SNVA870A March   2019  – April  2020 LM25143 , LM25143-Q1 , LM5143 , LM5143-Q1 , LM5143A-Q1

 

  1.   LM5143-Q1 4-phase Buck Regulator Design for Automotive ADAS Applications
    1.     Trademarks
    2. 1 High Density Reference Design Description
      1. 1.1 Typical Applications
      2. 1.2 Features and Electrical Performance
    3. 2 Design Specifications
    4. 3 Application Circuit Diagram
    5. 4 Photo
    6. 5 Test Data and Performance Curves
      1. 5.1 Conversion Efficiency
    7. 6 EVM Documentation
      1. 6.1 Schematic
      2. 6.2 Bill of Materials
      3. 6.3 PCB Layout
    8. 7 Device and Documentation Support
      1. 7.1 Device Support
        1. 7.1.1 Development Support
      2. 7.2 Documentation Support
        1. 7.2.1 Related Documentation
          1. 7.2.1.1 PCB Layout Resources
          2. 7.2.1.2 Thermal Design Resources
  2.   Revision History

Features and Electrical Performance

  • Tightly-regulated output voltage of 5 V with better than ±1% setpoint accuracy
  • Wide input voltage operating range of 8 V to 18 V (with transients from 6 V to 36 V)
  • Single--output configurations
    • Single output, four-phase solution provides 30 A
  • Switching frequency of 2.1 MHz externally synchronizable up or down by 20%
  • Ultra-high power conversion efficiency across wide load current ranges
    • Half-load efficiency of 92.3% at VIN = 12 V
    • Full-load efficiency of 91.75% at VIN = 12 V
  • Input π-stage EMI filter with electrolytic capacitor for parallel damping
    • Two-stage differential-mode EMI filter
    • Meets CISPR 25 and UNECE Reg 10 EMI standards
  • Peak current-mode control architecture provides fast line and load transient response
    • Integrated slope compensation adaptive with switching frequency
    • Forced PWM (FPWM) or diode emulation mode (DEM) operation
  • Integrated high-side and low-side power MOSFET gate drivers
    • 3.25-A and 4.25-A sink/source gate drive current capability
    • Independent source and sink gate driver pins for adjustable switch (SW) voltage slew rate
    • 14-ns adaptive dead-time control reduces power dissipation and MOSFET temperature rise
  • Overcurrent protection (OCP) with shunt or inductor DCR current sensing
  • Monotonic prebias output voltage startup
  • User-adjustable soft-start time set to 3 ms by 100-nF capacitors connected between SS pins and AGND
  • SYNCOUT signal 90° out-of-phase with internal clock
  • Power Good indicator with 100-kΩ pullup resistors to VCC
  • Fully assembled, tested, and proven PCB layout with 105-mm × 75-mm total footprint