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LMG2100R044: 300W Buck Solution

Joyce Gao
Expert 3150 points
Part Number: LMG2100R044
Other Parts Discussed in Thread: LM5148,

Hi expert,

We are evaluating a 300W Buck converter design for 500kHz.

Input: 48V

Output: 12V, 25A

Fsw: 500kHz

Could LMG2100 fit this power level? We are thinking use LM5148+LMG2100. Seems the power loss across GaN will be 2x25x25x4.4m=5.5W. Do we have such use case test? Thanks!

Joyce

  • 0
    TI__Expert 7695 points

    Hi Joyce,

    I have done the power loss calculations for this case and come up with roughly the same number. I calculate 5.7W of loss total from the LMG2100R044. The LMG2100R044 should be able to handle this power level given the customer has a thermal solution capable of handling 5.7W of loss (this should be feasible). 

    The LMG2100R044 has very low thermal resistance when using top side cooling, 0.7C/W. So that will help make the customer's thermal solution easier too.

    Best,

    Kyle

  • 0 in reply to Kyle Wolf
    TI__Expert 3150 points

    Hi Kyle,

    I saw in datasheet we have 12V/8A design, do you have any other higher load test with top side cooling? Is it possible to do a rough test for 25A level with that design? Customer concerns the performance and is not willing to do PCB without any test. 

    Thanks!

    Joyce

  • +1 in reply to Joyce Gao
    TI__Expert 7695 points

    Hi Joyce,

    We have evaluation module for the LMG2100R044. It is possible to test this configuration using the evaluation module.

    Best,
    Kyle Wolf