SNVSAB6A March 2017  – June 2017 LP8863-Q1

PRODUCTION DATA. 

  1. Features
  2. Applications
  3. Description
  4. Revision History
  5. Device Comparison Table
  6. Pin Configuration and Functions
  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 Protection Electrical Characteristics
    7. 7.7 LED Current Sink and LED PWM Electrical Characteristics
    8. 7.8 Power-Line FET and RISENSE Electrical Characteristics
    9. 7.9 Input PWM Electrical Characteristics
    10. 7.10Boost Converter Electrical Characteristics
    11. 7.11Oscillator
    12. 7.12Charge Pump
    13. 7.13Logic Interface Characteristics
    14. 7.14Timing Requirements for SPI Interface
    15. 7.15Timing Requirements for I2C Interface
    16. 7.16Typical Characteristics
  8. Detailed Description
    1. 8.1Overview
    2. 8.2Functional Block Diagram
    3. 8.3Feature Description
      1. 8.3.1Control Interface
      2. 8.3.2Boost Controller
        1. 8.3.2.1Boost Adaptive Voltage Control
          1. 8.3.2.1.1FB Divider Using Two-Resistor Method
          2. 8.3.2.1.2FB Divider Using Three-Resistor Method
        2. 8.3.2.2Boost Sync and Spread Spectrum
        3. 8.3.2.3Boost Output Discharge
      3. 8.3.32X Charge Pump
      4. 8.3.41.8-V LDO
      5. 8.3.5LED Current Sinks
        1. 8.3.5.1LED Output Current Setting
        2. 8.3.5.2 LED Output PWM Clock Generation
        3. 8.3.5.3LED Output String Configuration
          1. 8.3.5.3.1Independent Cluster Brightness Control Mode
      6. 8.3.6Brightness Control
        1. 8.3.6.1Brightness Control Signal Path
        2. 8.3.6.2Hybrid Dimming
        3. 8.3.6.3Sloper
        4. 8.3.6.4Dither
      7. 8.3.7Die Temperature Read-Out and Thermal Window Detector
      8. 8.3.8Protection and Fault Detections
        1. 8.3.8.1LED Faults
        2. 8.3.8.2Boost Faults
        3. 8.3.8.3Power-Line Faults
        4. 8.3.8.4VDD Undervoltage Fault
        5. 8.3.8.5Thermal Shutdown
        6. 8.3.8.6Overview of the Fault/Protection Schemes
    4. 8.4Device Functional Modes
      1. 8.4.1 State Diagram
      2. 8.4.2 Shutdown
      3. 8.4.3 Device Initialization
      4. 8.4.4 Standby Mode
      5. 8.4.5 Power-line FET Soft Start
      6. 8.4.6 Boost Start-Up
      7. 8.4.7 Normal Mode
      8. 8.4.8 Discharge Mode
      9. 8.4.9 Fault Recovery
      10. 8.4.10Latch Fault
      11. 8.4.11Start-Up Sequence
      12. 8.4.12Shutdown Sequence
    5. 8.5Programming
      1. 8.5.1Serial Interface Selection
      2. 8.5.2SPI Interface
      3. 8.5.3I2C-Compatible Interface
      4. 8.5.4Programming Examples
        1. 8.5.4.1General Configuration Registers
        2. 8.5.4.2Clearing Fault Interrupts
        3. 8.5.4.3Disabling Fault Interrupts
        4. 8.5.4.4Diagnostic Registers
        5. 8.5.4.5Cluster Mode Configuration and Control Registers
    6. 8.6Register Maps
      1. 8.6.1FULLMAP Registers
        1. 8.6.1.1 BL_MODE Register (Offset = 20h) [reset = 300h]
        2. 8.6.1.2 DISP_BRT Register (Offset = 28h) [reset = 0h]
        3. 8.6.1.3 GROUPING1 Register (Offset = 30h) [reset = 0h]
        4. 8.6.1.4 GROUPING2 Register (Offset = 32h) [reset = 0h]
        5. 8.6.1.5 USER_CONFIG1 Register (Offset = 40h) [reset = B0h]
        6. 8.6.1.6 USER_CONFIG2 Register (Offset = 42h) [reset = 0h]
        7. 8.6.1.7 INTERRUPT_ENABLE_3 Register (Offset = 4Eh) [reset = 200Ah]
        8. 8.6.1.8 INTERRUPT_ENABLE_1 Register (Offset = 50h) [reset = A02Ah]
        9. 8.6.1.9 INTERRUPT_ENABLE_2 Register (Offset = 52h) [reset = 80h]
        10. 8.6.1.10INTERRUPT_STATUS_1 Register (Offset = 54h) [reset = 0h]
        11. 8.6.1.11INTERRUPT_STATUS_2 Register (Offset = 56h) [reset = 0h]
        12. 8.6.1.12INTERRUPT_STATUS_3 Register (Offset = 58h) [reset = 0h]
        13. 8.6.1.13JUNCTION_TEMPERATURE Register (Offset = E8h) [reset = 0h]
        14. 8.6.1.14TEMPERATURE_LIMIT_HIGH Register (Offset = ECh) [reset = 7Dh]
