SLVUCL2 july   2023 LMQ644A2-Q1

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1EVM Description
    1. 1.1 Features and Electrical Performance
  5. 2EVM Performance and Specifications
  6. 3EVM Photo
  7. 4Test Setup and Procedure
    1. 4.1 EVM Connections
    2. 4.2 Test Equipment
    3. 4.3 EVM Setup
      1. 4.3.1 Input Connections
      2. 4.3.2 Output Connections
  8. 5Test Data and Performance Curves
    1. 5.1 Efficiency and Load Regulation Performance
    2. 5.2 Waveforms and Plots
    3. 5.3 EMI Performance
    4. 5.4 Thermal Performance
  9. 6EVM Documentation
    1. 6.1 Schematic
    2. 6.2 Bill of Materials
    3. 6.3 PCB Layout
  10. 7Device and Documentation Support
    1. 7.1 Device Support
      1. 7.1.1 Development Support
        1. 7.1.1.1 Custom Design With WEBENCH® Tools
    2. 7.2 Documentation Support
      1. 7.2.1 Related Documentation

1 EVM Description

The LMQ644A2QEVM-S2100 evaluation board showcases the features and performance of the LMQ644A2-Q1, dual buck DC/DC converter with integrated power MOSFETs. The EVM provides a single 12-A output with dual-phase interleaved configuration. The output voltages can be programmed to a fixed 3.3 V, 5 V or adjustable using external feedback resistors.

The switching frequency at the full load is programmed to 2.1 MHz as a default. The switching mode at the light load is selectable between FPWM and AUTO mode. Also, spread spectrum can be enabled or disabled by a jumper selection. If an external pulse signal is applied to the SYNC pin, the switching frequency is synchronized to the external clock.