Automotive Off-battery Dual-phase Boost Converter Reference Design


Design files


This reference design is a high power, wide input voltage range circuit that uses synchronous boost controllers in a dual-phase configuration outputting four (4) switchable 12-V rails that each can supply up to 2.5 A with diagnostic features; plus a dual synchronous buck that generates two high current, lower voltage rails.

  • Wide input voltage range of 9V to 20V, support transient down to 6V and up to 36V
  • Dual-phase high current synchronous boost controllers configuration with > 98% efficiency under typical operating conditions
  • Dual high-current synchronous outputs: 5V, 3A nominal; 3.8V, 6.5A nominal
  • Reverse battery protection with zero IQ smart diode controller
  • Minimized AM radio band interference
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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.

TIDUDH2.PDF (9987 K)

Reference design overview and verified performance test data

TIDRV88.PDF (461 K)

Detailed schematic diagram for design layout and components

TIDRV89.PDF (65 K)

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

TIDRV90.PDF (421 K)

Detailed overview of design layout for component placement

TIDRV92.ZIP (1704 K)

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

TIDCEE6.ZIP (1748 K)

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

TIDRV91.PDF (2276 K)

PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

Boost controllers (external switch)

LM25122-Q13-42-V wide VIN, synchronous boost controller with multiphase capability, AEC-Q100 qualified

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

LM5140-Q1Wide Vin Dual 2.2MHz low Iq Synchronous Buck Controller

Data sheet: PDF | HTML
High-side switches

TPS1H100-Q140-V, 100-mΩ, 1-ch automotive smart high-side switch with adjustable current limit

Data sheet: PDF | HTML
Ideal diode/ORing controllers

LM74700-Q13.2-V to 65-V, 80-uA IQ automotive ideal diode controller

Data sheet: PDF | HTML

Technical documentation

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Type Title Date
* Design guide Automotive Off-Battery Dual-Phase Boost Converter Reference Design Nov. 09, 2017

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