CISPR 25 Class 5 Rated 3.3W Automotive Power Reference Design


Design files


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.

  • CISPR 25 class 5 conducted emissions standard compliance
  • LM26001, 38V, 1A, buck regulator
  • 4.5-38V operating input voltage range
  • Input EMI filter to suppress conducted emissions
  • Optimized layout for better EMI performance
  • 3.3W power supply design, ideal for 12V automotive battery system
Output voltage options PMP9397.1
Vin (Min) (V) 4.5
Vin (Max) (V) 38
Vout (Nom) (V) 3.3
Iout (Max) (A) 1
Output Power (W) 3.3
Isolated/Non-Isolated Non-Isolated
Input Type DC
Topology Buck- Non Sync

A fully assembled board has been developed for testing and performance validation only, and is not available for sale.

Design files & products

Design files

Download ready-to-use system files to speed your design process.

TIDU659.PDF (270 K)

Test results for the reference design, including efficiency graphs, test prerequisites and more


Detailed schematic diagram for design layout and components


Complete listing of design components, reference designators, and manufacturers/part numbers

TIDC779.ZIP (65 K)

Design file that contains information on physical board layer of design PCB


Includes TI products in the design and potential alternatives.

Buck converters (integrated switch)

LM260011.5A Switching Regulator with High Efficiency Sleep Mode

Data sheet document-pdfAcrobat PDF open-in-new HTML

Technical documentation

No results found. Please clear your search and try again.
View all 2
Type Title Date
Technical article System Integration using optimized EMC designs Dec. 19, 2014
Test report PMP9397 Test Results Nov. 24, 2014

Support & training

TI E2E™ forums with technical support from TI engineers

View all forum topics

Content is provided "as is" by TI and community contributors and does not constitute TI specifications. See terms of use.

If you have questions about quality, packaging or ordering TI products, see TI support. ​​​​​​​​