700-W, four-phase buck converter reference design with extended input voltage range


Design files


This reference design is a 700-W buck converter using the LM5143A-Q1 device. Due to low dead times, strong drivers and the ability to adjust the rising and falling edges individually, the resulting efficiency is 98%. Board area is minimized because of reduced loss. It is 150 mm × 125 mm with a low profile of 12 mm or 15 mm, depending on the inductor selected. Ample headroom for increased output power is available by using forced cooling or a heat sink mounted to a chassis. Using additional cooling options, the output current can be increased to 60-A continuous and higher. The interleaved operation results in low root mean square (RMS) stress at the input capacitor and reduced ripple at the input and the output. A generic two stage EMI input filter is provided.

  • Power supply delivers up to 700-W continuous and up to 1-kW peak output power.
  • The interleaved four-phase buck topology provides ripple rejection.
  • The extended input range (compared to PMP31202) makes the design an excellent choice for truck applications.
  • This reference design was built and tested in a lab.
Output voltage options PMP31210.1
Vin (Min) (V) 18
Vin (Max) (V) 58
Vout (Nom) (V) 13.8
Iout (Max) (A) 50
Output Power (W) 690
Isolated/Non-Isolated Non-Isolated
Input Type DC
Topology Buck- Multiphase^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.

TIDT319.PDF (1659 K)

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

TIDMB83.PDF (383 K)

Detailed schematic diagram for design layout and components

TIDMB84.PDF (240 K)

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

SNVC229F.ZIP (2035 K)

Tool for calculating critical component values required in the reference design

TIDMB85.PDF (336 K)

Detailed overview of design layout for component placement

TIDMB86.ZIP (1391 K)

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


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

TIDMB71.PDF (1921 K)

PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

Buck controllers (external switch)

LM51433.5-V to 65-V, dual-output, stackable, synchronous buck DC/DC controller with ultra-low IQ

Data sheet: PDF | HTML
Buck controllers (external switch)

LM5143-Q13.5-V to 65-V low Iq, dual, 2-phase synchronous buck DC-DC controller

Data sheet: PDF | HTML
Buck controllers (external switch)

LM5143A-Q1Automotive, 3.5-V to 65-V low-IQ, dual output, stackable synchronous buck DC-DC controller

Data sheet: PDF | HTML

Technical documentation

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Type Title Date
Test report 4-Phase Buck 700-W Reference Design (Extended Input Voltage Range) PDF | HTML Dec. 17, 2022

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