Wide input synchronous buck converter reference design with frequency spread spectrum


Design files


This reference design is a synchronous buck converter for automotive applications utilizing a synchronous buck controller with frequency spread spectrum. The design uses a dual MOSFET in power SO-8 package. Forced pulse width modulation (FPWM) or diode emulation mode (DEMB) is jumper selectable. The features include an enable input and power good flag. The switching frequency is set to 440 kHz. Frequency dithering and input filtering help improve EMI performance. Modified frequency compensation supports all ceramic output capacitors.

  • All ceramic output capacitors for increased reliability
  • Peak current-mode control simplifies compensation design
  • On-board EMI filter eases compliance testing
  • Frequency dithering improves EMI performance
  • Dual MOSFET improves switching performance
Output voltage options PMP21107.1
Vin (Min) (V) 5.5
Vin (Max) (V) 42
Vout (Nom) (V) 3.3
Iout (Max) (A) 5
Output Power (W) 16.5
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.

TIDT075.PDF (3087 K)

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


Detailed schematic diagram for design layout and components


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


Detailed overview of design layout for component placement


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

TIDCF84.ZIP (371 K)

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


PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

Buck controllers (external switch)

LM25141-Q1Automotive 2.2-MHz, low-IQ synchronous buck controller with frequency spread spectrum

Data sheet: PDF | HTML

Technical documentation

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Type Title Date
* Test report Wide input synchronous buck converter reference design Jan. 15, 2019

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