Automotive Input SEPIC Power Supply Reference Design with Two Isolated Rails


Design files


The PMP20550 is a simple design using a SEPIC to produce 3 power rails in which 2 of those are isolated from the input supply. This design is made entirely with automotive qualified IC's and magnetics. The PMP20550 reference design has been designed with optional components to allow the user to adjust output voltage precision as desired.

  • 7 to 16 VDC Input, 5V output at 0.5A, isolated 5V output at 0.2A, isolated 12V output at 0.1A
  • Isolated outputs
  • Utilizes all automotive qualified ICs and magnetics
  • Test report available
Output voltage options PMP20550.1 PMP20550.2 PMP20550.3
Vin (Min) (V) 7 7 7
Vin (Max) (V) 16 16 16
Vout (Nom) (V) 5 12 5
Iout (Max) (A) .2 .1 .2
Output Power (W) 1 1.2 1
Isolated/Non-Isolated Non-Isolated Isolated Isolated
Input Type DC DC DC
Topology Sepic- Integrated Switch Sepic- Integrated Switch Sepic- Integrated Switch
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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.


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

TIDRPQ6.ZIP (40709 K)

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

TIDCD54.ZIP (1303 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.

Boost converters (integrated switch)

TPS55340-Q1Integrated, 5-A 40-V wide input range boost/SEPIC/flyback DC/DC regulator, AEC-Q100 qualified

Data sheet: PDF | HTML
Linear & low-dropout (LDO) regulators

TPS799-Q1Automotive 200-mA, low-IQ, low-dropout voltage regulator with enable

Data sheet: PDF | HTML

Technical documentation

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Type Title Date
* Test report PMP20550 Test Results (Rev. A) Jun. 15, 2017

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