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LM25149: Design of a 3.5V 40A Power supply

Nicolas Fournier
Prodigy 10 points
Part Number: LM25149
Other Parts Discussed in Thread: LM25148

Hi, I'm designing a power supply system for a High brigtness Led display.

My requirements are 3.5V 40A wich i though would fit a LM25149 in dual phase arangement,

But in the datasheet, the examples scare me a bit, always showing a 20A output, even for a dual phase design (the component is supposed to be able to handle 30A on its own already)

Do you have any part suggestions for such a design ?

Detailed requirements:
-> passive cooling (radiator ok)
-> atleast 30A sustained load and handle 40A for a few seconds

-> input voltage : from 12 to 20-25V

-> Active EMI filtering is a plus but not a requirement

Thank you,
Nalco

  • 0
    TI__Mastermind 22301 points

    Hi Nalco,

    Yes I think LM25149 or LM25148 would be acceptable in this application.

    The datasheet is showing an example with no cooling, that is why the currents are usually limited to 10A per phase.

    Above 10A, the MOSFETs and inductor will get very hot and the thermals will be a significant concern.

    30A should be feasible with dual-phase for 15A per phase, especially if heatsink is available. If 40A is a transient that should be OK.

    You can use the quickstart calculators for single phase to do a 15A design, and then combine that in a dual-phase.

    Let me know if you have further questions,

    -Orlando