Automotive High Efficiency Power Front End and Multi-Phase Processor Supply Reference Design
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Key Document


This processor supply reference design is an automotive power solution for use in highperformance, single-core-voltage application processors in advanced driver assistance systems (ADASs). This design can support core supply currents up to 10 A at 0.9 V. The design can also operate with a wide input voltage range, withstand reverse battery conditions, and support start-stop and cold-crank down to a 3.5-V input with an undisturbed output. The sub-AM band switching frequency of the power front end improves efficiency and reduces board temperatures when compared to a power front end with faster switching frequency. The multiphase configuration and integration of supplies enables lower electromagnetic interference (EMI) and higher efficiency. This reference design also provides results for conducted emissions tests for CISPR 25 Class 5.

  • 5A integrated, 400kHz synchronous wide input voltage buck DC/DC converter with spread spectrum
  • Supplying 10A at 0.9V to core-voltage rail of application processor
  • Operating range 3.5 - 36V, supports start-stop and cold-crank
  • Interleaved four-phase core-voltage supply minimizing ripple, EMI and inductor size
  • Smart diode reverse battery protection for minimum voltage drop (typical 20mV)
  • Small switched cap boost for 5V CAN supply reduces solution size and BOM cost

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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 (5)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
LM26420-Q1  Dual 2 A, automotive-qualified, high-efficiency synchronous DC/DC converter  Step-down (buck) regulators  Sample & Buy View Design Kits & Evaluation Modules
LM2775  Switched Capacitor 5V Boost Converter  DC/DC switching 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
LMS3655-Q1  3.5A /5.5A, 36V Synchronous, 400kHz, Step-Down Converter  Step-down (buck) regulators  Sample & Buy View Design Kits & Evaluation Modules
LP87561-Q1  Automotive multiphase 16-A buck converter with integrated switches  Power management  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
LM26420-Q1 Download Download
Download Download
LM2775 Download Download
LM74700-Q1 Download -
LMS3655-Q1 Download Download
LP87561-Q1 Download Download

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Technical documentation

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User guides (1)
Title Type Size (KB) Date
PDF 15219 12 Oct 2017
Design files (6)
Title Type Size (KB) Date
ZIP 541 08 Dec 2017
ZIP 1102 08 Dec 2017
PDF 566 08 Dec 2017
PDF 59 08 Dec 2017
PDF 58 08 Dec 2017
PDF 322 08 Dec 2017
Related Tools & Software

Reference Designs (3)

Hardware development (1)

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

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