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LP8863-Q1 Automotive Display LED-Backlight Driver With Six 150-mA Channels
- 1 Features
- 2 Applications
- 3 Description
- 4 Revision History
- 5 Device Comparison Table
- 6 Pin Configuration and Functions
-
7 Specifications
- 7.1 Absolute Maximum Ratings
- 7.2 ESD Ratings
- 7.3 Recommended Operating Conditions
- 7.4 Thermal Information
- 7.5 Electrical Characteristics
- 7.6 Protection Electrical Characteristics
- 7.7 LED Current Sink and LED PWM Electrical Characteristics
- 7.8 Power-Line FET and RISENSE Electrical Characteristics
- 7.9 Input PWM Electrical Characteristics
- 7.10 Boost Converter Electrical Characteristics
- 7.11 Oscillator
- 7.12 Charge Pump
- 7.13 Logic Interface Characteristics
- 7.14 Timing Requirements for SPI Interface
- 7.15 Timing Requirements for I2C Interface
- 7.16 Typical Characteristics
-
8 Detailed Description
- 8.1 Overview
- 8.2 Functional Block Diagram
- 8.3 Feature Description
- 8.4 Device Functional Modes
- 8.5 Programming
- 8.6
Register Maps
- 8.6.1
FullMap Registers
- 8.6.1.1 BL_MODE Register (Offset = 20h) [reset = 300h]
- 8.6.1.2 DISP_BRT Register (Offset = 28h) [reset = 0h]
- 8.6.1.3 GROUPING1 Register (Offset = 30h) [reset = 0h]
- 8.6.1.4 GROUPING2 Register (Offset = 32h) [reset = 0h]
- 8.6.1.5 USER_CONFIG1 Register (Offset = 40h) [reset = 8B0h]
- 8.6.1.6 USER_CONFIG2 Register (Offset = 42h) [reset = 0h]
- 8.6.1.7 INTERRUPT_ENABLE_3 Register (Offset = 4Eh) [reset = 200Ah]
- 8.6.1.8 INTERRUPT_ENABLE_1 Register (Offset = 50h) [reset = A02Ah]
- 8.6.1.9 INTERRUPT_ENABLE_2 Register (Offset = 52h) [reset = 80h]
- 8.6.1.10 INTERRUPT_STATUS_1 Register (Offset = 54h) [reset = 0h]
- 8.6.1.11 INTERRUPT_STATUS_2 Register (Offset = 56h) [reset = 0h]
- 8.6.1.12 INTERRUPT_STATUS_3 Register (Offset = 58h) [reset = 0h]
- 8.6.1.13 JUNCTION_TEMPERATURE Register (Offset = E8h) [reset = 100h]
- 8.6.1.14 TEMPERATURE_LIMIT_HIGH Register (Offset = ECh) [reset = 7Dh]
- 8.6.1.15 TEMPERATURE_LIMIT_LOW Register (Offset = EEh) [reset = 69h]
- 8.6.1.16 CLUSTER1_BRT Register (Offset = 13Ch) [reset = FFFFh]
- 8.6.1.17 CLUSTER2_BRT Register (Offset = 148h) [reset = FFFFh]
- 8.6.1.18 CLUSTER3_BRT Register (Offset = 154h) [reset = FFFFh]
- 8.6.1.19 CLUSTER4_BRT Register (Offset = 160h) [reset = FFFFh]
- 8.6.1.20 CLUSTER5_BRT Register (Offset = 16Ch) [reset = FFFFh]
- 8.6.1.21 BRT_DB_CONTROL Register (Offset = 178h) [reset = 0h]
- 8.6.1.22 LED0_CURRENT Register (Offset = 1C2h) [reset = FFFh]
- 8.6.1.23 LED1_CURRENT Register (Offset = 1C4h) [reset = FFFh]
- 8.6.1.24 LED2_CURRENT Register (Offset = 1C6h) [reset = FFFh]
- 8.6.1.25 LED3_CURRENT Register (Offset = 1C8h) [reset = FFFh]
