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LM60430: About the efficiency of the LM60430A

Kaji@PAN
Mastermind 7260 points
Part Number: LM60430
Other Parts Discussed in Thread: LMS3655-Q1, , LMS3655

Hello,

I would like to ask you a question about the LM60430A.
When calculating the efficiency with WEBENCH, it is 97.55% as shown in the attached result.
For reference, the LMS3655-Q1 result is 95.87%.
This is because the IC Pd of the LM60430A is about half that of the LMS3655-Q1.
Is the LM60430A IC Pd a reliable result?
The LMS3655-Q1 has a BIAS pin and lower FET on-resistance.

Best regards,

LM60430_20to30Vin_9V1300mAout_15uH37mohm.pdf

LMS3655_20to30Vin_9V1300mAout_15uH37ohm.pdf

  • +1
    TI__Mastermind 27040 points

    HI 

    LM60430 best efficiency point in this condition is at 1A-1.3A , and LMS3655 will be 2A-2.5A.

    you can see LMS3655 efficiency still in raising but LM60430 is starting to decline. this means LMS3655 have larger switching loss compare to LM60430. and the Iq of LM60430 is smaller than LMS3655 when LMS3655 not connect Bias. 

    I think the result should be close to real one. But if you want to more accurate efficiency data, better to test with hardware. 

    Thanks