The LP8552 is a white LED driver with integrated boost converter. It has six 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 with additional 1-3 bit dithering 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.

Automatic PWM dimming at lower brightness values and current dimming at higher brightness values can be used to improve the optical efficiency. 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 LP8552 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 with Four Switching Frequency Options: 156/312/625/1250 kHz
• 2.7-V to 22-V Input Voltage Range to Support 1x…5x cell Li-Ion Batteries
• Programmable PWM Resolution
  • 8 to 13 True Bit (Steady State)
  • Additional 1 to 3 Bits Using Dithering During Brightness Changes
• I2C-Compatible and PWM Brightness Control
• Automatic PWM & Current Dimming for Improved Efficiency
• PWM Output Frequency and LED Current set through Resistors
• Optional Synchronization to Display VSYNC Signal
• 6 LED Outputs with LED Fault (Short/Open) Detection
• Low Input Voltage, Over-temperature, Overcurrent Detection, and Shutdown
• Minimum Number of External Components

• Number of channels (#)
• 6
• Vin (Min) (V)
• 2.7
• 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 (%)
• 93
• Topology
• Boost
• Features
• Adjustable Switch Frequency, Enable/Shutdown, I2C Control, PWM Control
• Operating temperature range (C)
• -40 to 85

LP8552的完整型号有：LP8552TLE-E04/NOPB、LP8552TLE-E06/NOPB、LP8552TLE/NOPB、LP8552TLX-E04/NOPB、LP8552TLX-E06/NOPB、LP8552TLX/NOPB，以下是这些产品的关键参数及官网采购报价：

LP8552TLE-E04/NOPB，工作温度：-40 to 85，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LP8552TLE-E04/NOPB的批量USD价格：.998（1000+）

LP8552TLE-E06/NOPB，工作温度：-40 to 85，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LP8552TLE-E06/NOPB的批量USD价格：.998（1000+）

LP8552TLE/NOPB，工作温度：-40 to 85，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LP8552TLE/NOPB的批量USD价格：.998（1000+）

LP8552TLX-E04/NOPB，工作温度：-40 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LP8552TLX-E04/NOPB的批量USD价格：.832（1000+）

LP8552TLX-E06/NOPB，工作温度：-40 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LP8552TLX-E06/NOPB的批量USD价格：.832（1000+）

LP8552TLX/NOPB，工作温度：-40 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LP8552TLX/NOPB的批量USD价格：.832（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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