TIDUFF0 December   2025

 

  1.   1
  2.   Description
  3.   Resources
  4.   Features
  5.   Applications
  6.   6
  7. 1System Description
    1. 1.1 Key System Specifications
  8. 2System Overview
    1. 2.1 Block Diagram
    2. 2.2 Design Considerations
    3. 2.3 Highlighted Products
      1. 2.3.1 AWR2188
      2. 2.3.2 DS90UB971S-Q1
      3. 2.3.3 MSPM0G3519-Q1
      4. 2.3.4 LM68635-Q1
      5. 2.3.5 LP8772x-Q1
      6. 2.3.6 TPS6285018A-Q1
      7. 2.3.7 CDC6C025000-Q1
  9. 3System Design Theory
    1. 3.1 Diagnostic and Monitoring Features
    2. 3.2 Power over Coax (PoC) Network
    3. 3.3 SPI and I2C Communication Interface
  10. 4Hardware, Software, Testing Requirements, and Test Results
    1. 4.1 Hardware Requirements
    2. 4.2 Software Requirements
    3. 4.3 Test Setup
      1. 4.3.1 Precautions
      2. 4.3.2 Data Capturing Approach
  11. 5Design and Documentation Support
    1. 5.1 Design Files
      1. 5.1.1 Schematics
      2. 5.1.2 BOM
      3. 5.1.3 PCB Layout Recommendations
        1. 5.1.3.1 Launch on Package (LOP Antenna)
        2. 5.1.3.2 Power over Coax (PoC)
        3. 5.1.3.3 PCB Layer Stackup
        4. 5.1.3.4 Board Photos
    2. 5.2 Tools and Software
    3. 5.3 Documentation Support
    4. 5.4 Support Resources
    5. 5.5 Trademarks
      1. 5.5.1 About the Author
  12. 6About the Author

2.3.5 LP8772x-Q1

The LP8772x-Q1 device meets the power management requirements of the AWR, IWR, and other Monolithic Microwave Integrated Circuits (MMIC) in various automotive and industrial radar applications. The device has three step-down DC/DC converters, an LDO regulator, and a load switch. The LDO receives external power and supplies an Ethernet device or any other device in the system. The load switch cuts off the 3.3V IO supply during the sensor sleep mode. The device operates through I2C communication interface and enable signals.

The low noise step-down DC/DC converters support factory programmed switching frequency of 17.6MHz or 8.8MHz or 4.4MHz. High switching frequency and low noise across wide frequency range, enables LDO-free power approach which helps to reduce the design cost and improve thermal performance. The switching clock is forced to PWM mode for excellent RF performance and can also be synchronized to an external clock. The LP8772x-Q1 device supports remote voltage sensing to compensate IR drop between the regulator output and the point-of-load (POL) which improves the accuracy of the output voltage.