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BQ40Z50-R1: BQ40Z50-R1 schematic query

Star Xu
Genius 9645 points
Part Number: BQ40Z50-R1

Hi

My customer design with BQ40z50-r1, CMOS is two parallel CSD17577Q3A Vgs only 1.5V, can not charge.

Please help check the attached schematic.

BQ40Z50 3S2P电池组 电路图.pdf

Waiting for your reply.

Thanks

Star

  • 0
    TI__Guru** 105760 points

    Hello Star,

    Try increasing the capacitance on the PBI pin (pin 1) to around 10uF or a little higher. The charge pump that drives the gates draws it's power from this capacitor. Driving multiple gates could also cause a brown out for the gauge if the PBI capacitance isn't high enough.

    Sincerely,

    Wyatt Keller