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Original question:

LM5141-Q1: Maximum output current capability

LM5141-Q1: LM5141-Q1: Maximum output current capability

Danny Liu
Prodigy 110 points

Part Number: LM5141-Q1

Hello team,

I'd like to use LM5141-Q1 to design a single BUCK with:

Vin: 4V~36V

Vout: 3.3V

Iout: 14A

I understand that the output current is determined by the power stage componnets (MOSFET and inductor), not the controller. (forum related question link:LM5141-Q1: Maximum output current capability - Power management forum - Power management - TI E2E support forums)

but it's strange that in below product webpage, Product details parameter shows the max output current for this device is 30A, while in the same page scroll down, the WEBENCH tool shows the max output current for this device is 10A only? 

Additionally, in another question answer, it's said that the max output current limit of this device is 10A?. (forum related question link: LM5141-Q1: Maximum output current capability - Power management forum - Power management - TI E2E support forums)

So, whether it's possible to design a BUCK of14A Iout_max with LM5141-Q1? If yes, would you please suggest a proper simulation tool for fast evaluation?

As a reference,

Product webpage: LM5141 data sheet, product information and support | TI.com

  • 0
    TI__Guru* 82567 points

    Hi Danny, 10A is entered for a typical design in WEBENCH. It doesn't represent the "max current", which as you mentioned is power-stage component related.

    I have seen designs at 25A and 30A...just depends as well on Fsw and max Tambient. I recommend using the quickstart calculator to check efficiency, power losses, etc. 14A shouldn't be a problem...

    Regards,

    Tim