Top

Product details

Parameters

Channels (#) 6 Vin (Min) (V) 2.7 Vin (Max) (V) 5.5 Vout (Min) (V) 7 Vout (Max) (V) 28 Switching frequency (Max) (kHz) 1000 Type Inductive LED current per channel (mA) 25 LED (#) 48 Topology Boost Shutdown current (Typ) (uA) 0.001 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

Features

  • 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
open-in-new Find other Backlight LED drivers

Description

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.
open-in-new Find other Backlight LED drivers
Download
Similar products you might be interested in
open-in-new Compare products
Similar but not functionally equivalent to the compared device:
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

= Featured
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
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
Technical articles Solving the automotive EMI issues in new cars with all the screens Sep. 10, 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

EVALUATION BOARDS Download
document-generic User guide
$249.00
Description

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.

Features
  • Includes LED load board
  •  Supports PWM dimming input
  •  Test points for power measurements
  •  Windows 7 evaluation software
  •  Includes USB interface
EVALUATION BOARDS Download
document-generic User guide
$249.00
Description

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 (...)

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

Software development

DRIVERS & LIBRARIES Download
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 git.ti.com: N/A

Supported Devices:

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

CAD/CAE symbols

Package Pins Download
DSBGA (YFQ) 16 View options

Ordering & quality

Support & training

TI E2E™ forums with technical support from TI engineers

Content is provided "as is" by TI and community contributors and does not constitute TI specifications. See terms of use.

If you have questions about quality, packaging or ordering TI products, see TI support. ​​​​​​​​​​​​​​