Product details


Channels (#) 6 Vin (Min) (V) 2.7 Vin (Max) (V) 5.5 Switching frequency (Max) (kHz) 1000 Product type Inductive LED current per channel (mA) 25 Shutdown current (Typ) (uA) 0.001 Topology Boost Peak efficiency (%) 93 Features CABC, Edge Rate Control Operating temperature range (C) -30 to 85 open-in-new Find other Backlight LED drivers

Package | Pins | Size

DSBGA (YFQ) 16 0 mm² 1.65 x 1.916 open-in-new Find other Backlight LED drivers


  • 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
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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 ACTIVE 6 channel high-efficiency/Efficacy LED backlight driver This product is a six channel high-efficiency/efficacy LED backlight driver for notebook.

Technical documentation

= Top documentation for this product selected by TI
No results found. Please clear your search and try again. View all 9
Type Title Date
* Datasheet LP8557 High-Efficiency LED Backlight Driver For Tablets datasheet (Rev. B) Dec. 18, 2015
Technical articles Overcoming challenges for backlight LED drivers in automotive display solutions Jul. 16, 2020
Application notes Some Guidelines and Tips for the LED Driver Application Aug. 14, 2019
Application notes Inductor Selection in Boost Converters for LCD Backlight Applications Oct. 24, 2016
Technical articles Here's how body electronics and lighting technology are changing the driving experience Sep. 26, 2016
Application notes Schottky Diode Selection in Asynchronous Boost Converters Sep. 06, 2016
Technical articles LED brightness adjustment: high-frequency PWM dimming Aug. 26, 2016
Technical articles Take better selfies with innovative LED flashes Nov. 18, 2014
User guides LP8557 Evaluation Module Dec. 17, 2013

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Hardware development

document-generic User guide

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.

  • Includes LED load board
  •  Supports PWM dimming input
  •  Test points for power measurements
  •  Windows 7 evaluation software
  •  Includes USB interface
document-generic User guide

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 (...)

  • Includes LED load board
  • Supports PWM dimming input
  • Test points for power measurements
  • Windows 7 evaluation software
  • Includes USB interface

Software development

Linux Driver for LP8550
LP8550SW-LINUX 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 N/A

Supported Devices:

  • lp8550
  • lp8551
  • lp8552
  • (...)

Design tools & simulation

PSpice® for TI design and simulation tool
PSPICE-FOR-TI — PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
  • Leverages Cadence PSpice Technology
  • Preinstalled library with a suite of digital models to enable worst-case timing analysis
  • Dynamic updates ensure you have access to most current device models
  • Optimized for simulation speed without loss of accuracy
  • Supports simultaneous analysis of multiple products
  • (...)

CAD/CAE symbols

Package Pins Download
DSBGA (YFQ) 16 View options

Ordering & quality

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