SNVSCF4 July   2025 LM25139-Q1

PRODUCTION DATA  

  1.   1
  2. Features
  3. Applications
  4. Description
  5. Pin Configuration and Functions
    1. 4.1 Wettable Flanks
  6. Specifications
    1. 5.1 Absolute Maximum Ratings
    2. 5.2 ESD Ratings 
    3. 5.3 Recommended Operating Conditions
    4. 5.4 Thermal Information
    5. 5.5 Electrical Characteristics
    6. 5.6 Typical Characteristics
  7. Detailed Description
    1. 6.1 Overview
    2. 6.2 Functional Block Diagram
    3. 6.3 Feature Description
      1. 6.3.1  Input Voltage Range (VIN )
      2. 6.3.2  High-Voltage Bias Supply Regulator (VCC)
      3. 6.3.3  Precision Enable (EN)
      4. 6.3.4  Power-Good Monitor (PG)
      5. 6.3.5  Switching Frequency (RT)
      6. 6.3.6  Dual Random Spread Spectrum (DRSS)
      7. 6.3.7  Soft Start
      8. 6.3.8  Output Voltage Setpoint (FB)
      9. 6.3.9  Minimum Controllable On Time
      10. 6.3.10 Error Amplifier and PWM Comparator (FB)
      11. 6.3.11 Slope Compensation
      12. 6.3.12 Inductor Current Sense (ISNS, VOUT)
        1. 6.3.12.1 Shunt Current Sensing
        2. 6.3.12.2 Inductor DCR Current Sensing
        3. 6.3.12.3 Hiccup-Mode Current Limiting
    4. 6.4 Device Functional Modes
      1. 6.4.1 Sleep Mode
      2. 6.4.2 Forced PWM and Synchronization (FPWM/SYNC)
      3. 6.4.3 Thermal Shutdown
  8. Application and Implementation
    1. 7.1 Application Information
      1. 7.1.1 Power Train Components
        1. 7.1.1.1 Buck Inductor
        2. 7.1.1.2 Output Capacitors
        3. 7.1.1.3 Input Capacitors
        4. 7.1.1.4 Power MOSFETs
        5. 7.1.1.5 EMI Filter
      2. 7.1.2 Error Amplifier and Compensation
    2. 7.2 Typical Applications
      1. 7.2.1 Design 1 – High Efficiency 2.2MHz Synchronous Buck Regulator
        1. 7.2.1.1 Design Requirements
        2. 7.2.1.2 Detailed Design Procedure
          1. 7.2.1.2.1 Custom Design With WEBENCH® Tools
          2. 7.2.1.2.2 Buck Inductor
          3. 7.2.1.2.3 Current-Sense Components
          4. 7.2.1.2.4 Output Capacitors
          5. 7.2.1.2.5 Input Capacitors
          6. 7.2.1.2.6 Frequency Set Resistor
          7. 7.2.1.2.7 Feedback Resistors
          8. 7.2.1.2.8 Compensation Components
        3. 7.2.1.3 Application Curves
      2. 7.2.2 Design 2 – High-Efficiency, 440kHz, Synchronous Buck Regulator
        1. 7.2.2.1 Design Requirements
        2. 7.2.2.2 Detailed Design Procedure
        3. 7.2.2.3 Application Curves
    3. 7.3 Power Supply Recommendations
    4. 7.4 Layout
      1. 7.4.1 Layout Guidelines
        1. 7.4.1.1 Power Stage Layout
        2. 7.4.1.2 Gate Drive Layout
        3. 7.4.1.3 PWM Controller Layout
        4. 7.4.1.4 Thermal Design and Layout
        5. 7.4.1.5 Ground Plane Design
      2. 7.4.2 Layout Example
  9. Device and Documentation Support
    1. 8.1 Device Support
      1. 8.1.1 Development Support
        1. 8.1.1.1 Custom Design With WEBENCH® Tools
    2. 8.2 Documentation Support
      1. 8.2.1 Related Documentation
        1. 8.2.1.1 Low-EMI Design Resources
        2. 8.2.1.2 Thermal Design Resources
        3. 8.2.1.3 PCB Layout Resources
    3. 8.3 Receiving Notification of Documentation Updates
    4. 8.4 Support Resources
    5. 8.5 Trademarks
    6. 8.6 Electrostatic Discharge Caution
    7. 8.7 Glossary
  10. Revision History
  11. 10Mechanical, Packaging, and Orderable Information

