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


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

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Design Files

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(Output Voltage 1)
(Output Voltage 2)
(Output Voltage 3)
(Output Voltage 4)
Vin (Min) (V)6664.5
Vin (Max) (V)3636365.5
Vout (Nom) (V)
Iout (Max) (A)31533
Output Power (W)1549.59.93.3
TopologyBuck- SynchronousBuck- SynchronousBuck- SynchronousBuck- Synchronous

TI Devices (4)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
LM5143-Q1  3.5-V to 65-V low Iq, dual, 2-phase synchronous buck DC-DC controller  Step-down (buck) regulators  Not Available View Design Kits & Evaluation Modules
LM63635-Q1  3.5-V to 32-V, 3.25-A step-down voltage converter with spread spectrum  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
TPS62810-Q1  Automotive 2.75-V to 6-V, 4-A step-down converter in a 2mm x 3mm wettable-flanks QFN package  Step-down (buck) regulators  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
LM5143-Q1 Download Download
LM63635-Q1 Download
LM74700-Q1 Download -
TPS62810-Q1 VQFN-HR (RWY)| 9 Download Download

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Technical documentation

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User guide (1)
Title Type Size (KB) Date
PDF 4344 30 Jul 2019
Design files (6)
Title Type Size (KB) Date
ZIP 327 30 Jul 2019
ZIP 1797 30 Jul 2019
PDF 1314 30 Jul 2019
PDF 309 30 Jul 2019
PDF 105 30 Jul 2019
PDF 358 30 Jul 2019

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