SNVU768 December   2021 LM63440-Q1 , LM63460-Q1 , LM64440-Q1 , LM64460-Q1

 

  1.   Trademarks
  2. 1High-Density EVM Description
    1. 1.1 Typical Applications
    2. 1.2 Features and Electrical Performance
  3. 2EVM Performance Specifications
  4. 3EVM Photo
  5. 4Test Setup and Procedure
    1. 4.1 EVM Connections
    2. 4.2 EVM Setup
    3. 4.3 Test Equipment
    4. 4.4 Recommended Test Setup
      1. 4.4.1 Input Connections
      2. 4.4.2 Output Connections
    5. 4.5 Test Procedure
      1. 4.5.1 Line/Load Regulation and Efficiency
  6. 5Test Data and Performance Curves
    1. 5.1 Conversion Efficiency
    2. 5.2 Output Voltage Regulation
    3. 5.3 Operating Waveforms
      1. 5.3.1 Start-Up and Enable ON/OFF
      2. 5.3.2 Line and Load Transients
      3. 5.3.3 Short Circuit and Recovery
    4. 5.4 Thermal Performance
    5. 5.5 EMI Results – CISPR 25 Class 5
      1. 5.5.1 Conducted EMI
      2. 5.5.2 Radiated EMI
  7. 6EVM Documentation
    1. 6.1 Schematics
      1. 6.1.1 LM63460EVM-2MHZ Schematic
      2. 6.1.2 LM64460EVM-2MHZ Schematic
    2. 6.2 Bill of Materials
      1. 6.2.1 Alternative BOM Configurations
    3. 6.3 PCB Layout
    4. 6.4 Assembly Drawings
  8. 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

Features and Electrical Performance

  • Complete 6-A buck power stage with integrated power MOSFETs and PWM controller
  • Wide input voltage operating range of 3 V to 36 V (absolute maximum rating of 42 V)
    • Input voltage UVLO turn-on and turn-off thresholds set at 4.5 V and 3.2 V, respectively
  • Default output voltage and switching frequency of 5 V and 2.1 MHz, respectively. The LM63460-Q1 has a resistor-programmable switching frequency from 200 kHz to 2.2 MHz using its RT pin, whereas the LM64460-Q1 has a default frequency of 2.1 MHz but is synchronizable over the same range.
  • High efficiency across a wide load-current range
    • Half-load and full-load efficiencies of 94.4% and 92.5% at VIN = 13.5 V
    • External bias option reduces no-load supply current and enhances thermal performance
  • Improved EMI performance for noise-sensitive automotive applications
    • Meets CISPR 25 Class 5 EMI standard for both conducted and radiated emissions
    • Input π-stage EMI filter with electrolytic capacitor for parallel damping
    • Parallel input and output paths with symmetrical capacitor layouts minimize radiated field coupling
    • Clock synchronization and optional FPWM mode provide constant switching frequency across the full load range
    • Integrated input, VCC, and bootstrap capacitors enable low-noise switching performance
    • Pseudo-random spread spectrum modulation (PRSS) for lower peak emissions
      • Included by default in the LM63460-Q1
      • Configurable in the LM64460-Q1 – connect the MODE/SYNC pin of the IC to VCC or GND to enable spread spectrum in FPWM and auto modes, respectively.
  • Peak current-mode control architecture enables fast line and load transient response
    • Integrated loop compensation components and frequency-proportional slope compensation
  • Inherent protection features for robust and reliable design
    • Overcurrent protection (OCP) with peak and valley current limits
    • Thermal shutdown protection with hysteresis
    • PGOOD indicator with 100-kΩ pullup resistor to VOUT
    • Resistor-programmable input voltage UVLO
  • Fully assembled, tested and proven, 4-layer PCB layout with 76-mm × 38-mm total footprint