Package Options

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

Typical Characteristics

VIN = 12V, TJ = 25°C, unless otherwise stated.

LM25139-Q1 Efficiency vs Load, 3.3V Output, FPWM
See Section 7.2.2 VOUT = 3.3V FSW = 440kHz
Figure 5-1 Efficiency vs Load, 3.3V Output, FPWM
LM25139-Q1 Efficiency vs Load, 5V Output, FPWM
See Section 7.2.1 VOUT = 5V FSW = 2.2MHz
Figure 5-3 Efficiency vs Load, 5V Output, FPWM
LM25139-Q1 Start-Up Characteristic
See Section 7.2.2 8A resistive load
Figure 5-5 Start-Up Characteristic
LM25139-Q1 Shutdown Quiescent Current vs Temperature
VEN = 0V
Figure 5-7 Shutdown Quiescent Current vs Temperature
LM25139-Q1 Sleep
                        Quiescent Current vs Temperature
VVOUT = 5V, VEN = 0V
Figure 5-9 Sleep Quiescent Current vs Temperature
LM25139-Q1 Fixed
                        5V Output Voltage vs TemperatureFigure 5-11 Fixed 5V Output Voltage vs Temperature
LM25139-Q1 PG UV
                        Thresholds vs TemperatureFigure 5-13 PG UV Thresholds vs Temperature
LM25139-Q1 VCC
                        Regulation Voltage vs Temperature
IVCC = 20mA
Figure 5-15 VCC Regulation Voltage vs Temperature
LM25139-Q1 VCC
                        Current Limit vs TemperatureFigure 5-17 VCC Current Limit vs Temperature
LM25139-Q1 Current Sense Threshold vs TemperatureFigure 5-19 Current Sense Threshold vs Temperature
LM25139-Q1 Efficiency vs Load, 3.3V Output, PFM
See Section 7.2.2 VOUT = 3.3V FSW = 440kHz
Figure 5-2 Efficiency vs Load, 3.3V Output, PFM
LM25139-Q1 Efficiency vs Load, 5V Output, PFM
See Section 7.2.1 VOUT = 5V FSW = 2.2MHz
Figure 5-4 Efficiency vs Load, 5V Output, PFM
LM25139-Q1 Load
                        Transient Response
IOUT = 0A to 10A VOUT = 5V 2A/µs slew rate
Figure 5-6 Load Transient Response
LM25139-Q1 
                        Standby Quiescent Current vs Temperature
0.6V < VEN < 1V
Figure 5-8 Standby Quiescent Current vs Temperature
LM25139-Q1 Fixed
                        3.3V Output Voltage vs TemperatureFigure 5-10 Fixed 3.3V Output Voltage vs Temperature
LM25139-Q1 Feedback Voltage vs TemperatureFigure 5-12 Feedback Voltage vs Temperature
LM25139-Q1 PG OV
                        Thresholds vs TemperatureFigure 5-14 PG OV Thresholds vs Temperature
LM25139-Q1 VCC
                        UVLO Thresholds vs TemperatureFigure 5-16 VCC UVLO Thresholds vs Temperature
LM25139-Q1 EN
                        Rising Threshold Voltage vs TemperatureFigure 5-18 EN Rising Threshold Voltage vs Temperature
LM25139-Q1 RT
                        Resistance vs Switching FrequencyFigure 5-20 RT Resistance vs Switching Frequency