SNVSCC4C October   2023  – February 2025 LP5811

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Device Comparison
  6. 5 Pin Configuration and Functions
  7. 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 Typical Characteristics
  8. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Synchronous Boost Converter
        1. 7.3.1.1 Undervoltage Lockout
        2. 7.3.1.2 Enable and Soft Start
        3. 7.3.1.3 Switching Frequency
        4. 7.3.1.4 Current Limit Operation
        5. 7.3.1.5 Boost PWM Mode
        6. 7.3.1.6 Boost PFM Mode
      2. 7.3.2 Analog Dimming
      3. 7.3.3 PWM Dimming
      4. 7.3.4 Autonomous Animation Engine Control
        1. 7.3.4.1 Animation Engine Pattern
        2. 7.3.4.2 Sloper
        3. 7.3.4.3 Animation Engine Unit (AEU)
        4. 7.3.4.4 Animation Pause Unit (APU)
      5. 7.3.5 Protections and Diagnostics
        1. 7.3.5.1 Overvoltage Protection
        2. 7.3.5.2 Output Short-to-Ground Protection
        3. 7.3.5.3 LED Open Detections
        4. 7.3.5.4 LED Short Detections
        5. 7.3.5.5 Thermal Shutdown
    4. 7.4 Device Functional Modes
    5. 7.5 Programming
    6. 7.6 Register Maps
  9. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Application
      2. 8.2.2 Design Parameters
      3. 8.2.3 Detailed Design Procedure
        1. 8.2.3.1 Inductor Selection
        2. 8.2.3.2 Output Capacitor Selection
        3. 8.2.3.3 Input Capacitor Selection
        4. 8.2.3.4 Program Procedure
        5. 8.2.3.5 Programming Example
      4. 8.2.4 Application Performance Plots
    3. 8.3 Power Supply Recommendations
    4. 8.4 Layout
      1. 8.4.1 Layout Guidelines
      2. 8.4.2 Layout Example
  10. 9 Device and Documentation Support
    1. 9.1 Documentation Support
    2. 9.2 Receiving Notification of Documentation Updates
    3. 9.3 Support Resources
    4. 9.4 Trademarks
    5. 9.5 Electrostatic Discharge Caution
    6. 9.6 Glossary
  11. 10Revision History
  12. 11Mechanical, Packaging, and Orderable Information

Package Options

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

8.2.2 Design Parameters

Design Parameters shows the typical design parameters of Figure 8-1.

Table 8-1 Design Parameters
PARAMETER VALUE
Input voltage 3.6V to 4.2V by one Li-on battery cell
Output voltage 4.5V
Inductor 1µH
Output capacitor 22µF
LED count 4
LED maximum average current (red, green, blue, white) 51mA, 40mA, 40mA, 40mA
LED PWM frequency 24kHz