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BQ24610: Recommendation for design

Isaac Parsons
Intellectual 450 points
Part Number: BQ24610

Hi there, 

My company is working on a charger for a 144Ah, 3.65V battery. The battery can handle charge currents of up to 70A so I'm looking for something that could charge the battery at around 40A. I was looking at the BQ24610 and saw its charge current to be 10A. Is there anyway to enable to a higher charge current with some external circuitry or are there other parts more suited to our application?

Thanks

  • 0
    TI__Mastermind 24075 points

    Hi Isaac,

     It is not recommended to use BQ24610 for charge currents above 10A. The main reason is the integrated drivers for the switching FET would not have enough gate drive strength to drive the bigger FET that need to be rated for the current. Gate drive loss would be too large. Currently we do not have a charger in our portfolio that can charge at 40A.

  • 0 in reply to Kedar Manishankar
    Intellectual 450 points

    What about using multiple of the BQ24610 chips in parallel?

  • 0 in reply to Isaac Parsons
    TI__Mastermind 24075 points

    Hi Isaac,

       The constant voltage loop of the parallel chargers will fight each other, as they are all trying to regulate the output voltage, and this will cause unequal current sharing, and inaccurate charge termination, with inaccurate charge regulation voltage.

    One option would be to integrate a half bridge gate driver for the HIDRV and LODRV to boost the strength of the internal gate drive, and ground the PH pin and let the half bridge take care of the switching. This would enable you to drive FET that are rated for higher drain current (as these would have higher Qg (gate charge) that the internal gate driver normally would not be able to drive).

    Note that the above solution has not been verified, so validation of above solution would have to be taken on by you. As these parts are standalone, it has hard to have them in a master-slave configuration, where the parallel IC boost the current during the CC phase, and the master takes control of the CV phase. Here is a link to an app note with TI IC that have I2C capability and how they can be cascaded/paralleled. http://www.ti.com/lit/an/slyt651/slyt651.pdf