SNVSAU1 March   2017 LM25141

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
      3. 8.2.3 Inductor Calculation
      4. 8.2.4 Current Sense Resistor
      5. 8.2.5 Output Capacitor
      6. 8.2.6 Input Filter
        1. 8.2.6.1 EMI Filter Design
        2. 8.2.6.2 MOSFET Selection
        3. 8.2.6.3 Driver Slew Rate Control
        4. 8.2.6.4 Frequency Dithering
      7. 8.2.7 8.9 Control Loop
        1. 8.2.7.1 Feedback Compensator
      8. 8.2.8 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 Custom Design With WEBENCH® Tools
    2. 11.2 Receiving Notification of Documentation Updates
    3. 11.3 Community Resources
    4. 11.4 Trademarks
    5. 11.5 Electrostatic Discharge Caution
    6. 11.6 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
Orderable Information

6.7 Typical Characteristics

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