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Does the BQ51051B only output 4.35 V?

Lucas Goedde
Prodigy 20 points
Other Parts Discussed in Thread: BQ51050B

Hi, I am trying to implement a wireless charging solution with a predetermined rechargeable battery that needs to be charged at 3.1 V. Will this chip regulate its output to 3.1 V or does it always supply a constant 4.35 V? 

  • 0
    TI__Genius 14890 points

    Lucas,

    The bq51050B has a charge termination at 4.2V.  What that means is it will go to whatever the battery voltage is and begin to charge.  As the battery approaches 4.2V, it will go into taper mode (current is reducing) until it reaches the termination current.  Based on this, the termination would not occur as normal taper, and the control would have to be external. There is a 10 hour maximum charge time as well.

    The bq5105XB wireless chargers have a precharge threshold of 2.9-3V.  That means, when the battery is below that threshold, it will be charging at a lower current.

    Is your battery specifically rated as a charge at 3.1V or is that the "nominal" voltage.  Review the battery specification to verify.

    Running a battery at full charge current at or above it's specified maximum voltage is not recommended.  Please review the battery specification very carefully.

    Regards,

    Dick

  • 0 in reply to Dick Stacey
    Prodigy 20 points

    Thanks for the quick reply!

    The nominal voltage for the battery is 3V. According to this datasheet, the charge voltage is 2.8 to 3.2 V with a standard of 3.1 V. Do you recommend using this chip to charge this battery?

    Thanks for your help!

    Lucas

  • 0 in reply to Lucas Goedde
    TI__Genius 14890 points
    Lucas,
    I just noticed this thread did not continue. How are you with this project?
    Regards,
    Dick