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BQ24600: BQ24600 5 cell Li-Ion reference design

Larry Gunseor
Intellectual 340 points
Part Number: BQ24600

I see from your reference design that you have 28V input to get 21V output to charge a 5 cell Li-Ion battery.  I would like to utilize this design but have a 24Vdc input, can I still obtain the 21V output for the 5 cell Li-Ion battery pack.  Don't need the full 3A will probably be charging at 2 to 2.5 Amps.

  • 0
    TI__Mastermind 24075 points

    Hi Larry,

     Yes you can. As this is a buck charger, there is a certain threshold that input voltage needs to be maintained above output voltage for the part to switch. Please refer to the SLEEP threshold in the datasheet. After accounting for voltage drop across any input reverse blocking FET, input trace impedance etc, the voltage on VCC pin of actual charger IC should be used to verify whether or not VCC is above VSRN by SLEEP threshold.

    You will be able to test on the EVM if you want to observe behavior before laying out your board.