ZHCSCK8H May 2014 – April 2025 LP8860-Q1
PRODUCTION DATA
- 1
- 1 特性
- 2 應用
- 3 說明
- Device Comparison Table
- 4 Pin Configuration and Functions
-
5 Specifications
- 5.1 Absolute Maximum Ratings
- 5.2 ESD Ratings
- 5.3 Recommended Operating Conditions
- 5.4 Thermal Information
- 5.5 Electrical Characteristics
- 5.6 Current Sinks Electrical Characteristics
- 5.7 Boost Converter Characteristics
- 5.8 Logic Interface Characteristics
- 5.9 VIN Undervoltage Protection (VIN_UVLO)
- 5.10 VDD Undervoltage Protection (VDD_UVLO)
- 5.11 VIN Overvoltage Protection (VIN_OVP)
- 5.12 VIN Overcurrent Protection (VIN_OCP)
- 5.13 Power-Line FET Control Electrical Characteristics
- 5.14 External Temp Sensor Control Electrical Characteristics
- 5.15 I2C Serial Bus Timing Parameters (SDA, SCLK)
- 5.16 SPI Timing Requirements
- 5.17 Typical Characteristics
-
6 Detailed Description
- 6.1 Overview
- 6.2 Functional Block Diagram
- 6.3 Feature Description
- 6.4 Device Functional Modes
- 6.5 Programming
- 6.6
Register Maps
- 6.6.1
Register Bit Explanations
- 6.6.1.1 Display/Cluster1 Brightness Control MSB
- 6.6.1.2 Display/Cluster1 Brightness Control LSB
- 6.6.1.3 Display/Cluster1 Output Current MSB
- 6.6.1.4 Display/Cluster1 Output Current LSB
- 6.6.1.5 Cluster2 Brightness Control MSB
- 6.6.1.6 Cluster2 Brightness Control LSB
- 6.6.1.7 Cluster2 Output Current
- 6.6.1.8 Cluster3 Brightness Control MSB
- 6.6.1.9 Cluster3 Brightness Control LSB
- 6.6.1.10 Cluster3 Output Current
- 6.6.1.11 Cluster4 Brightness Control MSB
- 6.6.1.12 Cluster4 Brightness Control LSB
- 6.6.1.13 Cluster4 Output Current
- 6.6.1.14 Configuration
- 6.6.1.15 Status
- 6.6.1.16 Fault
- 6.6.1.17 LED Fault
- 6.6.1.18 Fault Clear
- 6.6.1.19 Identification
- 6.6.1.20 Temp MSB
- 6.6.1.21 Temp LSB
- 6.6.1.22 Display LED Current MSB
- 6.6.1.23 Display LED Current LSB
- 6.6.1.24 Display LED PWM MSB
- 6.6.1.25 Display LED PWM LSB
- 6.6.1.26 EEPROM Control
- 6.6.1.27 EEPROM Unlock Code
- 6.6.2
EEPROM Bit Explanations
- 6.6.2.1 EEPROM Register 0
- 6.6.2.2 EEPROM Register 1
- 6.6.2.3 EEPROM Register 2
- 6.6.2.4 EEPROM Register 3
- 6.6.2.5 EEPROM Register 4
- 6.6.2.6 EEPROM Register 5
- 6.6.2.7 EEPROM Register 6
- 6.6.2.8 EEPROM Register 7
- 6.6.2.9 EEPROM Register 8
- 6.6.2.10 EEPROM Register 9
- 6.6.2.11 EEPROM Register 10
- 6.6.2.12 EEPROM Register 11
- 6.6.2.13 EEPROM Register 12
- 6.6.2.14 EEPROM Register 13
- 6.6.2.15 EEPROM Register 14
- 6.6.2.16 EEPROM Register 15
- 6.6.2.17 EEPROM Register 16
- 6.6.2.18 EEPROM Register 17
- 6.6.2.19 EEPROM Register 18
- 6.6.2.20 EEPROM Register 19
- 6.6.2.21 EEPROM Register 20
- 6.6.2.22 EEPROM Register 21
- 6.6.2.23 EEPROM Register 22
- 6.6.2.24 EEPROM Register 23
