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LM5118-Q1: Advice for automotive radar application

Faiz Ahmed
Intellectual 460 points
Part Number: LM5118-Q1
Other Parts Discussed in Thread: LM5118, TIDA-01179

Hello,

I just wanted to get some general advice on designing power supply that meets the ISO16750-2,ISO7637, and CISPR25 standards. I was looking at TIDA-01179 reference design and wanted LM5118 to output 5V directly instead of 15V. Here is a block diagram

Do you guys see any issues with doing this? From playing around on the WEBBENCH, it seems to be fine, but I just wanted to clarify.

Also, is there a better solution than this? It seems that using a buck-boost converter would take up less real estate than the pre-boost then buck converter. This would be for AWR radar chips.

Thank you,

Faiz

  • 0
    TI__Guru 68535 points
    I agree with you in using the LM5118 in this design. I am not sure if the front end TVS diode is needed. Check if there is a system level TVS to clamp the load dump voltage to below 42V. If yes, you may save the front end TVS.