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TPS74801 shared outputs

Luke LaPointe
Genius 13335 points
Other Parts Discussed in Thread: TPS74801, TPS74901

If multiple TPS74801 are connected in parallel, can the outputs be shared?

  • 0
    TI__Guru**** 150900 points

    Since each IC has its own internal reference voltage that it is trying to regulate to, there is no guarantee of current sharing.

    This app note shows how to get them to current share: http://focus.ti.com/lit/an/slva250/slva250.pdf

  • 0 in reply to Chris Glaser
    TI__Expert 8890 points

     

    Hi Luke,

    And based on my reading of that article, it seems to me that current sharing is poor at best though usable in some circumstances.  The article recommends adding ballast resistors to each output.  As to your original question, without the ballast resistors, one of the two regulators will end up biasing off the other due to the slight part to part differences in reference voltage.

    Bill

  • 0
    TI__Guru 50190 points

    Hi Luke,

     

    If you simply need higher current, we have the TPS74901 which can support up to 3A. If you concern is thermal, are you just trying to spread the heat? Also, for these higher currents, I am curious to understand why you would prefer an LDO over a switcher.

     

    Thanks,

    John Cummings

    Strategic Marketing Manager

    High Power Linear