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Modify BQ24450 EVM for high input voltage/charging current

Peter Tseng
Mastermind 6240 points
Other Parts Discussed in Thread: BQ24450

Is there any design tooling to make BQ24450 easy design?

My customer need 30Vdc input and 24Vdc and around 12Amp output for battery charging.

How can I find the tooling to calculate the necessary modifications based on BQ24450 EVM?

Thanks. 

  • 0
    TI__Guru**** 151080 points

    The datasheet provides an example design and calculations on page 14 and 15.  You can just change the numbers and rerun the math and get a new circuit that meets your specs.

    You will need to watch out for the power dissipation in your pass transistor which will be (Vin - Vbat) * Ichg.  This is very high for a 12A design.