Automotive wide-VIN to point-of-load power supply with front-end circuit protection reference design
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Key Document


This automotive point-of-load power supply reference design features complete front-end protection in a small overall solution size. The system can clamp fast high-voltage electrical transients and maintain operation through these events. It can also properly respond to a reverse battery polarity event and shut down appropriately. This three-output design employs sequencing of two buck regulators to ensure proper power-on and power-down timing, and features an input pi filter to reduce conducted EMI. The design accepts an input voltage of 5 V to 36 V and provides outputs of 3.3 V, 1.2 V, and 1.8 V. This supply is capable of supplying 2 A on the 1.8 V and 1.2-V outputs, while the 3.3-V output simultaneously supplies 3.55 A.

  • Complete wide Vin front-end automotive power supply
  • Off-battery operation with reverse battery protection 
  • Positive and negative transient voltage protection
  • Auto-sequencing of all three power rails
  • Reduced EMI with included pi filter

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Design Files

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(Output Voltage 1)
(Output Voltage 2)
(Output Voltage 3)
Vin (Min) (V)555
Vin (Max) (V)363636
Vout (Nom) (V)
Iout (Max) (A)3.5522
Output Power (W)11.7152.43.6
Input TypeDCDCDC
TopologyBuck- Integrated SwitchBuck- Integrated SwitchBuck- Integrated Switch

TI Devices (3)

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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
LM73606  3.5V to 36V, 6A Synchronous Step-Down Voltage Converter  Step-down (buck) regulators  Sample & Buy View Design Kits & Evaluation Modules
LM74610-Q1  0.48-V to 42-V, zero 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)
LM26420-Q1 Download Download
Download Download
LM73606 Download
LM74610-Q1 Download Download

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Technical documentation

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Datasheet (3)
Title Type Size (KB) Date
PDF 1586 13 Apr 2018
PDF 2215 21 Jul 2017
PDF 1314 07 Jun 2016
User guide (1)
Title Type Size (KB) Date
PDF 2871 26 Mar 2020
Design files (6)
Title Type Size (KB) Date
PDF 223 26 Mar 2020
PDF 905 26 Mar 2020
ZIP 525 26 Mar 2020
ZIP 204 26 Mar 2020
PDF 103 21 Feb 2018
PDF 152 13 Feb 2018

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