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.

• 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

• Number of channels (#)
• 6
• Vin (Min) (V)
• 2.7
• Vin (Max) (V)
• 5.5
• Vout (Min) (V)
• 7
• Vout (Max) (V)
• 28
• Type
• Inductive
• Switching frequency (Max) (kHz)
• 1000
• LED current per channel (mA)
• 25
• Peak efficiency (%)
• 93
• Topology
• Boost
• Features
• CABC, Edge Rate Control
• Operating temperature range (C)
• -30 to 85

LP8557的完整型号有：LP8557AYFQR、LP8557AYFQT、LP8557IAYFQR、LP8557IAYFQT，以下是这些产品的关键参数及官网采购报价：

LP8557AYFQR，工作温度：-30 to 85，封装：DSBGA (YFQ)-16，包装数量MPQ：3000个，MSL 等级/回流焊峰值温度：Level-1-260C-UNLIM，引脚镀层/焊球材料：SNAGCU，TI官网LP8557AYFQR的批量USD价格：.739（1000+）

LP8557AYFQT，工作温度：-30 to 85，封装：DSBGA (YFQ)-16，包装数量MPQ：250个，MSL 等级/回流焊峰值温度：Level-1-260C-UNLIM，引脚镀层/焊球材料：SNAGCU，TI官网LP8557AYFQT的批量USD价格：.887（1000+）

LP8557IAYFQR，工作温度：-30 to 85，封装：DSBGA (YFQ)-16，包装数量MPQ：3000个，MSL 等级/回流焊峰值温度：Level-1-260C-UNLIM，引脚镀层/焊球材料：SNAGCU，TI官网LP8557IAYFQR的批量USD价格：.739（1000+）

LP8557IAYFQT，工作温度：-30 to 85，封装：DSBGA (YFQ)-16，包装数量MPQ：250个，MSL 等级/回流焊峰值温度：Level-1-260C-UNLIM，引脚镀层/焊球材料：SNAGCU，TI官网LP8557IAYFQT的批量USD价格：.887（1000+）

LP8557EVM — 用于 LP8557 6 通道高效率 LED 背光驱动器的评估模块

LP8557 6-channel high efficiency LCD backlight driver evaluation kit. The LP8557 evaluation kit only requires a power source and a PWM source. When powered on, the LED brightness is controlled by the pulse width of the PWM signal.

LP8557IEVM — 用于具有 I2C 控制的 LP8557 高效率白光 LED 背光驱动器的评估模块

LP8557IEVM is a 6-channel high efficiency LCD backlight driver evaluation kit that includes an I2C compatible program and USB2ANY adapter board with mini USB cable that exercises the part in a simple way. The status of the device is monitored by the evaluation software and the various (...)

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
• (...)

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在?PSpice for TI 设计和仿真工具中，您可以搜索 TI (...)