LP8557
- High-Efficiency DC-DC Boost Converter With 28-V Integrated Power MOSFET
- 2.7-V to 5.5-V VDD Range for Supporting Single-Cell Li-Ion Battery Applications
- Six 25-mA High-Precision LED Current Sinks
- Adaptive Boost Voltage and LED Current Sink Headroom Controls for Maximum System Efficiency
- LED String Count Auto-Detect for Maximum Design Flexibility
- Smart Phase Shift PWM Mode for Reduced Audible Noise
- PWM Input Duty Cycle Brightness Control, PWM Output Frequency Selectable Independent of Input Frequency
- Hybrid PWM Plus Current Dimming for Higher LED Drive Optical Efficiency
- Switching Frequency, PWM Output Frequency, and LED Current can be set Through Resistors or I2C Interface
- Programmable Boost SW Slew Rate Control and Spread Spectrum Scheme for Reduced Switching Noise and Improved EMI Performance
- UVLO, TSD, BST_OVP, BST_OCP, BST_UV, LED OPEN* and LED Short Fault Coverage
- Minimum Number of External Components
The LP8557 and LP8557I are high-efficiency LED drivers each featuring an integrated DC-DC inductive boost converter and six high-precision current sinks. LP8557 is intended for applications that exclusively use a pulse width modulated (PWM) signal for controlling the brightness while LP8557I is intended for applications that can utilize an I2C master as well.
The boost converter has adaptive output voltage control. This feature minimizes the power consumption by adjusting the voltage to the lowest sufficient level under all conditions.
The adaptive current sink headroom voltage control scales the headroom voltage with the LED current for optimal system efficiency.
The LED string auto-detect function enables use of the same device in systems with 1 to 6 LED strings for the maximum design flexibility.
Proprietary hybrid PWM plus current mode dimming enables additional system power savings. Phase-shift PWM allows reduced audible noise and smaller boost output capacitors.
Flexible CABC support combines brightness level selections based on the PWM input and I2C commands.
For all available packages, see the orderable addendum at the end of the data sheet.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 | LP8557 High-Efficiency LED Backlight Driver For Tablets 数据表 (Rev. B) | PDF | HTML | 2015-12-18 | ||
| 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 | ||||
| 应用手册 | Inductor Selection in Boost Converters for LCD Backlight Applications | 2016-10-24 | ||||
| 应用手册 | Schottky Diode Selection in Asynchronous Boost Converters | 2016-9-6 |
设计与开发
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LP8557EVM — LP8557 六通道高效 LCD 背光驱动器评估模块
LP8557 六通道高效 LCD 背光驱动器评估套件。 LP8557 评估套件只需要一个电源和一个 PWM 源。 上电时，LED 亮度由 PWM 信号的脉冲宽度控制。
LP8557IEVM — LP8557 具有 I2C 控制的高效白光 LED 背光驱动器评估模块
LP8557IEVM 是一款六通道高效 LCD 背光驱动器评估套件，包含一个与 I2C 兼容的程序和 USB2ANY 适配器板，带有迷你 USB 电缆，可以简单地练习器件。 评估软件会监控器件的状态，并可以探索各种配置。
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
- (...)
SNVC125 — LP8557 evaluation program
| 封装 | 引脚 | CAD 符号、封装和 3D 模型 |
|---|---|---|
| DSBGA (YFQ) | 16 | Ultra Librarian |