User’s Guide
LM7480-Q1 Evaluation Module for Unsuppressed Load
Dump Protection: LM74800EVM-CS
ABSTRACT
This user’s guide describes the LM74800EVM-CS Evaluation Module for evaluating the performance of Ideal
Diode Controller with Switched Output LM74800-Q1 and LM74801-Q1. The LM7480x-Q1 ideal diode controller
drives and controls external back to back N-Channel MOSFETs to emulate an ideal diode rectifier with power
path ON/OFF control and over voltage protection.
Table of Contents
6 Board Layout and Bill of Materials
Trademarks
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1 Introduction
TI's LM74800 Evaluation Module LM74800EVM-CS helps designers evaluate the operation and performance of
the LM74800-Q1 ideal diode controller with switched output.The LM7480x-Q1 ideal diode controller drives and
controls external back-to-back N-Channel MOSFETs to emulate an ideal diode rectifier with power path ON/OFF
control and overvoltage protection. This evaluation module demonstrates how LM74800-Q1 along with two back-
to-back N-Channel MOSFETs configured in common-source topology can provide 200-V unsuppressed load
dump protection with reverse battery protection to the downstream circuit. The first gate drive HGATE controls
an external N-channel MOSFET to turn off or clamp output voltage to acceptable safe level and the second gate
drive DGATE controls another external N-Channel MOSFET to emulate an ideal diode.
1.1 Features
Key features of the EVM include:
• 12-V and 24-V automotive reverse battery protection
• Input operating range 3 V to 65 V
• 12-V battery protection 3 V to 40 V
• 24-V battery protection 3 V to 65 V
• 2-A Nominal, 2.5-A peak load current
• Supports 200-V unsuppressed load dump protection
• Enable ON/OFF control
• Programmable over voltage cutoff and output clamp operation
• Output voltage slew rate control
• LED Indication for Output ON/OFF detection
• On board TVS protection for automotive transient immunity
Table of Contents
SLVUBU4 – MARCH 2021
LM7480-Q1 Evaluation Module for Unsuppressed Load Dump Protection:
LM74800EVM-CS
1
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