SNVS031N April   2000  – June 2025 LM2676

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Pin Configuration and Functions
  6. 5 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: LM2676 – 3.3 V
    6. 5.6  Electrical Characteristics: LM2676 – 5 V
    7. 5.7  Electrical Characteristics: LM2676 – 12 V
    8. 5.8  Electrical Characteristics: LM2676 – Adjustable
    9. 5.9  Electrical Characteristics – All Output Voltage Versions
    10. 5.10 Typical Characteristics
  7. 6 Detailed Description
    1. 6.1 Overview
    2. 6.2 Functional Block Diagram
    3. 6.3 Feature Description
      1. 6.3.1 Switch Output
      2. 6.3.2 Input
      3. 6.3.3 C Boost
      4. 6.3.4 Ground
      5. 6.3.5 Feedback
      6. 6.3.6 ON/OFF
    4. 6.4 Device Functional Modes
      1. 6.4.1 Shutdown Mode
      2. 6.4.2 Active Mode
  8. 7 Application and Implementation
    1. 7.1 Application Information
      1. 7.1.1 Design Considerations
      2. 7.1.2 Inductor
      3. 7.1.3 Output Capacitor
      4. 7.1.4 Input Capacitor
      5. 7.1.5 Catch Diode
      6. 7.1.6 Boost Capacitor
      7. 7.1.7 Additional Application Information
    2. 7.2 Typical Applications
      1. 7.2.1 Typical Application for All Output Voltage Versions
        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 Capacitor Selection Guides
          3. 7.2.1.2.3 Inductor Selection Guides
      2. 7.2.2 Application Curves
      3. 7.2.3 Fixed Output Voltage Application
        1. 7.2.3.1 Design Requirements
        2. 7.2.3.2 Detailed Design Procedure
          1. 7.2.3.2.1 Capacitor Selection
      4. 7.2.4 Adjustable Output Voltage Application
        1. 7.2.4.1 Design Requirements
        2. 7.2.4.2 Detailed Design Procedure
          1. 7.2.4.2.1 Capacitor Selection
    3. 7.3 Power Supply Recommendations
    4. 7.4 Layout
      1. 7.4.1 Layout Guidelines
      2. 7.4.2 Layout Example
  9. 8 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
    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. 9 Revision History
  11. 10Mechanical, Packaging, and Orderable Information
    1. 10.1 DAP (VSON Package)

5.10 Typical Characteristics

LM2676 Normalized Output VoltageFigure 5-1 Normalized Output Voltage
LM2676 Efficiency versus Input VoltageFigure 5-3 Efficiency versus Input Voltage
LM2676 Switch Current LimitFigure 5-5 Switch Current Limit
LM2676 Standby Quiescent CurrentFigure 5-7 Standby Quiescent Current
LM2676 ON/ OFF Pin Current (Sourcing)Figure 5-9 ON/ OFF Pin Current (Sourcing)
LM2676 Feedback Pin Bias Current
Figure 5-11 Feedback Pin Bias Current
LM2676 Horizontal Time Base: 1 µs/div
Discontinuous Mode Switching Waveforms VIN = 20 V, VOUT = 5 V, ILOAD = 500 mA L = 10 µH, COUT = 400 µF, COUTESR = 13 mΩ
A: VSW Pin Voltage, 10 V/div.
B: Inductor Current, 1 A/div
C: Output Ripple Voltage, 20 mV/div AC-Coupled
Figure 5-13 Horizontal Time Base: 1 µs/div
LM2676 Horizontal Time Base: 200 µs/div
Load Transient Response for Discontinuous Mode VIN = 20 V, VOUT = 5 V, L = 10 µH, COUT = 400 µF, COUTESR = 13 mΩ
A: Output Voltage, 100 mV/div, AC-Coupled
B: Load Current: 200-mA to 3-A Load Pulse
Figure 5-15 Horizontal Time Base: 200 µs/div
LM2676 Line RegulationFigure 5-2 Line Regulation
LM2676 Efficiency versus ILOADFigure 5-4 Efficiency versus ILOAD
LM2676 Operating Quiescent CurrentFigure 5-6 Operating Quiescent Current
LM2676 ON/OFF Threshold VoltageFigure 5-8 ON/OFF Threshold Voltage
LM2676 Switching FrequencyFigure 5-10 Switching Frequency
LM2676 Horizontal Time Base: 1 µs/div
Continuous Mode Switching Waveforms VIN = 20 V, VOUT = 5 V, ILOAD = 3 A L = 33 µH, COUT = 200 µF, COUTESR = 26 mΩ
A: VSW Pin Voltage, 10 V/div.
B: Inductor Current, 1 A/div
C: Output Ripple Voltage, 20 mV/div AC-Coupled
Figure 5-12 Horizontal Time Base: 1 µs/div
LM2676 Horizontal Time Base: 100 µs/div
Load Transient Response for Continuous Mode VIN = 20 V, VOUT = 5 V L = 33 µH, COUT = 200 µF, COUTESR = 26 mΩ
A: Output Voltage, 100 mV//div, AC-Coupled.
B: Load Current: 500-mA to 3-A Load Pulse
Figure 5-14 Horizontal Time Base: 100 µs/div