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BQ24640 Charge Current requirements >10A

Pang
Expert 2415 points
Other Parts Discussed in Thread: BQ24640

Hi Ti,

I would like to check as found that BQ24640 max charge current is up to 10A. So does that mean that this IC cannot support charge current higher than 10A?

Is the limitation only in the internal gatedrive? Can add external components to increase the gate drive?

Please share your suggestions.

  • 0
    TI__Genius 11480 points

    Hi  N3T,

    You  are correct, the bq24640 cannot handle more than 10A. SRP-SRN cannot exceed 100mV, or you will damage the IC. If you would like to charge >10 A, placing two charging IC's in parallel is probably the best method.

  • 0 in reply to David Wiest Jr
    Expert 2415 points
    100mV is fixed. It is the Rsense that determines the current. If use lower Rsense at 6.8mohm it will able to obtain 14.7A. Any comments?
  • 0 in reply to Pang
    TI__Genius 11480 points

    N3t,

    The charging current is not set by 100mV/Rsr, it is set by

     

    This means  that for a 6.8mOhm sense resistor, you would need the voltage  on Iset to be 2V, which is the  max voltage  on the pin. You are correct though, that probably will not be the issue.

    My main concern would be that you are charging  way above the spec for the part (10A). We cannot tell you that the current  regulation loop will work at a current that  is  almost 50% larger than what is  specified in the datasheet. 

    At that current you also have to worry about thermal performance, and you  may run into troubles with the  IC overheating.

    I  would  advise against going past  the datasheet spec. If this is a commercial product, I would  strongly suggest going  the  safer route and using two in parallel. If  this is a one-off or DIY, then at the very least  proceed  with caution,  as  it may work, but not reliably.