TIDUF35A June   2023  – October 2024 AM6442

 

  1.   1
  2.   Description
  3.   Resources
  4.   Features
  5.   Applications
  6.   6
  7. 1System Description
    1. 1.1 Terminology
  8. 2System Overview
    1. 2.1 Block Diagram
    2. 2.2 Design Considerations
    3. 2.3 Highlighted Products
      1. 2.3.1  AM6442 Microprocessor
      2. 2.3.2  DP83867 gigabit Ethernet Physical Transceiver
      3. 2.3.3  DP83TD510E Single-Pair Ethernet Physical Transceiver
      4. 2.3.4  MSPM0G1107 Microcontroller
      5. 2.3.5  LMK1C1106 6-Channel Output LVCMOS 1.8V Buffer
      6. 2.3.6  LMK6C Low-Jitter, High-Performance, Bulk-Acoustic-Wave (BAW) Fixed-Frequency LVCMOS Oscillator
      7. 2.3.7  TLVM13630 High-Density, 3V to 36V Input, 1V to 6V Output, 3A Step-Down Power Module
      8. 2.3.8  LM74700-Q1 Reverse-Polarity Protection Ideal Diode
      9. 2.3.9  TPS62825A Synchronous Step-Down DC-DC Converter
      10. 2.3.10 LMR36006 Ultra-Small Synchronous Step-Down Converter
      11. 2.3.11 TLV62568A High-Efficiency Step-Down Buck Converter With Forced PWM
  9. 3System Design Theory
    1. 3.1 Power Subsystem
    2. 3.2 AM6442 System on Module Subsystem
    3. 3.3 Ethernet Subsystem
    4. 3.4 Power Over Data Line (PoDL) Subsystem
    5. 3.5 Additional Subsystems
      1. 3.5.1 USB 3.1 Interface
      2. 3.5.2 Micro SD Card Interface
      3. 3.5.3 SimpleLink CC3301 Wi-Fi 6 and Bluetooth Low-Energy BoosterPack Interface
      4. 3.5.4 AM6442 UART Interface
  10. 4Hardware, Software, Testing Requirements, and Test Results
    1. 4.1 Hardware Requirements
      1. 4.1.1 Board Interface
        1. 4.1.1.1 Boot Switch Configuration
        2. 4.1.1.2 Starting up the Reference Design
    2. 4.2 Software Requirements
      1. 4.2.1 PoDL PSE Protocol Programming
      2. 4.2.2 Create an SD Card Image With U-Boot and Linux
    3. 4.3 Test Setup and Procedure
  11. 5Design and Documentation Support
    1. 5.1 Design Files
      1. 5.1.1 Schematics
      2. 5.1.2 BOM
    2. 5.2 Documentation Support
    3. 5.3 Support Resources
    4. 5.4 Trademarks
  12. 6About the Author
  13. 7Revision History

2.3.8 LM74700-Q1 Reverse-Polarity Protection Ideal Diode

The LM74700-Q1 is an ideal diode controller which operates in conjunction with an external N-channel MOSFET as an ideal diode rectifier for low-loss reverse-polarity protection with a 20mV forward voltage drop. The wide supply input range of 3.2V to 65V allows control of many popular DC bus voltages such as 24V industrial systems.

In this reference design, the LM74700-Q1 acts as reverse polarity protection for the 24V system input voltage.