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Original question:

BQ25730: Info on Max Power capability

BQ25730: Charging BQ25730 with 28V

Duane Storey
Prodigy 60 points
Part Number: BQ25730
Other Parts Discussed in Thread: BQ25770G, BQ25773

Hi everyone,

I'm using the BQ2730 on a custom board for a project we're working on.  The PDF lists the max input voltage on VBUS to be 32V, and the recommended voltage to be 26V.  What isn't really defined is what happens in between those two voltages.

Given that many new USB-C PD devices can outpu 28V, is the charger safe to use at this voltage, even if perhaps it's non optimal. I feel like there is some abiguity with this device, and other forum questions related to it didn't do much to help clarify it.  Can you say unambiguously if using 28V as input for VBUS is acceptable please? 

Thank you.

  • 0
    TI__Mastermind 35235 points

    Hi, Duane,

    We have an input Over-voltage comparator inside the part (26V). Any input voltage higher than 26V, the charger will stop switching, however, the charger can survive 32V abs max voltage without damage. We don't suggest BQ25730 for 28V applications. 

    We have other parts with higher input rating, such as BQ25773/BQ25770G. It is good for 28Vin applications. 

    Regards,

    Tiger

  • 0 in reply to Tiger Zhou
    Prodigy 60 points

    Ok thanks, sounds like 26V is the hard limit then in terms of useful charging.  Cheers.