Automotive wide VIN front-end reference design for digital cockpit processing units


Design files


This reference design shows a complete power tree for automotive digital cockpit applications. The LM74700-Q1 provides low-loss reverse polarity protection to the system, followed by an input filter. The LM5143-Q1 dual-synchronous buck converter provides a 3.3-V rail, which can support up to 15 A for a processor module, and a 5-V rail with 3-A from KL30. The TPS62810-Q1 synchronous buck converter provides a 1.1 V/3-A rail from the 5-V output. Another independent 3.3-V rail with 3 A from KL30 is provided by the LM63635-Q1 synchronous buck converter.

  • Uses low-loss smart diode controller for input reverse polarity protection
  • Includes an input filter to minimize the reflected ripple of the buck converters
  • High efficiency across all rails for low power dissipation in space constrained applications
  • Very good load transient performance on the 3.3-V/15-A rail with onboard load
  • Small system standby power because of low-Iq capability of LM5143-Q1 and LM63635-Q1
Output voltage options PMP30670.1 PMP30670.2 PMP30670.3 PMP30670.4
Vin (Min) (V) 6 6 6 4.5
Vin (Max) (V) 36 36 36 5.5
Vout (Nom) (V) 5 3.3 3.3 1.1
Iout (Max) (A) 3 15 3 3
Output Power (W) 15 49.5 9.9 3.3
Isolated/Non-Isolated Non-Isolated Non-Isolated Non-Isolated Non-Isolated
Input Type DC DC DC DC
Topology Buck- Synchronous Buck- Synchronous Buck- Synchronous Buck- Synchronous

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.

TIDT122.PDF (4415 K)

Test results for the reference design, including efficiency graphs, test prerequisites and more

TIDM092.PDF (358 K)

Detailed schematic diagram for design layout and components

TIDM093.PDF (105 K)

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

TIDM094.PDF (309 K)

Detailed overview of design layout for component placement

TIDM096.ZIP (1797 K)

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


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

TIDM095.PDF (1314 K)

PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

Buck controllers (external switch)

LM5143-Q13.5-V to 65-V low Iq, dual, 2-phase synchronous buck DC-DC controller

Data sheet document-pdfAcrobat PDF open-in-new HTML
Buck converters (integrated switch)

LM63635-Q13.5-V to 32-V, 3.25-A step-down voltage converter with spread spectrum

Data sheet document-pdfAcrobat PDF open-in-new HTML
Buck converters (integrated switch)

TPS62810-Q1Automotive 2.75-V to 6-V, 4-A step-down converter in a 2mm x 3mm wettable-flanks QFN package

Data sheet document-pdfAcrobat PDF open-in-new HTML
Buck converters (integrated switch)

TPS62810M2.75-V to 6-V, 4-A step-down converter in a 2-mm x 3-mm QFN package with -55C extended temperature

Data sheet document-pdfAcrobat PDF open-in-new HTML
Ideal diode/ORing controllers

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

Data sheet document-pdfAcrobat PDF open-in-new HTML

Technical documentation

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Type Title Date
* Test report Automotive Wide VIN Front-End Ref Design for Digital Cockpit Processing Units Jul. 30, 2019

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