CISPR 25 Class 5 Rated 14W Multi-Output Power Supply for Automotive Cluster Unit Reference Design


Design files


The PMP9458 reference design is a conducted EMI optimized 2-layer board power supply for automotive cluster units. The power supply has two buck regulators in cascaded connection: the first stage buck generates a 5V, 2A output using the LM26003, and the second stage generates two outputs of 2.8V, 1.5A and 1.8V, 2A using the LM26420 (The max output power in total is 14W). The LM26003 is a wide Vin non-sync buck regulator, and the LM26420 is a 5V input dual 2A, high frequency sync buck regulator. They both have automotive grade versions, qualified in AEC-Q100 Grade 1. The input voltage range of the design is 6.5V to 38V making it suitable for automotive 12V battery systems. The 2-layer board design has the PCB layout optimized and adds an input filter stage to improve the conducted EMI performance. The board is tested under the automotive EMC standard, CISPR 25, and its conducted emissions are in compliance with the CISPR 25 Class 5 requirements.

  • Conducted EMI optimized 2-layer PCB design
  • In compliance with the CISPR 25 Class 5 conducted emissions standard
  • 6.5V to 38V wide Vin range
  • LM26003 and LM26420 both have AEC-Q100 qualified versions available
  • Power enable/shutdown configurable via the jumper pin
  • This circuit board is tested, and the design files and test report are included
Output voltage options PMP9458.1
Vin (Min) (V) 6.5
Vin (Max) (V) 38
Vout (Nom) (V) 5
Iout (Max) (A) 2
Output Power (W) 10
Isolated/Non-Isolated Non-Isolated
Input Type DC
Topology Buck- Non Sync^Buck- Synchronous
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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.

TIDU498.PDF (896 K)

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

TIDRA48.PDF (247 K)

Detailed schematic diagram for design layout and components

TIDRA49.PDF (370 K)

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

TIDC570.ZIP (208 K)

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

TIDRA50.PDF (874 K)

PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

Buck converters (integrated switch)

LM260033A Switching Regulator with High Efficiency Sleep Mode

Data sheet: PDF | HTML
Buck converters (integrated switch)

LM26420Dual 2 A, high-efficiency synchronous DC/DC converter

Data sheet: PDF | HTML

Technical documentation

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Type Title Date
Technical article Spread Spectrum: Headache tablet or vitamin pill? May 18, 2015
Test report PMP9458 Test Results Aug. 20, 2014

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