SNVSAP9A March   2017  – February 2018 LM25141-Q1

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
    1.     Device Images
      1.      Simplified Schematic
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
    1.     Pin Functions
  6. 6 Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 ESD Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information
    5. 6.5 Electrical Characteristics
    6. 6.6 Switching Characteristics
    7. 6.7 Typical Characteristics
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1  High Voltage Start-Up Regulator
      2. 7.3.2  VCC Regulator
      3. 7.3.3  Oscillator
      4. 7.3.4  Synchronization
      5. 7.3.5  Frequency Dithering (Spread Spectrum)
      6. 7.3.6  Enable
      7. 7.3.7  Power Good
      8. 7.3.8  Output Voltage
        1. 7.3.8.1 Minimum Output Voltage Adjustment
      9. 7.3.9  Current Sense
      10. 7.3.10 DCR Current Sensing
      11. 7.3.11 Error Amplifier and PWM Comparator
      12. 7.3.12 Slope Compensation
      13. 7.3.13 Hiccup Mode Current Limiting
      14. 7.3.14 Standby Mode
      15. 7.3.15 Soft Start
      16. 7.3.16 Diode Emulation
      17. 7.3.17 High- and Low-Side Drivers
  8. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
        1. 8.2.2.1 Custom Design With WEBENCH® Tools
        2. 8.2.2.2 Inductor Calculation
        3. 8.2.2.3 Current Sense Resistor
        4. 8.2.2.4 Output Capacitor
        5. 8.2.2.5 Input Filter
          1. 8.2.2.5.1 EMI Filter Design
          2. 8.2.2.5.2 MOSFET Selection
          3. 8.2.2.5.3 Driver Slew Rate Control
          4. 8.2.2.5.4 Frequency Dithering
        6. 8.2.2.6 Control Loop
          1. 8.2.2.6.1 Feedback Compensator
      3. 8.2.3 Application Curves
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
      1. 10.1.1 Layout Procedure
    2. 10.2 Layout Examples
  11. 11Device and Documentation Support
    1. 11.1 Device Support
      1. 11.1.1 Development Support
        1. 11.1.1.1 Custom Design With WEBENCH® Tools
    2. 11.2 Documentation Support
      1. 11.2.1 Related Documentation
        1. 11.2.1.1 PCB Layout Resources
        2. 11.2.1.2 Thermal Design Resources
    3. 11.3 Receiving Notification of Documentation Updates
    4. 11.4 Community Resources
    5. 11.5 Trademarks
    6. 11.6 Electrostatic Discharge Caution
    7. 11.7 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

6.7 Typical Characteristics

At TA = 25ºC, unless otherwise noted
LM25141-Q1 D001_SNVSAJ6.gif
VIN 8–18 V EN = 12 V 2.2 MHz
VOUT 5 V FPWM
Figure 1. Efficiency vs IOUT
LM25141-Q1 D003_SNVSAJ6.gif
EN = 12 V
Figure 3. ISTANDBY vs VIN
LM25141-Q1 D005_SNVSAJ6.gif
VIN 6–18 V EN = GND
Figure 5. VCC(REG) vs VIN
LM25141-Q1 D007_SNVSAJ6.gif
VCC Rising EN = 12 V
Figure 7. VDD(REG) vs Temperature
LM25141-Q1 D009_SNVSAJ6.gif
VCC Rising EN = 12 V
Figure 9. VCCX(ON) vs Temperature
LM25141-Q1 D011_SNVSAJ6.gif
VIN = 12 V FB = VDDA EN = 12 V
Figure 11. 3.3-V Output Voltage Regulation vs IOUT
LM25141-Q1 D013_SNVSAJ6.gif
VIN = 12 V EN = 12 V OSC = VDDA
Figure 13. 2.2-MHz Oscillator Frequency vs Temperature
LM25141-Q1 D015_SNVSAJ6.gif
VIN = 18 V
Figure 15. ton Minimum vs Temperature
LM25141-Q1 D017_SNVSAJ6.gif
VIN = 12 V
Figure 17. RT Frequency vs Temperature (2.2 MHz)
LM25141-Q1 D002_SNVSAJ6.gif
VIN 8–18 V EN = 12 V 2.2 MHz
VOUT 5 V DEMB
Figure 2. Efficiency vs IOUT
LM25141-Q1 D004_SNVSAJ6.gif
VIN 8–18 V EN = 0 V
Figure 4. ISHUTDOWN vs Temperature
LM25141-Q1 D006_SNVSAJ6.gif
VIN 8–18 V EN = 12 V
Figure 6. VCC(UVLO) vs Temperature
LM25141-Q1 D008_SNVSAJ6.gif
VCC Rising EN = 12 V
Figure 8. VDD(UVLO) vs Temperature
LM25141-Q1 D010_SNVSAJ6.gif
VIN = 12 V EN = 12 V
Figure 10. Current Sense Amplifier Gain vs Temperature
LM25141-Q1 D012_SNVSAJ6.gif
VIN = 12 V EN = 12 V FB = GND
Figure 12. 5-V Output Voltage Regulation vs IOUT
LM25141-Q1 D014_SNVSAJ6.gif
VIN = 12 V EN = 12 V OSC = AGND
Figure 14. 440-kHz Oscillator Frequency vs Temperature
LM25141-Q1 D016_SNVSAJ6.gif
VIN = 3.8 V VOUT 3.3 V
Figure 16. toff Minimum vs Temperature
LM25141-Q1 D018_SNVSAJ6.gif
VIN = 12 V
Figure 18. RT Frequency vs Temperature (440 kHz)