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LM25143-Q1: LM25143-Q1 Maximum Channel current of Dual phase with two different voltages(Vout1-5V)(Vout2-3V3)

Harish Muthuvel
Prodigy 40 points
Part Number: LM25143-Q1

Hello Texas Instruments,

Good Day!!!!!!!!!

In the datasheet we can't able to find the maximum channel current of LM25143-Q1. Just wanted to know what can be the maximum current of both channels(VOUT1 & VOUT2)

Thanks for understanding

  • 0
    TI__Mastermind 29520 points

    Hello Harish,

    Typically, around 15 to 25A per phase depending on the output power.  You will be limited by power dissipation per phase where you will have to manage the thermals.  Then at some point when you increase the current, the sense resistor becomes so small you become suspectable to noise.  Typically, you will be gated by the thermals rather than a small sense resistor.  Again, the currents per phase is just a rough guide, bench results will govern.

    hope this helps.

    David.

  • 0 in reply to David Baba
    Prodigy 40 points

    Hello David,

    Thank you for the response. We have one requirement of 3.3V/22A in one channel and 5V/8A in second channel. Is it possible to configure. Any challenges can be expected.

  • +1 in reply to Harish Muthuvel
    TI__Mastermind 29520 points

    Hello Harish,

    The 22A high, will need to estimate the losses.  please use the design calculator spreadsheet and enter in the parameter for your requirements populating the MOSFET section.  The MOSFETs will be the hottest devices.  There in the calculator will be provided temp rise when you populate the thermal resistance of the MOSFETs used.

    In short, your requirements are not impossible, would be easier to achieve with a single output dual phase for the 22A, and I would go this route, if I wanted to take the easier path to a workable solution.

    LM5143DESIGN-CALC Calculation tool | TI.com

    Hope this helps.

    David.