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


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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Schematic/Block Diagram

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Design Guide

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Design Files

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TI Devices (3)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
LM25122-Q1  3-42-V wide VIN, synchronous boost controller with multiphase capability, AEC-Q100 qualified  Step-up (boost) regulators  Sample & Buy Not Available
LM5140-Q1  Wide Vin Dual 2.2MHz low Iq Synchronous Buck Controller  Step-down (buck) regulators  Sample & Buy View Design Kits & Evaluation Modules
LM74700-Q1  3.2-V to 65-V, 80-uA IQ automotive ideal diode controller  Power switches  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
LM25122-Q1 Download
LM5140-Q1 Download Download
LM74700-Q1 Download -

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Technical documentation

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User guide (1)
Title Type Size (KB) Date
PDF 949 30 Jan 2018
Design files (6)
Title Type Size (KB) Date
ZIP 1631 30 Jan 2018
ZIP 1354 30 Jan 2018
PDF 1402 30 Jan 2018
PDF 257 30 Jan 2018
PDF 62 30 Jan 2018
PDF 323 30 Jan 2018
Related Tools & Software

Reference Designs (1)

Name Part Number Tool Type
Cranking Simulator Reference Design for Automotive Applications  PMP7233  Reference design 

Hardware development (1)

Name Part Number Tool Type
Simulator for automotive cranking pulses evaluation module  AUTOCRANKSIM-EVM  Evaluation board 

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