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.

• 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

• Number of channels (#)
• 4
• Vin (Min) (V)
• 5.5
• Vin (Max) (V)
• 22
• Vout (Min) (V)
• 10
• Vout (Max) (V)
• 40
• Type
• Inductive
• Switching frequency (Max) (kHz)
• 1250
• LED current per channel (mA)
• 50
• Peak efficiency (%)
• 91
• Topology
• Boost
• Features
• I2C Control
• Operating temperature range (C)
• -30 to 85

LP8551的完整型号有：LP8551TLE/NOPB、LP8551TLX/NOPB，以下是这些产品的关键参数及官网采购报价：

LP8551TLE/NOPB，工作温度：PropertyValue，封装：DSBGA (YZR)-25，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LP8551TLE/NOPB的批量USD价格：.887（1000+）

LP8551TLX/NOPB，工作温度：-30 to 85，封装：DSBGA (YZR)-25，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LP8551TLX/NOPB的批量USD价格：.739（1000+）

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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