2-MHz synchronous 5-V buck reference design
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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

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(Output Voltage 1)
Vin (Min) (V)6.5
Vin (Max) (V)32
Vout (Nom) (V)5
Iout (Max) (A)2.5
Output Power (W)12.5
Input TypeDC
TopologyBuck- Integrated Switch
Buck- Synchronous

TI Devices (1)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
LM63625-Q1  3.5-V to 36-V, 2.5-A step-down voltage converter with spread spectrum  Step-down (buck) regulators  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
LM63625-Q1 Download
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User guide (1)
Title Type Size (KB) Date
PDF 4907 12 Mar 2020
Design files (6)
Title Type Size (KB) Date
ZIP 42 12 Mar 2020
ZIP 386 12 Mar 2020
PDF 237 12 Mar 2020
PDF 92 12 Mar 2020
PDF 189 12 Mar 2020
PDF 118 12 Mar 2020

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