        15. 8.6.1.15TEMPERATURE_LIMIT_LOW Register (Offset = EEh) [reset = 69h]
        16. 8.6.1.16CLUSTER1_BRT Register (Offset = 13Ch) [reset = FFFFh]
        17. 8.6.1.17CLUSTER2_BRT Register (Offset = 148h) [reset = FFFFh]
        18. 8.6.1.18CLUSTER3_BRT Register (Offset = 154h) [reset = FFFFh]
        19. 8.6.1.19CLUSTER4_BRT Register (Offset = 160h) [reset = FFFFh]
        20. 8.6.1.20CLUSTER5_BRT Register (Offset = 16Ch) [reset = FFFFh]
        21. 8.6.1.21BRT_DB_CONTROL Register (Offset = 178h) [reset = 0h]
        22. 8.6.1.22LED0_CURRENT Register (Offset = 1C2h) [reset = FFFh]
        23. 8.6.1.23LED1_CURRENT Register (Offset = 1C4h) [reset = FFFh]
        24. 8.6.1.24LED2_CURRENT Register (Offset = 1C6h) [reset = FFFh]
        25. 8.6.1.25LED3_CURRENT Register (Offset = 1C8h) [reset = FFFh]
        26. 8.6.1.26LED4_CURRENT Register (Offset = 1CAh) [reset = FFFh]
        27. 8.6.1.27LED5_CURRENT Register (Offset = 1CCh) [reset = FFFh]
        28. 8.6.1.28BOOST_CONTROL Register (Offset = 288h) [reset = 0h]
        29. 8.6.1.29SHORT_THRESH Register (Offset = 28Ah) [reset = 882h]
        30. 8.6.1.30FSM_DIAGNOSTICS Register (Offset = 2A4h) [reset = 0h]
        31. 8.6.1.31PWM_INPUT_DIAGNOSTICS Register (Offset = 2A6h) [reset = 0h]
        32. 8.6.1.32PWM_OUTPUT_DIAGNOSTICS Register (Offset = 2A8h) [reset = 0h]
        33. 8.6.1.33LED_CURR_DIAGNOSTICS Register (Offset = 2AAh) [reset = 0h]
        34. 8.6.1.34ADAPT_BOOST_DIAGNOSTICS Register (Offset = 2ACh) [reset = 0h]
        35. 8.6.1.35AUTO_DETECT_DIAGNOSTICS Register (Offset = 2AEh) [reset = 0h]
  9. Application and Implementation
    1. 9.1Application Information
    2. 9.2Typical Applications
      1. 9.2.1Full Feature Application for Display Backlight
        1. 9.2.1.1Design Requirements
        2. 9.2.1.2Detailed Design Procedure
          1. 9.2.1.2.1 Inductor Selection
          2. 9.2.1.2.2 Output Capacitor Selection
          3. 9.2.1.2.3 Input Capacitor Selection
          4. 9.2.1.2.4 Charge Pump Output Capacitor
          5. 9.2.1.2.5 Charge Pump Flying Capacitor
          6. 9.2.1.2.6 Output Diode
          7. 9.2.1.2.7 Switching FET
          8. 9.2.1.2.8 Boost Sense Resistor
          9. 9.2.1.2.9 Power-Line FET
          10. 9.2.1.2.10Input Current Sense Resistor
          11. 9.2.1.2.11Feedback Resistor Divider
          12. 9.2.1.2.12Critical Components for Design
        3. 9.2.1.3Application Curves
      2. 9.2.2Application With Basic/Minimal Operation
        1. 9.2.2.1Design Requirements
        2. 9.2.2.2Detailed Design Procedure
        3. 9.2.2.3Application Curves
      3. 9.2.3SEPIC Mode Application
        1. 9.2.3.1Design Requirements
        2. 9.2.3.2Detailed Design Procedure
          1. 9.2.3.2.1 Inductor Selection
          2. 9.2.3.2.2 Coupling Capacitor Selection
          3. 9.2.3.2.3 Output Capacitor Selection
          4. 9.2.3.2.4 Input Capacitor Selection
          5. 9.2.3.2.5 Charge Pump Output Capacitor
          6. 9.2.3.2.6 Charge Pump Flying Capacitor
          7. 9.2.3.2.7 Switching FET
          8. 9.2.3.2.8 Output Diode
          9. 9.2.3.2.9 Switching Sense Resistor
          10. 9.2.3.2.10Power-Line FET
          11. 9.2.3.2.11Input Current Sense Resistor
          12. 9.2.3.2.12Feedback Resistor Divider
          13. 9.2.3.2.13Critical Components for Design
        3. 9.2.3.3Application Curves
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1Layout Guidelines
    2. 11.2Layout Example
  12. 12Device and Documentation Support
    1. 12.1Device Support
      1. 12.1.1Third-Party Products Disclaimer
    2. 12.2Receiving Notification of Documentation Updates
    3. 12.3Community Resources
    4. 12.4Trademarks
    5. 12.5Electrostatic Discharge Caution
    6. 12.6Glossary
  13. 13Mechanical, Packaging, and Orderable Information

