Automotive Pre-Regulator (SEPIC 5Vout @ 3A) Reference Design
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Key Document


The PMP30331 reference design is for an input voltage from 5V to 16V.  Cranking is possible for voltages as low as 4V and load dump for voltages to 36V.  This reference design uses the SEPIC topology as a cost effective alternative for 4 switch buck-boost (for low power).

  • Power stage optimized for 13.8V nominal input
  • Small size
  • Better efficiency due to synchronous topology (about 5% compared to non-synchronous)
  • Highest reliability due to low thermal stress even at full load
  • The reference design is built and tested

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Schematic/Block Diagram

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Design Guide

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Design Files

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(Output Voltage 1)
Vin (Min) (V)5
Vin (Max) (V)16
Vout (Nom) (V)5
Iout (Max) (A)3
Output Power (W)15
Input TypeDC
TopologySepic- Synchronous

TI Devices (1)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
LM25122-Q1  Automotive Grade, 3-42V Wide Vin, Synchronous Boost Controller with Multiphase Capability  Step-up (boost)  Sample & Buy Not Available

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
LM25122-Q1 Download

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Technical Documents

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User guides (1)
Title Type Size (KB) Date
PDF 1800 17 Nov 2017
Design files (6)
Title Type Size (KB) Date
ZIP 33 17 Nov 2017
ZIP 490 17 Nov 2017
PDF 563 17 Nov 2017
PDF 96 17 Nov 2017
PDF 79 17 Nov 2017
PDF 101 17 Nov 2017

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