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BQ25619: BQ25619

Jay Kacha
Prodigy 210 points
Part Number: BQ25619
Other Parts Discussed in Thread: BQ27427

Hello,

We have used BQ25619 in our battery charging. Right now we are not able to charge the battery, I am attaching the schematics below. Can someone please look into it?

Thanks,

Jay Kacha


0004_POWER SUPPL.pdf0005_FUEL GUAGE .pdf

  • 0
    TI__Mastermind 34865 points

    Hello Jay,

    My schematic review is as follows:

    1. Please bias the TS pin properly to ensure proper charging. Currently it looks like TS is biased at 85.2% of REGN which suspends charge. Please bias between T2 and T3 for full charge current and full charge voltage. You can use a fixed resistor divider at about about 53% of REGN.

    2. Please pull down CE/ pin to enable charge.

    Regards,

    Mike Emanuel

  • 0 in reply to Michael Emanuel35
    Prodigy 210 points

    Hello Michael,

    Thanks for your comments, much appreciated. For the 2nd comment I have given control to the MCU to make the CE pin drive low, will it be ok or make it low right now, and no need to give it to the MCU?

  • 0 in reply to Jay Kacha
    TI__Mastermind 34865 points

    Hello Jay,

    Driving CE/ low and setting CHG_CONFIG bit = 1 will enable charge.

    Regards,

    Mike Emanuel

  • 0 in reply to Michael Emanuel35
    Prodigy 210 points

    Hello Michael,
    Thanks for the information.

  • 0 in reply to Michael Emanuel35
    Prodigy 210 points

    Hello Michael,

    I have another question on my mind. please see the below image in which I have connected TS from the charger BQ25619 to the gauge BQ27427's BIN pin, if TS is biased with 53% then the voltage is 2.5V, and BIN pin's absolute maximum rating is 2.3V, will this affect the gauge?

  • 0 in reply to Jay Kacha
    TI__Mastermind 34865 points

    Hello Jay,

    In general if you apply above the ABS MAX rating for a pin, "Operation outside the Absolute Maximum Ratings may cause permanent device damage. Absolute Maximum Ratings do not imply functional operation of the device at these or any other conditions beyond those listed under Recommended Operating Conditions. If outside the Recommended Operating Conditions but within the Absolute Maximum Ratings, the device may not be fully functional, and this may affect device reliability, functionality, performance, and shorten the device lifetime."

    However, I do not know the specifics of the gauge as I work on the charger. Please open a new thread to ask the gauge team and mark this one closed.

    Regards,

    Mike Emanuel