Automotive Off-battery VCM Supporting 2.5-V Cold Crank Profile Reference Design


Design files


This reference design is a high-current, wide input voltage range circuit that can handle engine cold crank profile down to 2.5V. The dual-output voltages are 5V and 3.3V that support up to 10A for each output. The design is suitable for an automotive off-battery infotainment application that needs to support a very stringent starting profile down to 2.5V.

  • Wide input voltage range of 2.5V to 40V
  • Dual high-current synchronous outputs: 5V, up to 10A; 3.3V, up to 10A
  • Continuous operation during engine crank transient down to 2.5V
  • 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.


Reference design overview and verified performance test data


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

TIDRVJ6.ZIP (1354 K)

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

TIDCEH4.ZIP (1631 K)

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

TIDRVJ5.PDF (1402 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
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 VCM, Supporting 2.5-V Cold Crank Profile Reference Design Jan. 30, 2018

Related design resources

Hardware development

AUTOCRANKSIM-EVM Simulator for automotive cranking pulses evaluation module

Reference designs

PMP7233 Cranking Simulator Reference Design for Automotive Applications

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