TIDUFB9 April   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
      1. 2.2.1 Reference Design Features
      2. 2.2.2 Switch Settings
    3. 2.3 Highlighted Products
      1. 2.3.1 IWRL6432W
      2. 2.3.2 Crystal
      3. 2.3.3 TPS6285020M – 1.8V DC/DC Regulator
      4. 2.3.4 QSPI Flash Memory
  9. 3System Design Theory
    1. 3.1 Antenna
      1. 3.1.1 Range and Phase Compensation
      2. 3.1.2 Chirp Configuration
    2. 3.2 PCB
  10. 4Hardware, Software, Testing Requirements, and Test Results
    1. 4.1 Hardware Requirements
      1. 4.1.1 Reference Design
      2. 4.1.2 Small Form-Factor Reference Design
    2. 4.2 Software Requirements
    3. 4.3 Test Setup
    4. 4.4 Test Results
      1. 4.4.1 Human Detection at 15 Meters in Boresight
      2. 4.4.2 Antenna Radiation Plots
      3. 4.4.3 Angle Estimation Accuracy
  11. 5Design and Documentation Support
    1. 5.1 Design Files
      1. 5.1.1 Schematics
      2. 5.1.2 BOM
    2. 5.2 Tools and Software
    3. 5.3 Documentation Support
    4. 5.4 Support Resources
    5. 5.5 Trademarks
  12. 6About the Authors

2.3.3 TPS6285020M – 1.8V DC/DC Regulator

The TPS6285020M is TI's 2A (continuous), high efficiency, synchronous step-down, fixed 1.8V output DC/DC converter which is used in this reference design to supply the 1.8V rail.

The peak current requirement from the 1.8V rail of the device needs to be met. See also the peak current requirement per voltage rail section in the IWRL6432 WCSP Single-Chip 57 to 64GHz Industrial Radar Sensor data sheet, for additional details. Along with the current requirement, the DC/DC regulator needs to have forced PWM mode (or auto mode of switching) and spread spectrum clocking (SSC) features.

Note: If overall system power consumption needs to be optimized in device's deep sleep conditions where typically light load conditions are followed, auto mode of switching can be enabled. In this mode, depending on light load conditions PFM mode of switching is enabled to reduce power consumption of the DC regulator. Auto mode and forced PWM switching mode can be altered using the MODE pin of the DC regulator. The MODE pin of the DC/DC regulator can be controlled by the device through a GPIO in a way that the DC/DC regulator switches between auto mode and forced PWM mode depending on the deep sleep entry and exit of the device. See also Enabling PFM Mode for DCDC Converter.