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TPS2045A: Current limit vs. Current budget of power switch

Tom Nguyen1
Prodigy 60 points
Part Number: TPS2045A
Other Parts Discussed in Thread: TPS2552

Hi TI,

I plan to use TPS2045A for my design - an USB hub. The IC specification: 0.25A continuous current and 0.5A limit current.

The application budget is only 0.3A. Therefore, if a load consumes more than 0.3A, I want the power switch to detect and notify the host MCU.

What will happen if the load at USB port consumes 0.4A?

Thanks,

Tom

  • 0
    TI__Expert 8420 points

    Hi,

    We  don't suggest use  the continuous  current more the SPEC .

    The higher current  will let the device go into thermal protection or the lifetime will not  guarantee. 

    If you  want to use  0.4A we suggest you choose the  suitable device  for your design ,thanks!

  • 0 in reply to Michael Tan
    Prodigy 60 points

    Hi Michael,

    Budget is 0.3A, I plan to use 0.25A continuous current as threshold.

    In this case, I am picturing how the device will respond when 0.4A load attached.

    As you mentioned, 0.4A continuous current will let TPS2045A go into thermal protection or the lifetime will not guarantee.

    Regarding thermal protection, with 0.4A, I estimate thermal about 27oC.

    Regarding lifetime, I think TPS2045A can be tolerant 0.4A.

    One more thing, TPS2045A has Recommended Maximum Continuous Current. But other power switches don’t mention Continuous Current during calculating threshold. For example, TPS2552’s datasheet

    Thanks,

    Tom

  • 0 in reply to Tom Nguyen1
    TI__Mastermind 18031 points

    Hi Tom,

    Sorry for missing the thread.

    0.4A load is sure to influence the lifetime of IC as with 0.25A continuous current.

    You can set the current limit above continuous current. But that's is in fault condition.

    For TI's policy, I will first click resolved button.

    If you have any other concern, contact me any time.

    If you think resolved, please help click 'Issue is solved button'.

    Thanks.