Automotive transient and overcurrent protection filter reference design
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Key Document


This reference design showcases a protection system for voltage and current transient events typically found in automotive systems. This reference design optimizes functionality, size and protection capabilities while not sacrificing power delivery for premium audio amplifiers.

  • Ideal diode controller with external back-to-back N-channel MOSFETs for overvoltage protection and to emulate an ideal diode rectifier
  • Over-current protection along with analog current monitoring
  • Easily scalable solution for varying load sizes

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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 (3)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
INA302-Q1  AEC-Q100, 36V, bi-directional, 550kHz, 4V/µs, high-precision current sense amp w/ dual comparators  Current sense amplifiers  Sample & Buy View Design Kits & Evaluation Modules
LM7481-Q1  Automotive ideal diode controller with active rectification driving B2B NFETs  Power switches  Sample & Buy View Design Kits & Evaluation Modules
TPS7B69-Q1  Automotive 150-mA, off-battery (40-V), high-PSRR, low-IQ, low-dropout voltage regulator  Power management  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
INA302-Q1 Download
LM7481-Q1 Download Download
TPS7B69-Q1 Download
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Technical documentation

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Data sheet (1)
Title Type Size (KB) Date
PDF 7036 07 Dec 2020
User guide (1)
Title Type Size (KB) Date
PDF 4660 12 Oct 2020
Design files (6)
Title Type Size (KB) Date
ZIP 725 12 Oct 2020
ZIP 2084 12 Oct 2020
PDF 874 12 Oct 2020
PDF 211 12 Oct 2020
PDF 97 12 Oct 2020
PDF 229 12 Oct 2020

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