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LM5175: How to choose LM5175 buck-boost MOSFET at Vds
Thank you for posting. I would strongly recommend LM5176 instead of LM5175.
To choose the MOSFETs, you need to calculate the power dissipations. Plug in the MOSFET parameters into the design calculator (link given below), you can get the conduction and switching losses. The key consideration is to minimize the overall losses.
For voltage rating, the buck leg FETs should be rated higher than the max input voltage, and the boost leg FETs rated higher than the output voltage. A good practice is to choose the FETs having at least 10%~20% voltage margin.