Features

  • Qualified for Automotive Applications
  • AEC-Q100 Qualified With the Following Results:
    • Device Temperature Grade 1: –40°C to +125°C Ambient Operating Temperature
  • Input Voltage Operating Range 3 V to 48 V
  • Six High-Precision Current Sinks
    • Current Matching 1% (typical)
    • Dimming Ratio 32 000:1 Using 152-Hz LED Output PWM Frequency
    • Up to 16-bit LED Dimming Resolution With SPI, I2C, or PWM Input
    • Automatically Detects Used LED Strings and Adjusts LED-Channel Phase Shift
    • Independent Current Control for Each Channel
  • Hybrid PWM and Current Dimming Function
  • Up to 47-V VOUT Boost or SEPIC DC-DC Controller
    • Switching Frequency 300 kHz to 2.2 MHz
    • Boost Spread Spectrum for Reduced EMI
    • Boost Sync Input to Set Boost Switching Frequency From an External Clock
    • Integrated Charge Pump Supports Low VIN Conditions Such as Cold Crank
    • Output Voltage Automatically Discharged When Boost is Disabled
  • Extensive Fault Diagnostics
  • Simplified Schematic

    LP8863-Q1 simpschem_snvsab6.gif

Applications

  • Backlight for:
    • Automotive Infotainment
    • Automotive Instrument Clusters
    • Smart Mirrors
    • Heads-Up Displays (HUD)
    • Central Information Displays (CID)
    • Audio-Video Navigation (AVN)

Description

The LP8863-Q1 is an automotive high-efficiency LED driver with boost controller. The six high-precision current sinks support phase shifting that is automatically adjusted based on the number of channels in use. Current sink brightness can be controlled individually and globally through the SPI or I2C interface; brightness can also be globally controlled with PWM input.

The boost controller has adaptive output voltage control based on the headroom voltages of the LED current sinks. This feature minimizes the power consumption by adjusting the voltage to the lowest sufficient level in all conditions. A wide-range adjustable frequency allows the LP8863-Q1 to avoid disturbance for AM radio band.

The LP8863-Q1 supports built-in hybrid PWM and current dimming, which reduces EMI, extends the LED lifetime, and increases the total optical efficiency.

Device Information(1)

PART NUMBERPACKAGEBODY SIZE (NOM)
LP8863-Q1HTSSOP (38)9.70 mm × 4.40 mm
  1. For all available packages, see the orderable addendum at the end of the data sheet.

System Efficiency

LP8863-Q1 D007_page1.gif

Revision History

Changes from * Revision (March 2017) to A Revision

  • First public release of full data sheet Go