SNVU907A July   2024  – August 2024 LM5137-Q1 , LM5137F-Q1

 

  1.   1
  2.   Description
  3.   Get Started
  4.   Features
  5.   Applications
  6.   6
  7. 1Evaluation Module Overview
    1. 1.1 Introduction
    2. 1.2 Kit Contents
    3. 1.3 Specifications
      1. 1.3.1 Application Circuit Diagrams
    4. 1.4 Device Information
  8. 2Hardware
    1. 2.1 Test Setup and Procedure
      1. 2.1.1 EVM Connections
      2. 2.1.2 Test Equipment
      3. 2.1.3 Recommended Test Setup
        1. 2.1.3.1 Input Connections
        2. 2.1.3.2 Output Connections
      4. 2.1.4 Test Procedure
        1. 2.1.4.1 Line and Load Regulation, Efficiency
  9. 3Implementation Results
    1. 3.1 Test Data and Performance Curves
      1. 3.1.1 Efficiency
      2. 3.1.2 Operating Waveforms
        1. 3.1.2.1 Load Transient Response
        2. 3.1.2.2 Startup/Shutdown With VIN
        3. 3.1.2.3 Startup/Shutdown With ENABLE ON and OFF
        4. 3.1.2.4 Switching
      3. 3.1.3 Thermal Performance
  10. 4Hardware Design Files
    1. 4.1 Schematic
    2. 4.2 PCB Layout
      1. 4.2.1 Component Drawings
      2. 4.2.2 Layout Guidelines
    3. 4.3 Bill of Materials
  11. 5Additional Information
    1. 5.1 Trademarks
  12. 6Device and Documentation Support
    1. 6.1 Device Support
      1. 6.1.1 Development Support
    2. 6.2 Documentation Support
      1. 6.2.1 Related Documentation
        1. 6.2.1.1 PCB Layout Resources
        2. 6.2.1.2 Thermal Design Resources
  13. 7Revision History

1.1 Introduction

The LM25137F-Q1-EVM5D3 evaluation module (EVM) is a dual-channel synchronous buck DC/DC regulator that employs synchronous rectification to achieve high conversion efficiency in a small footprint. The EVM operates over a wide input voltage range of 6.5V to 36V, providing regulated outputs of 5V and 3.3V. The output voltages have better than 1% setpoint accuracy and are adjustable by modifying the feedback resistor values, permitting the user to customize the output voltage within a range of 2.5V to 8V as needed. Alternatively, as shown in Figure 1-2, the EVM is configurable as a two-phase, 40A single-output design by changing the COMP network configuration, the CNFG resistor, and connecting the outputs together.

Inherent protection features for robust design include input supply voltage, VCC and gate-drive UVLO; independent IMON, PG and FAULT indicator outputs for each channel; resistor-adjustable soft start; hiccup-mode overcurrent protection; and thermal shutdown with hysteresis. The selected power-train passive components, including 40V power MOSFETs, 1μH buck inductors, 2mΩ shunts, 10μF/50V ceramic input capacitors and 47μF/10V ceramic output capacitors – are AEC-Q200 rated and available from multiple component vendors.

The module design uses the LM25137-Q1 buck controller IC, which is specifically developed for functional safety applications and incorporates the following key features:

  • Wide VIN range of 4V to 42V
  • 100% duty cycle capability
  • Ultra-low shutdown and no-load standby quiescent currents
  • Multi-phase capability
  • Peak current-mode control loop architecture with slope compensation
  • Integrated, high-current MOSFET gate drivers with adaptive dead-time
  • Optional dual-random spread spectrum (DRSS) modulation for lower EMI
  • Independent current monitor (IMON), power good (PG) and FAULT indicator outputs on each channel