2-MHz synchronous 5-V buck reference design


Design files


This reference design uses a tiny automotive buck converter to support a 5-V rail by input voltage range 6.5-V up to 32-Vpk surge. The layout and design are optimized to pass CISPR-25. The design is equipped with a two-stage input filter to minimize conducted emissions and a solid ground plane to attenuate radiated emissions in short wave range. Power stage capacitors are routed back-to-back to minimize parasitic inductances at forward and freewheeling loop. Highlights of this design are a cost-effective two-layered board (typical for automotive cluster and display applications), single-side assembly and keeping the solid ground plane to pass EMI.

  • Cost-efficient low power automotive 5 V supply delivers up to 15-W output power
  • Two-stage input filter reduces conducted emissions due to reflected ripple
  • Small passives due to high switching frequency and integrated FETs allow small form factor
  • Two-layer board with single side assembly on top simplifies manufacturing
  • Solid ground plane on bottom side realizes better EMC performance
Output voltage options PMP30794.1
Vin (Min) (V) 6.5
Vin (Max) (V) 32
Vout (Nom) (V) 5
Iout (Max) (A) 2.5
Output Power (W) 12.5
Isolated/Non-Isolated Non-Isolated
Input Type DC
Topology Buck- Integrated Switch^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.

TIDT166.PDF (4941 K)

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

TIDM502.PDF (118 K)

Detailed schematic diagram for design layout and components

TIDM503.PDF (189 K)

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

TIDM504.PDF (92 K)

Detailed overview of design layout for component placement

TIDM506.ZIP (386 K)

Files used for 3D models or 2D drawings of IC components


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

TIDM505.PDF (237 K)

PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

Buck converters (integrated switch)

LM63625-Q13.5-V to 36-V, 2.5-A step-down voltage converter with spread spectrum

Data sheet: PDF | HTML

Technical documentation

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Type Title Date
* Test report 2-MHz Synchronous 5-V Buck Reference Design Mar. 12, 2020

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