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

2 Design Specifications

Table 2. Electrical Performance Characteristics

PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
INPUT CHARACTERISTICS
Input voltage range, VIN Operating 8 12 18 V
Transients 6 36
Input current, no load, IIN(NL) IOUT = 0 A, FPWM mode VIN = 8 V 132 mA
VIN = 12 V 130
VIN = 18 V 125
Input current, disabled, IIN(OFF) VEN = 0 V VIN = 12 V 16 µA
OUTPUT CHARACTERISTICS
Output voltage, VOUT(1) 4.95 5.0 5.05 V
Output current, IOUT VIN = 8 V to 18 V, Airflow = 100 LFM(2) 0 30 A
Output voltage regulation, ΔVOUT Load regulation IOUT = 0 A to 30 A 0.5%
Line regulation VIN = 8 V to 18 V 0.5%
Output voltage ripple, VOUT(AC) VIN = 12 V, IOUT = 30 A 10 mVrms
Output overcurrent protection, IOCP VIN = 12 V 40 A
Soft-start time, tSS CSS = 100 nF 3 ms
Hiccup time, tRES CRES = 220 nF 13 ms
SYSTEM CHARACTERISTICS
Switching frequency, FSW VIN = 12 V 2.1 MHz
Half-load efficiency, ηHALF(1) IOUT = 15 A VIN = 8 V 93.5%
VIN = 12 V 92.3%
VIN = 18 V 89.5%
Full load efficiency, ηFULL IOUT = 30 A VIN = 8 V 91.3%
VIN = 12 V 91.75%
VIN = 18 V 90%
LM5143-Q1 junction temperature, TJ –40 150 ºC
(1) The default output voltages of this design is 5 V. Efficiency and other performance metrics can change based on operating input voltage, load current, externally-connected output capacitors, and other parameters.
(2) The recommended airflow when operating at input voltages greater than 15 V is 100 LFM.