- 8.6.1.26 LED4_CURRENT Register (Offset = 1CAh) [reset = FFFh]
- 8.6.1.27 LED5_CURRENT Register (Offset = 1CCh) [reset = FFFh]
- 8.6.1.28 BOOST_CONTROL Register (Offset = 288h) [reset = 1C0h]
- 8.6.1.29 SHORT_THRESH Register (Offset = 28Ah) [reset = 2882h]
- 8.6.1.30 FSM_DIAGNOSTICS Register (Offset = 2A4h) [reset = 0h]
- 8.6.1.31 PWM_INPUT_DIAGNOSTICS Register (Offset = 2A6h) [reset = 0h]
- 8.6.1.32 PWM_OUTPUT_DIAGNOSTICS Register (Offset = 2A8h) [reset = 0h]
- 8.6.1.33 LED_CURR_DIAGNOSTICS Register (Offset = 2AAh) [reset = 0h]
- 8.6.1.34 ADAPT_BOOST_DIAGNOSTICS Register (Offset = 2ACh) [reset = 0h]
- 8.6.1.35 AUTO_DETECT_DIAGNOSTICS Register (Offset = 2AEh) [reset = 0h]
- 8.6.1
FullMap Registers
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9 Application and Implementation
- 9.1 Application Information
- 9.2
Typical Applications
- 9.2.1
Full Feature Application for Display Backlight
- 9.2.1.1 Design Requirements
- 9.2.1.2
Detailed Design Procedure
- 9.2.1.2.1 Inductor Selection
- 9.2.1.2.2 Output Capacitor Selection
- 9.2.1.2.3 Input Capacitor Selection
- 9.2.1.2.4 Charge Pump Output Capacitor
- 9.2.1.2.5 Charge Pump Flying Capacitor
- 9.2.1.2.6 Output Diode
- 9.2.1.2.7 Switching FET
- 9.2.1.2.8 Boost Sense Resistor
- 9.2.1.2.9 Power-Line FET
- 9.2.1.2.10 Input Current Sense Resistor
- 9.2.1.2.11 Feedback Resistor Divider
- 9.2.1.2.12 Critical Components for Design
- 9.2.1.3 Application Curves
- 9.2.2 Application With Basic/Minimal Operation
- 9.2.3
SEPIC Mode Application
- 9.2.3.1 Design Requirements
- 9.2.3.2
Detailed Design Procedure
- 9.2.3.2.1 Inductor Selection
- 9.2.3.2.2 Coupling Capacitor Selection
- 9.2.3.2.3 Output Capacitor Selection
- 9.2.3.2.4 Input Capacitor Selection
- 9.2.3.2.5 Charge Pump Output Capacitor
- 9.2.3.2.6 Charge Pump Flying Capacitor
- 9.2.3.2.7 Switching FET
- 9.2.3.2.8 Output Diode
- 9.2.3.2.9 Switching Sense Resistor
- 9.2.3.2.10 Power-Line FET
- 9.2.3.2.11 Input Current Sense Resistor
- 9.2.3.2.12 Feedback Resistor Divider
- 9.2.3.2.13 Critical Components for Design
- 9.2.3.3 Application Curves
- 9.2.1
Full Feature Application for Display Backlight
- 10Power Supply Recommendations
- 11Layout
- 12Device and Documentation Support
- 13Mechanical, Packaging, and Orderable Information
- IMPORTANT NOTICE
DATA SHEET
LP8863-Q1 Automotive Display LED-Backlight Driver With Six 150-mA Channels
1 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
2 Applications
- Backlight for:
- Automotive Infotainment
- Automotive Instrument Clusters
- Smart Mirrors
- Heads-Up Displays (HUD)
- Central Information Displays (CID)
- Audio-Video Navigation (AVN)
