TIDUF54 August   2025

 

  1.   1
  2.   Description
  3.   Resources
  4.   Features
  5.   Applications
  6.   6
  7. 1System Description
  8. 2System Overview
    1. 2.1 Block Diagram
    2. 2.2 Design Considerations
    3. 2.3 Highlighted Products
      1. 2.3.1 TPS6521905-Q1
      2. 2.3.2 LM74900-Q1
      3. 2.3.3 LMQ66430-Q1
      4. 2.3.4 TPS22995H-Q1
      5. 2.3.5 TPS51200A-Q1
      6. 2.3.6 TPS7B4255-Q1
      7. 2.3.7 MSPM0L1306-Q1
  9. 3Hardware, Software, Testing Requirements, and Test Results
    1. 3.1 Hardware Requirements
    2. 3.2 Software Requirements
    3. 3.3 Test Setup
    4. 3.4 Test Results
      1. 3.4.1 LMQ66430-Q1
      2. 3.4.2 TPS65219-Q1
    5. 3.5 Quick Start Guide
  10. 4Design and Documentation Support
    1. 4.1 Design Files
      1. 4.1.1 Schematics
      2. 4.1.2 BOM
    2. 4.2 Tools and Software
    3. 4.3 Documentation Support
    4. 4.4 Support Resources
    5. 4.5 Trademarks

2.3.2 LM74900-Q1

TIDA-050071 LM74900-Q1 Functional Block Diagram Figure 2-3 LM74900-Q1 Functional Block Diagram

The LM74900-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 with overcurrent and overvoltage protection. The wide input supply of 3V to 65V allows protection and control of 12V and 24V automotive battery powered ECUs. The device can withstand and protect the loads from negative supply voltages down to –65V. 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 integrated current sense amplifier which provides accurate current monitoring with adjustable overcurrent and short circuit thresholds. The device features an adjustable overvoltage cut-off protection feature. The device features a SLEEP mode which enables ultra-low quiescent current consumption (6µA) and at the same time providing refresh current to the always ON loads when vehicle is in the parking state. The LM74900-Q1 has a maximum voltage rating of 65V.