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LM25148-Q1: LM25148 for 25A output current

Nilesh Ranjan
Prodigy 190 points
Part Number: LM25148-Q1

Hello!

I would like to double check if this part can be used in applications where output specs is something like 5V, 25A. Is it necessary to use dual-phase mode in that case? If yes, why?

I assume since it's just a controller and we use FET's outside anyways, we should not be worrying about output current right?

Thanks!

  • +1
    TI__Mastermind 22299 points

    Nilesh,

    It is possible in single-phase, however it is not really practical.

    Because the I^2 * R losses grow parabolically with current, at higher currents every mΩ of resistance contributes more overall losses and the efficiency will eventually tank at high enough current.

    Also the heat increases significantly, and active cooling would be required.

    It is definitely recommended to do dual-phase.

    It can be designed single phase with proper FET and inductor selection, but that usually means larger inductor.

    Hope this helps,

    -Orlando

  • 0 in reply to Orlando Murray
    TI__Prodigy 190 points

    Thanks Orlando for insights.