SNVS523G September   2007  – January 2018 LM3103

PRODUCTION DATA.  

  1. Features
  2. Applications
  3. Description
    1.     Typical Application Schematic
  4. Revision History
  5. Pin Configuration and Functions
    1.     Pin Functions
  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 Typical Characteristics
  7. Detailed Description
    1. 7.1 Functional Block Diagram
    2. 7.2 Feature Description
      1. 7.2.1  COT Control Circuit Overview
      2. 7.2.2  Startup Regulator (VCC)
      3. 7.2.3  Regulation Comparator
      4. 7.2.4  Zero Coil Current Detect
      5. 7.2.5  Over-Voltage Comparator
      6. 7.2.6  ON-Time Timer, Shutdown
      7. 7.2.7  Current Limit
      8. 7.2.8  N-Channel MOSFET and Driver
      9. 7.2.9  Soft-Start
      10. 7.2.10 Thermal Protection
  8. Applications and Implementation
    1. 8.1 Application Information
      1. 8.1.1 External Components
  9. Device and Documentation Support
    1. 9.1 Receiving Notification of Documentation Updates
    2. 9.2 Community Resources
    3. 9.3 Trademarks
    4. 9.4 Electrostatic Discharge Caution
    5. 9.5 Glossary
  10. 10Mechanical, Packaging, and Orderable Information

Package Options

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

Typical Characteristics

All curves are taken at VIN = 18 V with the configuration in the typical application circuit for VOUT = 3.3 V shown in this datasheet. TA = 25°C, unless otherwise specified.
LM3103 30029703.pngFigure 1. Quiescent Current, IIN vs VIN
LM3103 30029705.pngFigure 3. VCC vs VIN
LM3103 30029707.pngFigure 5. Switching Frequency, fSW vs VIN
LM3103 30029709.pngFigure 7. RDS(on) vs Temperature
LM3103 30029711.pngFigure 9. VOUT Regulation vs Load Current (VOUT = 3.3 V)
LM3103 30029713.png
Figure 11. VOUT Regulation vs Load Current (VOUT = 0.6 V)
LM3103 30029715.pngFigure 13. Enable Transient (VOUT = 3.3 V, 0.75 A Loaded)
LM3103 30029717.pngFigure 15. Continuous Mode Operation (VOUT = 3.3 V, 2.5 A Loaded)
LM3103 30029719.pngFigure 17. DCM to CCM Transition (VOUT = 3.3 V, 0.01 A - 0.75 A Load)
LM3103 30029704.pngFigure 2. VCC vs ICC
LM3103 30029706.pngFigure 4. ton vs VIN
LM3103 30029708.pngFigure 6. VFB vs Temperature
LM3103 30029710.pngFigure 8. Efficiency vs Load Current (VOUT = 3.3 V)
LM3103 30029712.pngFigure 10. Efficiency vs Load Current (VOUT = 0.6 V)
LM3103 30029714.png
Figure 12. Power Up (VOUT = 3.3 V, 0.75 A Loaded)
LM3103 30029716.pngFigure 14. Shutdown Transient (VOUT = 3.3 V, 0.75 A Loaded)
LM3103 30029718.pngFigure 16. Discontinuous Mode Operation (VOUT = 3.3 V, 0.02 A Loaded)
LM3103 30029720.pngFigure 18. Load Transient (VOUT = 3.3 V, 0.075 A - 0.75 A Load, Current slew-rate: 2.5 A/µs)