Automotive EMI and thermally optimized synchronous buck converter reference design
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This reference design is an EMI and thermally optimized synchronous buck converter for automotive applications. The circuit is powered from the nominal 12-V battery to provide an output voltage of 3.3 V at 8 A. The design uses a synchronous buck controller operating at a switching frequency of 440 kHz. Forced pulse width modulation or diode emulation mode is jumper selectable. Frequency dithering is used to improve the EMI performance.

  • EMI and thermally optimized for improved system performance
  • 440 kHz switching frequency, which is below the AM band
  • Jumper selectable diode emulation or forced PWM
  • Selectable frequency dithering improves EMI performance
  • Compact power stage and controller layout for small solution size

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(Output Voltage 1)
Vin (Min) (V)4.5
Vin (Max) (V)20
Vout (Nom) (V)3.3
Iout (Max) (A)8
Output Power (W)26.4
Input TypeDC
TopologyBuck- Synchronous

TI Devices (1)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
LM5141-Q1  Wide-Input 2.2MHz Low-Iq Synchronous Buck Controller  Step-down (buck) regulators  Sample & Buy View Design Kits & Evaluation Modules

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Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
LM5141-Q1 Download Download

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User guides (1)
Title Type Size (KB) Date
PDF 2001 21 Dec 2018
Design files (6)
Title Type Size (KB) Date
ZIP 525 21 Dec 2018
ZIP 1031 21 Dec 2018
PDF 1083 21 Dec 2018
PDF 134 21 Dec 2018
PDF 101 21 Dec 2018
PDF 199 21 Dec 2018

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