The LP8555 is a high efficiency LED driver with integrated dual DC-DC boost converters. It has 12 high-precision current sinks that can be controlled by a PWM input signal, an I²C master, or both.

Dual-boost configuration of LP8555 shares the load to two inductors and allows thinner overall solution size and better efficiency compared to single-boost solutions. 12 LED strings allows driving high number of LEDs with optimal efficiency since boost conversion ratio can be kept low.

The boost converter has adaptive output voltage control based on the LED current sink headroom voltages. This feature minimizes the power consumption by adjusting the voltage to lowest sufficient level in all conditions.

The LED string auto-detect function enables use of the same device in systems with 2 to 12 LED strings for the maximum design flexibility. Proprietary Hybrid PWM and Current dimming mode 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.

• Dual High-Efficiency DC/DC Boost Converters
• 2.7-V to 20-V VDD Range
• 12 50-mA High-Precision LED Current Sinks With 12-Bit Brightness Control
• Adaptive LED Current Sink Headroom Controls for Maximum System Efficiency
• LED String Count Auto-Detection
• Phase-Shifted PWM Mode for Reduced Audible Noise
• PWM Input Duty-Cycle and/or I2C-Register Brightness Control
• Hybrid PWM and Current Dimming for Higher LED Drive Optical Efficiency
• Flexible CABC Support
• EPROM, I2C-Register, or External Resistors for Configuration
• Improved Boost EMI Performance with Slew-Rate Control, Spread Spectrum, and Phase-Shifted Switching
• Extensive Fault Detection Schemes

• Number of channels (#)
• 12
• Vin (Min) (V)
• 2.7
• Vin (Max) (V)
• 20
• Vout (Min) (V)
• 7
• Vout (Max) (V)
• 28
• Type
• Inductive
• Switching frequency (Max) (kHz)
• 1000
• LED current per channel (mA)
• 50
• Peak efficiency (%)
• 93
• Topology
• Boost
• Features
• Adjustable Switch Frequency, Analog/PWM Mixed Dimming, CABC, Edge Rate Control, I2C Control, Integrated Switch, OVP, PWM Control, Thermal Shutdown
• Operating temperature range (C)
• -40 to 85

LP8555的完整型号有：LP8555YFQR，以下是这些产品的关键参数及官网采购报价：

LP8555YFQR，工作温度：-40 to 85，封装：DSBGA (YFQ)-36，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LP8555YFQR的批量USD价格：1.155（1000+）

LP8555EVM — 高效 LED 背光驱动器评估模块

The Texas Instruments LP8555EVM evaluation module (EVM) helps designers evaluate the operation and performance of this device. The LP8555EVM uses the LP8555 to drive up to 12 LED strings for LCD backlighting with high efficiency. Information about output voltage and current ratings of LP8555EVM can (...)

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
• (...)

LP8555 Evaluation Software

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