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BQ24610 Current

Owais Naeem
Prodigy 30 points
Other Parts Discussed in Thread: BQ24610

Hello,

With 9V input and 8.4V (2 cell Li-ion) output, will the BQ24610 give 10A charging current? with Rsns=10 mohm?? 

Waiting for reply 

Thanks!!!

  • 0
    TI__Expert 5565 points
    With a 9V input and a 8.4V output, there may not be enough headroom for converter operation at 10A charging current. If we look at the components that contribute to I*R losses in the bq24610 EVM, there will most likely be ~0.6V during the cycle where the high side FET is conducting (10mOhms from each sense resistors, 24mOhms from the high side FET Rdson, 18mOhms from the inductor DCR ==> 62mOhms * 10A = 620mV voltage drop).

    It is recommended to use a 12V supply or higher for a 8.4V output and 10A charging current. This should give you enough headroom for the converter such that you don't need to pick large/expensive low resistance components for the design.
  • 0
    TI__Expert 5565 points
    Additionally, VCC - SRN >= 650mV for charging to initiate (SRN = battery voltage). See page 5 of the datasheet, under section labeled SLEEP COMPARATOR.