Automotive Power Reference Design for Infotainment Systems
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This reference design shows a complete power tree for automotive infotainment systems. The LM74700-Q1 provides reverse battery protection to the system and provides immunity to automotive transients specified in ISO 7637-2 and ISO 16750-2. The pre-booster with LM5150-Q1 provides a stable supply voltage of 10.5V during cranking for the dual-synchronous buck converter with LM5140-Q1, that provides an output voltage of 3.3V for a load current of 6.0A and an output voltage of 7.5V for a load current of 2.5A.

  • Automotive power system reference design
  • Supports input voltage down to 3.2V
  • Reverse polarity protection
  • Automotive transient immunity to ISO 7637-2 and ISO 16750-2 tests
  • Small form factor

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Schematic/Block Diagram

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Design Files

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(Output Voltage 1)
(Output Voltage 2)
(Output Voltage 3)
Vin (Min) (V)3.210.510.5
Vin (Max) (V)404040
Vout (Nom) (V)
Iout (Max) (A)1.562.5
Output Power (W)15.7519.818.75
Input TypeDCDCDC
TopologyBoost- Non SyncBuck- SynchronousBuck- Synchronous

TI Devices (3)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
LM5140-Q1  Wide Vin Dual 2.2MHz low Iq Synchronous Buck Controller  Step-down (buck) regulators  Sample & Buy View Design Kits & Evaluation Modules
LM5150-Q1  1.5-V to 42-V wide VIN, low IQ boost controller with 4 programmable output voltage options  Step-up (boost) regulators  Not Available 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)
LM5140-Q1 Download Download
LM5150-Q1 Download
LM74700-Q1 Download -

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Technical documentation

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User guide (1)
Title Type Size (KB) Date
PDF 1923 01 Oct 2019
Design files (6)
Title Type Size (KB) Date
ZIP 62 16 Apr 2018
ZIP 1435 16 Apr 2018
PDF 375 16 Apr 2018
PDF 288 16 Apr 2018
PDF 29 16 Apr 2018
PDF 296 16 Apr 2018

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