SLVSH98A July   2023  – November 2023 LP8868U-Q1 , LP8868V-Q1 , LP8868W-Q1 , LP8868X-Q1 , LP8868Y-Q1 , LP8868Z-Q1

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4  Comparison Table
  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 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 Adaptive Off-Time Current Mode Control
        1. 7.3.1.1 Switching Frequency Settings
        2. 7.3.1.2 Spread Spectrum
      2. 7.3.2 Setting LED Current
      3. 7.3.3 Internal Soft Start
      4. 7.3.4 Dimming Mode
        1. 7.3.4.1 PWM dimming
        2. 7.3.4.2 Analog dimming
        3. 7.3.4.3 Hybrid Dimming
        4. 7.3.4.4 Flexible Dimming
      5. 7.3.5 Undervoltage Lockout
      6. 7.3.6 Fault Protection
      7. 7.3.7 Thermal Foldback
  9. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 LP8868XQDMTRQ1 12-V Input, 1-A Output, 8-piece LED With Boost Topology
        1. 8.2.1.1 Design Requirements
        2. 8.2.1.2 Detailed Design Procedure
          1. 8.2.1.2.1 Inductor Selection
          2. 8.2.1.2.2 Input Capacitor Selection
          3. 8.2.1.2.3 Output Capacitor Selection
          4. 8.2.1.2.4 Sense Resistor Selection
          5. 8.2.1.2.5 Other External Components Selection
        3. 8.2.1.3 Application Curves
      2. 8.2.2 LP8868YQDMTRQ1 12-V Input, 1-A Output, 5-piece LED With Buck-Boost Topology
        1. 8.2.2.1 Design Requirements
        2. 8.2.2.2 Detailed Design Procedure
          1. 8.2.2.2.1 Inductor Selection
          2. 8.2.2.2.2 Input Capacitor Selection
          3. 8.2.2.2.3 Output Capacitor Selection
          4. 8.2.2.2.4 Sense Resistor Selection
          5. 8.2.2.2.5 Other External Components Selection
        3. 8.2.2.3 Application Curves
      3. 8.2.3 LP8868ZQDMTRQ1 12-V Input, 2-A Output, 1-piece LED With Buck Topology
        1. 8.2.3.1 Design Requirements
        2. 8.2.3.2 Detailed Design Procedure
          1. 8.2.3.2.1 Inductor Selection
          2. 8.2.3.2.2 Input Capacitor Selection
          3. 8.2.3.2.3 Output Capacitor Selection
          4. 8.2.3.2.4 Sense Resistor Selection
          5. 8.2.3.2.5 Other External Components Selection
        3. 8.2.3.3 Application Curves
    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 Receiving Notification of Documentation Updates
    2. 9.2 Support Resources
    3. 9.3 Trademarks
    4. 9.4 Electrostatic Discharge Caution
    5. 9.5 Glossary
  11. 10Revision History
  12. 11Mechanical, Packaging, and Orderable Information

Package Options

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

8.2.2.3 Application Curves

GUID-20231016-SS0I-TPHZ-H6MB-MLBZTZN4KXMZ-low.svg
Ch 2: SW, Ch 3: Inductor Current, Ch 4: LED Current Ripple (AC)
Figure 8-9 LED Current Ripple at ADIM = 100%, 1 kHz and FSW = 400 kHz
GUID-20231016-SS0I-QVJH-47Q5-RRTQT2NH5RBJ-low.svg
Ch 1: PWM/EN, Ch 2: SW, Ch 3: Inductor Current, Ch 4: LED Current
Figure 8-11 LED Current Transient for a PWM Transition from 10% to 99%, 4 kHz
GUID-20231016-SS0I-QFT1-FR46-TKZKPNNDN78M-low.svg
Ch 1: PWM/EN, Ch 2: SW, Ch 3: Inductor Current, Ch 4: LED Current
Figure 8-13 Shutdown at PWM = 1%, 4kHz
GUID-20231016-SS0I-0ZJS-J43C-35TBMJW21ZDT-low.svg
Ch 1: PWM/EN, Ch 2: SW, Ch 3: Inductor Current, Ch 4: LED Current
Figure 8-10 LED Current Ripple at PWM = 50%, 20 kHz and FSW = 400 kHz
GUID-20231016-SS0I-B91W-KZVM-MQDN9JHG8JZT-low.svg
Ch 1: ADIM, Ch 2: SW, Ch 3: Inductor Current, Ch 4: LED Current
Figure 8-12 Startup at ADIM = 100%, 500Hz
GUID-20231016-SS0I-VPLT-3LRL-ZHPQ8KCX6FK2-low.svg
Ch 1: ADIM, Ch 2: SW, Ch 3: Inductor Current, Ch 4: LED Current
Figure 8-14 Shutdown at ADIM = 100%, 500 Hz