Automotive Reverse Polarity Protection Reference Design
TIDA-00992
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Key Document

Description

Reverse polarity is standard protection required in an automotive environment. When battery cables are detached and reconnected there is a probability of connecting the wires to wrong terminals of the battery. This mistake could damage the components in Electronic Control Units (ECU). To avoid damage to the ECU there is a need for reverse polarity protection. Schotky diodes could be used but will have a constantly high power loss.  This reference design uses the LM5050-Q1 along with n-channel mosfet to provide reverse polarity protection and reduce the power dissipation.

Features
  • Reverse polarity protection for 12V/24V/48V
  • Oring controller to connect multiple batteries
  • Improves system efficiency and very low quiescent current
  • Replaces the Schottky diode and reduces the power dissipation
  • ISO7637-2 and ISO16750-2 compliant

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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 (2)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
CSD19532Q5B  100V, N ch NexFET MOSFETâ„¢, single SON5x6, 4.9mOhm  MOSFETs  Sample & Buy View Design Kits & Evaluation Modules
LM5050-1-Q1  5-V to 75-V, 400-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)
LM5050-1-Q1 Download Download

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Technical documentation

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User guides (1)
Title Type Size (KB) Date
PDF 4269 09 Nov 2016
Design files (6)
Title Type Size (KB) Date
ZIP 379 30 Aug 2016
ZIP 451 30 Aug 2016
PDF 585 30 Aug 2016
PDF 72 30 Aug 2016
PDF 60 30 Aug 2016
PDF 272 30 Aug 2016

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