- 6.6.2.25 EEPROM Register 24
- 6.6.1
Register Bit Explanations
-
7 Application and Implementation
- 7.1 Application Information
- 7.2
Typical Applications
- 7.2.1
Typical Application for Display Backlight
- 7.2.1.1 Design Requirements
- 7.2.1.2
Detailed Design Procedure
- 7.2.1.2.1 Inductor Selection
- 7.2.1.2.2 Output Capacitor Selection
- 7.2.1.2.3 Input Capacitor Selection
- 7.2.1.2.4 Charge Pump Output Capacitor
- 7.2.1.2.5 Charge Pump Flying Capacitor
- 7.2.1.2.6 Diode
- 7.2.1.2.7 Boost Converter Transistor
- 7.2.1.2.8 Boost Sense Resistor
- 7.2.1.2.9 Power Line Transistor
- 7.2.1.2.10 Input Current Sense Resistor
- 7.2.1.2.11 Filter Component Values
- 7.2.1.3 Application Performance Plots
- 7.2.2 Low VDD Voltage and Combined Output Mode Application
- 7.2.3 High Output Voltage Application
- 7.2.4 High Output Current Application
- 7.2.5 Three-Channel Configuration Without Serial Interface
- 7.2.6 Solution With Minimum External Components
- 7.2.1
Typical Application for Display Backlight
- 7.3 Power Supply Recommendations
- 7.4 Layout
- 8 Device and Documentation Support
- 9 Revision History
- 10Mechanical, Packaging, and Orderable Information
6.3.9.2 LED Current Dimming With Internal Temperature Sensor
The LP8860-Q1 can prevent thermal shutdown (TSD) by reducing the average LED strings current based on die temperature.
When die temperature reaches <INT_TEMP_LIM[1:0]> EEPROM bits-defined threshold, the device automatically lowers the brightness (2.25% / °C typical). Depending on brightness control mode either PWM duty cycle or current is used for average current reduction.
Figure 6-22 Thermal De-Rating Function Example With 100% and 50% BrightnessTable 6-15 Thermal De-rating Function Temperature Thresholds
| INT_TEMP_LIM[1:0] | TEMPERATURE |
|---|---|
| 00 | disabled |
| 01 | 90°C |
| 10 | 100°C |
| 11 | 110°C |
Table 6-16 Temperature ADC Output for Different Temperatures
| TEMPERATURE (°C) | DECIMAL OUTPUT VALUE OF TEMP[10:0] REGISTER | |
|---|---|---|
| VDD 3.6 (V) | VDD 5 (V) | |
| –40 | 885 | 891 |
| –35 | 901 | 907 |
| –30 | 916 | 923 |
| –25 | 932 | 939 |
| –20 | 948 | 954 |
| –15 | 964 | 970 |
| -10 | 980 | 986 |
| -5 | 994 | 1002 |
| 0 | 1010 | 1018 |
| 5 | 1026 | 1034 |
| 10 | 1041 | 1050 |
| 15 | 1057 | 1066 |
| 20 | 1073 | 1082 |
| 25 | 1089 | 1098 |
| 30 | 1105 | 1115 |
| 35 | 1121 | 1131 |
| 40 | 1137 | 1147 |
| 45 | 1154 | 1163 |
| 50 | 1170 | 1180 |
| 55 | 1186 | 1196 |
| 60 | 1202 | 1212 |
| 65 | 1219 | 1229 |
| 70 | 1235 | 1245 |
| 75 | 1252 | 1262 |
| 80 | 1268 | 1278 |
| 85 | 1285 | 1293 |
| 90 | 1301 | 1310 |
| 95 | 1318 | 1328 |
| 100 | 1332 | 1343 |
| 105 | 1349 | 1359 |
| 110 | 1365 | 1375 |