SLUUCU8 july   2023

 

  1.   1
  2.   Description
  3.   Features
  4.   Applications
  5.   5
  6. 1Evaluation Module Overview
    1. 1.1 Introduction
    2. 1.2 Kit Contents
    3. 1.3 Specification
    4. 1.4 Device Information
  7. 2Hardware
    1. 2.1 Setup
    2. 2.2 Physical Access
      1. 2.2.1 Test Equipment and Setup
        1. 2.2.1.1 Power Supplies
        2. 2.2.1.2 Meters
        3. 2.2.1.3 Oscilloscope
        4. 2.2.1.4 Loads
    3. 2.3 General Configurations
  8. 3Implementation Results
    1. 3.1 Test Setup and Procedures
      1. 3.1.1 Power-Up and Power-Down With EN Control
      2. 3.1.2 Input Overvoltage Test
      3. 3.1.3 Output Hot-Short Test
  9. 4Hardware Design Files
    1. 4.1 Schematic
    2. 4.2 PCB Layout
    3. 4.3 Bill of Materials (BOM)
  10. 5Additional Information
    1.     Trademarks

1.4 Device Information

The LM74912-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 overcurrent and overvoltage protection. The wide input supply of 3 V to 65 V allows protection and control of 12-V and 24-V automotive battery powered ECUs. The device can withstand and protect the loads from negative supply voltages down to –65 V. An integrated ideal diode controller (DGATE) drives the first MOSFET to replace a Schottky diode for reverse input protection and output voltage holdup.

With a second MOSFET in the power path, the device allows load disconnect (ON/OFF control) in case of overcurrent and overvoltage events using HGATE control. The device has an integrated current sense amplifier, which provides external MOSFET VDS sense-based short circuit protection with an adjustable current limit. When short circuit condition is detected on the output, the device latches off the load disconnect MOSFET. The device features an adjustable overvoltage cut-off protection feature. The device features a SLEEP mode, which enables ultra-low quiescent current consumption (6-μA) and provides refresh current to the always ON loads when the vehicle is in the parking state. The LM74912-Q1 has a maximum voltage rating of 65 V.