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TPS7A57: Thermal design

Saied Benyamin
Prodigy 130 points
Part Number: TPS7A57

I have an EMI application where I need to use a linear regulator to generate 0.85V from a 5V input.  This load is 2A continuous but may go to 3.5A for 500ms at initialization.  So for heat dissipation, I need to consider 2A@4.2V or so.  Can you confirm if this device can dissipate this kind of heat?  The junction to case theta seems to be best for the bottom, so a heat sink on top will not help.  Do you have recommendation for how to dissipate this much heat?

Thank you

  • +1
    TI__Expert 6825 points

    Hi Saied,

    I don't think that this will work for you. Using the EVM layout you will have a Junction to ambient thermal resistance of ~20C/W so you will end up with ~160C of rise from heat dissipation. So this would not work at room temperature.

    There are a couple of options though, you could parallel LDOs and split the current, you can put them in series and drop less power across each one, or you can put a buck in front but I am guessing you are trying to avoid that due to EMI.

    Regards,

    Mark