SNOAA94 june   2023 LM74900-Q1 , LM74910-Q1

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1 LM749x0-Q1 Ideal Diode Controller Overview
  5. 2 Design 1: Automotive Reverse Battery Protection with Overvoltage, Undervoltage and Overcurrent Protection with Fault Output
  6. 3 Design 2: LM749x0-Q1 as Ideal Diode Controller with Current Monitoring, Overcurrent and Undervoltage Fault Indication
  7. 4 Design 3: LM749x0-Q1 as High Side Driver with Undervoltage, Overvoltage and Overcurrent Protection
  8. 5 Feature Comparison: LM749x0-Q1 as Ideal Diode FET and High Side Driver Topology
  9. 6 Design 4: Dual Supply OR-ing with Common Powerpath Disconnect Function
  10. 7 Design 5: LM749x0-Q1 as Priority Power MUX Controller
  11. 8 Feature Comparison: Dual OR-ing and Priority Power MUX Controller Topologies
  12. 9 Summary
  13. 10References

Abstract

With the emergence of new trends in automotive electronics such as autonomous driving, Advanced Driver Assistance Systems (ADAS), advanced car infotainment systems, system designers are facing new challenges, particularly in designing automotive front-end power systems. With rise in Electronic Control Unit (ECU) processing power typically ranging from 100 W–1000 W, traditional reverse polarity protection solutions such as Schottky diodes and P-FETs no longer become a viable solution at these system power levels due to poor efficiency, need of thermal management, and an increase in PCB space. Keeping system level safety in mind ,redundancy requirements especially in autonomous driving are pushing need for newer system architectures like input supply ORing and power MUXing in dual battery-based systems. Robust protection requirements during stringent automotive Electromagnetic Compatibility (EMC) testing adds another layer of complexity while designing these front-end power systems.

This application note highlights how the new LM749x0-Q1 dual gate drive ideal diode controller with integrated overvoltage and overcurrent protection enables various front-end protection circuit design architectures based on system requirements.