SNVU773A March   2021  – April 2022 LM25148 , LM25148-Q1 , LM25149 , LM25149-Q1 , LM5148 , LM5148-Q1 , LM5149 , LM5149-Q1

 

  1.   Trademarks
  2. 1High Density EVM Description
    1. 1.1 Typical Applications
    2. 1.2 Features and Electrical Performance
  3. 2EVM Characteristics
  4. 3Application Circuit Diagram
  5. 4EVM Photo
  6. 5Test Setup and Procedure
    1. 5.1 EVM Connections
    2. 5.2 Test Equipment
    3. 5.3 Recommended Test Setup
      1. 5.3.1 Input Connections
      2. 5.3.2 Output Connections
    4. 5.4 Test Procedure
      1. 5.4.1 Line and Load Regulation, Efficiency
  7. 6Test Data and Performance Curves
    1. 6.1 Conversion Efficiency
    2. 6.2 Operating Waveforms
      1. 6.2.1 Switching
      2. 6.2.2 Load Transient Response
      3. 6.2.3 Line Transient Response
      4. 6.2.4 Start-Up and Shutdown With ENABLE ON and OFF
      5. 6.2.5 Start-Up and Shutdown with EN Tied to VIN
    3. 6.3 Bode Plot
    4. 6.4 CISPR 25 EMI Performance
    5. 6.5 Thermal Performance
  8. 7EVM Documentation
    1. 7.1 Schematic
    2. 7.2 Bill of Materials
    3. 7.3 PCB Layout
    4. 7.4 Component Drawings
  9. 8Device and Documentation Support
    1. 8.1 Device Support
      1. 8.1.1 Development Support
    2. 8.2 Documentation Support
      1. 8.2.1 Related Documentation
        1. 8.2.1.1 PCB Layout Resources
        2. 8.2.1.2 Thermal Design Resources
  10. 9Revision History

2 EVM Characteristics

Table 2-1 lists the electrical characteristics.

Table 2-1 Electrical Performance Characteristics
PARAMETERTEST CONDITIONSMINTYPMAXUNIT
INPUT CHARACTERISTICS
Input voltage range, VINOperating5.51236V
Input current, no load, IIN-NLIOUT = 0 A, PFM tied to VDDA, UVLO removedVIN = 12 V12µA
VIN = 24 V9
VIN = 36 V9
Input current, shutdown, IIN-OFFVEN = 0 VVIN = 12 V3µA
OUTPUT CHARACTERISTICS
Output voltage, VOUT(1)4.9555.05V
Output current, IOUTVIN = 5.5 V to 36 V, airflow = 100 LFM(2)08A
Output voltage regulation, ΔVOUTLoad regulationIOUT = 0 A to 8 A0.1%
Line regulationVIN = 5.5 V to 36 V1%
Output voltage ripple, VOUT-ACVIN = 12 V, IOUT = 8 A5mVrms
Output overcurrent protection, IOCPVIN = 12 V10A
Soft-start time, tSS3ms
SYSTEM CHARACTERISTICS
Switching frequency, FSW-nomVIN = 12 V2.1MHz
Half-load efficiency, ηHALF(1)IOUT = 4 AVIN = 8 V94.3%
VIN = 12 V92.9%
VIN = 18 V90.5%
Full load efficiency, ηFULLIOUT = 8 AVIN = 8 V93.5%
VIN = 12 V92.8%
VIN = 18 V90.7%
LM25149-Q1 junction temperature, TJ–40150°C
(1) The default output voltage of this EVM is 5 V. Efficiency and other performance metrics can change based on operating input voltage, load currents, externally-connected output capacitors, and other parameters.
(2) The recommended airflow when operating at input voltages greater than 18 V is 100 LFM.