EMI Optimized 2-layer 15W Power Supply for Automotive with CISPR 25 Class 5 Compliance


Design files


The PMP10604 reference design is a 2-layer board 5V, 3A output power supply using LM53603 buck regulator for cluster unit in automotive applications. The LM53603 is a 3.5V to 36V input, 3A output capable, and 2.1 MHz fixed frequency buck regulator, specially designed for automotive applications. It has exceptionally low quiescent current (24µA typical at no load), and can transit to PFM from PWM to ensure high efficiency at light load. For this reference design, it has an input voltage range of 7.5V to 36V, covering the wide variation conditions of the 12V battery in automotive space. The reference board includes an input EMI filter section, and the layout is optimized for improved EMI performance on a 2-layers PCB. The board was tested under the automotive EMC standard, CISPR 25, and the conducted emissions were in compliance with the CISPR 25 Class 5 requirements.

  • 7.5V to 36V input voltage range
  • 91% peak efficiency
  • EMI optimized 2-layout design, compliance with CISPR 25 Class 5 conducted emissions standard
  • 2.1MHz fixed frequency, and seamless transition to PFM mode at light load
  • Sub 75µA operating quiescent current
  • The reference board is tested, and the test report and design files are included
Output voltage options PMP10604.1
Vin (Min) (V) 7.5
Vin (Max) (V) 36
Vout (Nom) (V) 5
Iout (Max) (A) 3
Output Power (W) 15
Isolated/Non-Isolated Non-Isolated
Input Type DC
Topology 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.

TIDUA29.PDF (594 K)

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

TIDRF43.PDF (123 K)

Detailed schematic diagram for design layout and components

TIDRF44.PDF (100 K)

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


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

TIDRF45.PDF (394 K)

PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

AC/DC & DC/DC converters (integrated FET)

LM53603-Q1Automotive 3.5-V to 36-V, 3-A synchronous step-down converter

Data sheet: PDF | HTML

Technical documentation

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Type Title Date
* Test report PMP10604 Test Results Jun. 10, 2015
Technical article Overcoming automotive cluster power supply design challenges PDF | HTML Nov. 13, 2015

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