SNVSC74 September   2023 LP5813

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Revision History
  6. 5 Device Comparison
  7. 6 Pin Configuration and Functions
  8. 7 Specifications
    1. 7.1 Absolute Maximum Ratings
    2. 7.2 ESD Ratings
    3. 7.3 Recommended Operating Conditions
    4. 7.4 Thermal Information
    5. 7.5 Electrical Characteristics
    6. 7.6 Timing Requirements
  9. 8 Typical Characteristics
  10. 9 Detailed Description
    1. 9.1 Overview
    2. 9.2 Functional Block Diagram
    3. 9.3 Feature Description
      1. 9.3.1 Synchronous Boost Converter
        1. 9.3.1.1 Undervoltage Lockout
        2. 9.3.1.2 Enable and Soft Start
        3. 9.3.1.3 Switching Frequency
        4. 9.3.1.4 Current Limit Operation
        5. 9.3.1.5 Boost PWM Mode
        6. 9.3.1.6 Boost PFM Mode
        7. 9.3.1.7 Pass-Through Mode
      2. 9.3.2 Time-cross-multiplexing (TCM) scheme
        1. 9.3.2.1 Direct drive mode
        2. 9.3.2.2 TCM drive mode
        3. 9.3.2.3 Mix drive mode
        4. 9.3.2.4 Ghosting elimination
      3. 9.3.3 Analog Dimming
      4. 9.3.4 PWM Dimming
      5. 9.3.5 Autonomous Animation Engine Control
        1. 9.3.5.1 Animation Engine Pattern
        2. 9.3.5.2 Sloper
        3. 9.3.5.3 Animation Engine Unit (AEU)
        4. 9.3.5.4 Animation Pause Unit (APU)
      6. 9.3.6 Protections and Diagnostics
        1. 9.3.6.1 Overvoltage Protection
        2. 9.3.6.2 Output Short-to-Ground Protection
        3. 9.3.6.3 LED Open Detections
        4. 9.3.6.4 LED Short Detections
        5. 9.3.6.5 Thermal Shutdown
    4. 9.4 Device Functional Modes
    5. 9.5 Programming
    6. 9.6 Register Map Table
  11. 10Application and Implementation
    1. 10.1 Application Information
    2. 10.2 Typical Application
      1. 10.2.1 Application
      2. 10.2.2 Design Parameters
      3. 10.2.3 Detailed Design Procedure
        1. 10.2.3.1 Inductor Selection
        2. 10.2.3.2 Output Capacitor Selection
        3. 10.2.3.3 Input Capacitor Selection
        4. 10.2.3.4 Program Procedure
        5. 10.2.3.5 Programming Example
      4. 10.2.4 Application Performance Plots
    3. 10.3 Power Supply Recommendations
    4. 10.4 Layout
      1. 10.4.1 Layout Guidelines
      2. 10.4.2 Layout Example
  12. 11Device and Documentation Support
    1. 11.1 Documentation Support
    2. 11.2 Receiving Notification of Documentation Updates
    3. 11.3 Support Resources
    4. 11.4 Trademarks
    5. 11.5 Electrostatic Discharge Caution
    6. 11.6 Glossary
  13. 12Mechanical, Packaging, and Orderable Information

Package Options

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

9.3.1.7 Pass-Through Mode

When the input voltage is higher than the setting output voltage, the output voltage is higher than the target regulation voltage. When the output voltage is 101% of the setting target voltage, the LP5813 stops switching and fully turns on the high-side FET and works in pass-through mode. The output voltage is the input voltage minus the voltage drop across the DCR of the inductor and the RDS(on) of the high-side FET. When the output voltage drops below the 97% of the setting target voltage as the input voltage declines or the load current increases, the LP5813 resumes switching again to regulate the output voltage.