SLVS845G March   2009  – August 2014

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 Handling 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
      1. 6.8.1 Efficiency Data of Power Supply
      2. 6.8.2 Output Voltage Dropout
      3. 6.8.3 Quiescent and Standby Current
      4. 6.8.4 Reference Voltages
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1  Input Voltage
      2. 7.3.2  Function Mode
      3. 7.3.3  Output Voltage V(VReg)
      4. 7.3.4  Oscillator Frequency (RT)
      5. 7.3.5  Synchronization (SYNC)
      6. 7.3.6  Enable or Shutdown (EN)
      7. 7.3.7  Reset Delay (Cdly)
      8. 7.3.8  Reset Pin (RST)
      9. 7.3.9  Boost Capacitor (BOOT)
      10. 7.3.10 Soft Start (SS)
      11. 7.3.11 Short-Circuit Protection
      12. 7.3.12 Overcurrent Protection
      13. 7.3.13 Slew Rate Control (Rslew)
      14. 7.3.14 Thermal Shutdown
      15. 7.3.15 Regulation Voltage (VSENSE)
      16. 7.3.16 RESET Threshold (RST_TH)
      17. 7.3.17 Overvoltage Supervisor for V(VReg) (OV_TH)
      18. 7.3.18 Noise Filter on RST_TH and OV_TH Pins
      19. 7.3.19 Output Tolerances Based on Modes of Operation
      20. 7.3.20 Load Regulation and Line Regulation in Hysteretic Mode
      21. 7.3.21 Internal Undervoltage Lockout (UVLO)
      22. 7.3.22 Loop-Control Frequency Compensation
        1. 7.3.22.1 Type III Compensation
      23. 7.3.23 Bode Plot of Converter Gain
    4. 7.4 Device Functional Modes
      1. 7.4.1 Low-Power Mode (LPM)
      2. 7.4.2 Buck-Mode Low-Power-Mode Operation
      3. 7.4.3 External LPM Operation
  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  Selecting the Switching Frequency
        2. 8.2.2.2  Output Inductor Selection (LO)
        3. 8.2.2.3  Output Capacitor (CO)
        4. 8.2.2.4  Flyback Schottky Diode
        5. 8.2.2.5  Input Capacitor, C(I)
        6. 8.2.2.6  Output Voltage and Feedback Resistor Selection
        7. 8.2.2.7  Overvoltage Resistor Selection
        8. 8.2.2.8  Reset-Threshold Resistor Selection
        9. 8.2.2.9  Low-Power Mode Threshold
        10. 8.2.2.10 Undervoltage Threshold for Low-Power Mode and Load-Transient Operation
        11. 8.2.2.11 Soft-Start Capacitor
        12. 8.2.2.12 Bootstrap Capacitor Selection
        13. 8.2.2.13 Guidelines for Compensation Components
        14. 8.2.2.14 Compensation
          1. 8.2.2.14.1 Calculate the Loop Compensation
          2. 8.2.2.14.2 Power Dissipation
      3. 8.2.3 Application Curves
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
      1. 10.1.1 Inductor
      2. 10.1.2 Input Filter Capacitors
      3. 10.1.3 Feedback
      4. 10.1.4 Traces and Ground Plane
    2. 10.2 Layout Example
  11. 11Device and Documentation Support
    1. 11.1 Trademarks
    2. 11.2 Electrostatic Discharge Caution
    3. 11.3 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

12 Mechanical, Packaging, and Orderable Information

The following pages include mechanical, packaging, and orderable information. This information is the most-current data available for the designated devices. This data is subject to change without notice and without revision of this document. For browser-based versions of this data sheet, refer to the left-hand navigation.