12V@5A Synchronous SEPIC Converter Reference Design


Design files


This reference design operates from a 6V to 16V input and supplies 12V @ 5A out. It utilizes the LM5122 synchronous boost controller to operate as a synchronous SEPIC converter.  The circuit achieves greater than 95% efficiency at maximum load.

  • Synchronous SEPIC operation
  • >95% efficiency
  • Coupled-inductor capability
Output voltage options PMP10886.1
Vin (Min) (V) 16
Vin (Max) (V) 600
Vout (Nom) (V) 12
Iout (Max) (A) 5
Output Power (W) 60
Isolated/Non-Isolated Non-Isolated
Input Type DC
Topology Sepic- 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.

TIDU769.PDF (2957 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

TIDC897.ZIP (334 K)

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


Includes TI products in the design and potential alternatives.

Boost controllers (external switch)

LM51223-65V Wide Vin, Current Mode Synchronous Boost Controller with Multiphase Capability

Data sheet: PDF | HTML
N-channel MOSFETs

CSD18504Q5A40-V, N channel NexFET™ power MOSFET, single SON 5 mm x 6 mm, 6.6 mOhm

Data sheet: PDF | HTML

Technical documentation

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Type Title Date
Technical article Power Tips: Synchronize your SEPIC PDF | HTML Apr. 29, 2015
Test report PMP10886 Test Results Feb. 06, 2015

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