SNVSA82C April   2015  – October 2017 LM43603-Q1

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Pin Configuration and 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 Timing Requirements
    7. 6.7 Switching Characteristics
    8. 6.8 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  Fixed Frequency Peak Current Mode Controlled Step-Down Regulator
      2. 7.3.2  Light Load Operation
      3. 7.3.3  Adjustable Output Voltage
      4. 7.3.4  Enable (EN)
      5. 7.3.5  VCC, UVLO, and BIAS
      6. 7.3.6  Soft-Start and Voltage Tracking (SS/TRK)
      7. 7.3.7  Switching Frequency (RT) and Synchronization (SYNC)
      8. 7.3.8  Minimum ON Time, Minimum OFF Time and Frequency Foldback at Dropout Conditions
      9. 7.3.9  Internal Compensation and CFF
      10. 7.3.10 Bootstrap Voltage (BOOT)
      11. 7.3.11 Power Good (PGOOD)
      12. 7.3.12 Overcurrent and Short-Circuit Protection
      13. 7.3.13 Thermal Shutdown
    4. 7.4 Device Functional Modes
      1. 7.4.1 Shutdown Mode
      2. 7.4.2 Stand-by Mode
      3. 7.4.3 Active Mode
      4. 7.4.4 CCM Mode
      5. 7.4.5 Light Load Operation
      6. 7.4.6 Self-Bias Mode
  8. 8 Applications and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Applications
      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  Output Voltage Setpoint
        3. 8.2.2.3  Switching Frequency
        4. 8.2.2.4  Input Capacitors
        5. 8.2.2.5  Inductor Selection
        6. 8.2.2.6  Output Capacitor Selection
        7. 8.2.2.7  Feed-Forward Capacitor
        8. 8.2.2.8  Bootstrap Capacitors
        9. 8.2.2.9  VCC Capacitor
        10. 8.2.2.10 BIAS Capacitors
        11. 8.2.2.11 Soft-Start Capacitors
        12. 8.2.2.12 Undervoltage Lockout Setpoint
        13. 8.2.2.13 PGOOD
      3. 8.2.3 Application Performance Curves
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
      1. 10.1.1 Compact Layout for EMI Reduction
      2. 10.1.2 Ground Plane and Thermal Considerations
      3. 10.1.3 Feedback Resistors
    2. 10.2 Layout Example
  11. 11Device and Documentation Support
    1. 11.1 Device Support
      1. 11.1.1 Third-Party Products Disclaimer
    2. 11.2 Development Support
      1. 11.2.1 Custom Design With WEBENCH® Tools
    3. 11.3 Receiving Notification of Documentation Updates
    4. 11.4 Community Resources
    5. 11.5 Electrostatic Discharge Caution
    6. 11.6 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

4 Revision History

Changes from B Revision (April 2017) to C Revision

  • Added top navigator icon for TI reference design Go
  • Changed MAX value for VBIAS rising threshold from "3.15" to "3.18" V Go

Changes from A Revision (May 2015) to B Revision

  • Added links for Webench Go
  • Added LM43603A Device InformationGo
  • Added Maximum Operating Junction Temperature Go
  • Added standard FN1 to Thermal Information Go
  • Updating the RPGOOD value on EN = 3.3V and EN = 0V Go
  • Updating Figure 11 to match Figure 87 Go
  • Updating EN Falling Threshold CurveGo
  • Updating EN Rising Threshold Curve Go
  • Updating EN Hysteresis Curve Go
  • Changed Figure 33 into conducted EMI CurveGo
  • Replaced last few sentences of Application Information due to new Webench contentGo
  • Added Equation 25Go
  • Added Equation 26Go
  • Added Figure 73 to Figure 78. Application Performance Curves for VOUT = 5 V, Fs = 500 kHz. Go
  • Changed Figure 86Go
  • Changed Figure 87 Go

Changes from * Revision (April 2015) to A Revision

  • Changed device from Product Preview to Production Data Go
  • Deleted "Super-AM Band"Go
  • Added "BIAS pin voltage should never exceed VIN" to BIAS pin descriptionGo
  • Added "of 10000 hours" to Ab Max FN 2Go
  • Changed info in Vfb rows; in ILKG-FB changed value of from FB=1.011 V to 1.015 VGo
  • Changed VFB = 1.011 V to VFB = 1.015 VGo