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背光 LED 驅動器

LP8557

現行

適用平板電腦的高效 LED 背光驅動器

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產品規格表

LP8557

現行
產品規格表 立即訂購

產品詳細資料

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 Duty cycle (max) (%) 100 LED current per channel (mA) 25 Peak efficiency (%) 93 Topology Boost Features CABC, Edge Rate Control Operating temperature range (°C) -30 to 85 Rating Catalog
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 Duty cycle (max) (%) 100 LED current per channel (mA) 25 Peak efficiency (%) 93 Topology Boost Features CABC, Edge Rate Control Operating temperature range (°C) -30 to 85 Rating Catalog
DSBGA (YFQ) 16 3.24 mm² 1.8 x 1.8
  • 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
  • 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.

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.
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LP8556 現行 6 通道高效/高功效 LED 背光驅動器 This product is a six channel high-efficiency/efficacy LED backlight driver for notebook.

技術文件

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類型 標題 日期
* Data sheet LP8557 High-Efficiency LED Backlight Driver For Tablets datasheet (Rev. B) PDF | HTML 2015年 12月 18日
White paper Common LED Functions and LED Driver Design Considerations 2020年 9月 21日
Application note Some Guidelines and Tips for the LED Driver Application 2019年 8月 14日
Application note Inductor Selection in Boost Converters for LCD Backlight Applications 2016年 10月 24日
Application note Schottky Diode Selection in Asynchronous Boost Converters 2016年 9月 6日
User guide LP8557 Evaluation Module 2013年 12月 17日

設計與開發

如需其他條款或必要資源，請按一下下方的任何標題以檢視詳細頁面 (如有)。

開發板

LP8557EVM — 適用於 LP8557 6 通道高效率 LCD 背光驅動器的評估模組

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.

使用指南: PDF
TI.com 無法提供
開發板

LP8557IEVM — 具有 I2C 控制，適用於 LP8557 高效率白光 LED 背光驅動器的評估模組

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 (...)

使用指南: PDF
TI.com 無法提供
驅動程式或資料庫

LP8550SW-LINUX — 適用於 LP8550 的 Linux 驅動程式

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
  • (...)
View Options
開發模組 (EVM) 的 GUI

SNVC125 — LP8557 evaluation program

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產品
背光 LED 驅動器
  • LP8557 — 適用平板電腦的高效 LED 背光驅動器
硬體開發
開發板
  • LP8557IEVM — 具有 I2C 控制，適用於 LP8557 高效率白光 LED 背光驅動器的評估模組
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DSBGA (YFQ) 16 Ultra Librarian
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