LP8551
- High-Voltage DC/DC Boost Converter with Integrated FET;
Four Switching Frequency Options: 156/312/625/1250 kHz - 2.7-V to 22-V Input Voltage Range to Support 1x to 5x Cell
Li-Ion Batteries - 50-mA High-Precision LED Current Sinks
- Adaptive LED Current Sink Headroom Control for Maximum
System Efficiency - Programmable PWM Resolution 8 to 13 Bits
- I2C and PWM Input Duty Cycle Brightness Control
- PWM Output Frequency and LED Current Set Through Resistors
- 4 LED Outputs with LED Fault (short/open) Detection
- Low Input Voltage, Overtemperature, Overcurrent Detection,
and Shutdown - Minimum Number of External Components
The LP8551 is a white LED driver with integrated boost converter. It has four adjustable current sinks which can be controlled by PWM input or with I2C-compatible serial interface.
The boost converter has adaptive output voltage control based on the LED driver voltages. This feature minimizes the power consumption by adjusting the voltage to lowest sufficient level in all conditions.
LED outputs have 8-bit current resolution and up to 13-bit PWM resolution to achieve smooth and precise brightness control. Proprietary Phase Shift PWM control is used for LED outputs to reduce peak current from the boost converter, thus making the boost capacitors smaller. The Phase Shifting scheme also eliminates audible noise.
Internal EEPROM is used for storing the configuration data. This makes it possible to have minimum external component count and make the solution very small.
The LP8551 has safety features which make it possible to detect LED outputs with open or short fault. As well, low input voltage and boost overcurrent conditions are monitored, and chip is turned off in case of these events. Thermal de-rating function prevents overheating of the device by reducing backlight brightness when set temperature has been reached.
技术文档
| 顶层文档 | 类型 | 标题 | 格式选项 | 下载最新的英语版本 | 日期 | |
|---|---|---|---|---|---|---|
| * | 数据表 | LP8551 High-Efficiency LED Backlight Driver for Notebooks 数据表 (Rev. E) | PDF | HTML | 2014-9-2 | ||
| 白皮书 | 常见 LED 功能和 LED 驱动器设计注意事项 | 英语版 | 2020-9-21 | |||
| 应用手册 | Some Guidelines and Tips for the LED Driver Application | 2019-8-14 |
设计与开发
如需其他信息或资源，请点击以下任一标题进入详情页面查看（如有）。
LP8550SW-LINUX — 适用于 LP8550 的 Linux 驱动程序
The Linux driver supports the LP8550/1/2/3/5/6 and LP8557. The Linux driver supports communication through the I2C bus and interfaces with the backlight and PWM sub-system.
Linux Mainline Status
Available in Linux Main line: Yes
Available through git.ti.com: N/A
Supported Devices:
- lp8550
- lp8551
- lp8552
- (...)
| 封装 | 引脚 | CAD 符号、封装和 3D 模型 |
|---|---|---|
| DSBGA (YZR) | 25 | Ultra Librarian |