PMP9397, CISPR 25 Class 5 Rated 3.3W Automotive Power Reference Design. The PMP9397 reference design provides a conducted EMI optimized 3.3W power supply design for automotive applications. The design uses the non-synchronous buck regulator, LM26001, to generate a 3.3V, 1A output. The input voltage range is 4.5V to 38V suitable for automotive battery supply. The reference design comes with the input EMI filter stage to suppress the switching noise in the input supply line and the board is tested to be compliant with the CISPR 25 Class 5 conducted emissions standard