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LMG5200: Max current

Dave-o
Prodigy 110 points
Part Number: LMG5200

Hi,

from my reading, so far, of the data sheet, the maximum current  is 10A. Is that an average or a peak value? In MOSFET's the average is normally less than the peak value. I think i am pushing 18A for 1uS and (average 4mA) nothing has popped yet,  I would like 25A for brief repetitive peaks, I have not found the typical MOSFET style safe operating area graph.

Thanks

Dave

  • 0
    TI__Expert 3225 points
    Hello Dave,

    The 10A current rating is for average current. If you happen to have some short pulse current at 25A, I don't think it has any risk.

    Thanks and regards,
    Lixing
  • 0 in reply to Lixing Fu
    Prodigy 110 points

    Thanks.

    I'll see how I get on...

  • 0 in reply to Dave-o
    Prodigy 110 points

    I have re read the data sheet, it does state that 10A is the absolute maximum current from the SW pin. You may want to clarify that on the data sheet.  Also I don't see any package dissipation in simple to understand numbers. In my tests on the EVM board, to achieve  what I want, I am dissipating 20 Watts on the board. I suspect about half of that is in the (different from supplied) inductor. I don't think this is a sustainable amount of power for the device... 

  • 0 in reply to Dave-o
    TI__Expert 3225 points
    Hello Dave,

    Yes in the datasheet it says 10A, but this is just an average value. Transient capability is more towards the device's SOA capability, but not for the package. Regarding the heat that can be dissipated, we did not specify this because different design in applications can stand different losses. You can calculate the thermal performance using the thermal resistance value that we provide, and it also depends on the thermal resistance of your board, and heat sink. In transient time, there would be more thermal capacitance, and it for sure can take higher wattage for short period.

    Thanks and regards,
    Lixing