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

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Schematic/Block Diagram

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Test Data

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Design Files

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(Output Voltage 1)
Vin (Min) (V)6.5
Vin (Max) (V)38
Vout (Nom) (V)5
Iout (Max) (A)2
Output Power (W)10
Input TypeDC
TopologyBuck- Non Sync
Buck- Synchronous

TI Devices (2)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
LM26003  3A Switching Regulator with High Efficiency Sleep Mode  Step-down (buck) regulators  Sample & Buy View Design Kits & Evaluation Modules
LM26420  Dual 2 A, high-efficiency synchronous DC/DC converter  Step-down (buck) regulators  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
LM26003 Download Download
LM26420 Download Download
Download Download

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Technical documentation

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User guides (1)
Title Type Size (KB) Date
PDF 1016 20 Aug 2014
Design files (4)
Title Type Size (KB) Date
ZIP 208 20 Aug 2014
PDF 874 20 Aug 2014
PDF 370 20 Aug 2014
PDF 247 20 Aug 2014

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