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Product details

Parameters

Channels (#) 6 Vin (Min) (V) 2.7 Vin (Max) (V) 20 Switching frequency (Max) (kHz) 1250 Product type Inductive LED current per channel (mA) 50 Shutdown current (Typ) (uA) 0.1 Topology Boost Peak efficiency (%) 95 Features I2C Control Operating temperature range (C) -30 to 85 open-in-new Find other Backlight LED drivers

Package | Pins | Size

DSBGA (YFQ) 20 0 mm² 1.75 x 2.411 WQFN (RTW) 24 16 mm² 4 x 4 open-in-new Find other Backlight LED drivers

Features

  • High-efficiency DC/DC boost converter with integrated 0.19-Ω power MOSFET and three switching frequency options: 312 kHz, 625 kHz, and 1250 kHz
  • 2.7-V to 36-V Boost switch input voltage range supports multi-cell Li-Ion batteries
    (2.7-V to 20-V VDD input range)
  • 7-V to 43-V Boost switch output voltage range supports as few as 3 WLEDs in series per channel and as many as 12
  • Configurable channel count (1 to 6)
  • Up to 50 mA per channel
  • PWM and / or I2C brightness control
  • Phase-shift PWM mode reduces audible noise
  • Adaptive dimming for higher LED drive optical efficiency
  • Programmable edge-rate control and spread spectrum scheme minimize switching noise and improve EMI performance
  • LED fault (short and open) detection, UVLO, TSD, OCP, and OVP (up to 6 threshold options)
  • Available in tiny 20-pin, 0.4-mm pitch DSBGA package and 24-pin, 0.5-mm pitch WQFN package

All trademarks are the property of their respective owners.

open-in-new Find other Backlight LED drivers

Description

The LP8556 device is a white-LED driver featuring an asynchronous boost converter and six high precision current sinks that can be controlled by a PWM signal or an I2C master.

The boost converter uses adaptive output voltage control for setting the optimal LED driver voltages as low as 7 V and as high as 43 V. This feature minimizes the power consumption by adjusting the output voltage to the lowest sufficient level under all conditions. The converter can operate at three switching frequencies: 312 kHz, 625 kHz, and 1250 kHz, which can be set with an external resistor or pre-configured via EPROM. Programmable slew rate control and spread spectrum scheme minimize switching noise and improve EMI performance.

LED current sinks can be set with the PWM dimming resolution of up to 15 bits. Proprietary adaptive dimming mode allows higher system power saving. In addition, phase shifted LED PWM dimming allows reduced audible noise and smaller boost output capacitors.

The LP8556 device has a full set of fault-protection features that ensure robust operation of the device and external components. The set consists of input undervoltage lockout (UVLO), thermal shutdown (TSD), overcurrent protection (OCP), up to 6 levels of overvoltage protection (OVP), LED open and short detection.

The LP8556 device operates over the ambient temperature range of –30°C to +85°C. It is available in space-saving 20-pin DSBGA and 24-pad WQFN packages.

open-in-new Find other Backlight LED drivers
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Technical documentation

= Top documentation for this product selected by TI
No results found. Please clear your search and try again. View all 14
Type Title Date
* Datasheet LP8556 High-Efficiency LED Backlight Driver For Tablets datasheet (Rev. M) Jun. 10, 2020
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 AN-1112 DSBGA Wafer Level Chip Scale Package (Rev. AI) Jun. 14, 2019
Selection guides Power Management Guide 2018 (Rev. R) Jun. 25, 2018
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
Application notes Power Budget for Backlight Drivers Jun. 27, 2013
Application notes Increasing Full-Load Efficiency of a Backlight Driver Jun. 05, 2013
User guides LP8556SQ-EVM User's Guide Sep. 27, 2012
User guides LP8556TM-EVM User Guide Aug. 17, 2012

Design & development

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

Hardware development

EVALUATION BOARDS Download
LP8556SQ-EVM
LP8556SQ-EVM
document-generic User guide
175
Description

The Texas Instruments LP8556SQ-EVM evaluation module (EVM) helps designers evaluate the operation and performance of the LP8556 High-Efficiency LED Backlight Driver. The device features high efficiency boost DC-DC converted and 6 high-precision current sinks that can be controlled by either a PWM (...)

Features
  • 2.7V-36V boost input range (2.7V-20V VDD range)
  • 43V maximum boost output voltage
  • LP8556SQE-E09 High-Efficiency WLED Driver
  • USB2ANY Interface Board for easy device control
  • Configurable array of 72 side emitting white LEDs
  • Evaluation Software
  • Compact, low-profile, external components
EVALUATION BOARDS Download
LP8556TM-EVM
LP8556TM-EVM
document-generic User guide
175
Description

The Texas Instruments LP8556TM-EVM evaluation module (EVM) helps designers evaluate the operation and performance of the LP8556 High-Efficiency LED Backlight Driver. The device features high efficiency boost DC-DC converted and 6 high-precision current sinks that can be controlled by either a PWM (...)

Features
  • 2.7V-36V boost input range (2.7V-20V VDD range)
  • 43V maximum boost output voltage
  • LP8556TME-E05 High-Efficiency WLED Driver with Configurable EPROM Settings
  • USB-I2C Interface Board for easy device control
  • Configurable array of 72 side emitting white LEDs
  • Evaluation Software
  • Compact, low-profile, external (...)

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
  • (...)

Design tools & simulation

SIMULATION TOOLS Download
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 (...)
Features
  • 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
  • (...)

Reference designs

REFERENCE DESIGNS Download
Backlight and LCD Bias Reference Design for 90-Hz Refresh-Rate Virtual/Augmented Reality Displays
TIDA-01635 — This reference design describes the power solution for LCD displays in wearable devices, especially in augmented-reality (AR) and virtual reality (VR) headsets. The high current accuracy backlight driver is achieved by LP8556, which provides high current during small duty cycle synchronized with (...)
document-generic Schematic document-generic User guide

CAD/CAE symbols

Package Pins Download
DSBGA (YFQ) 20 View options
WQFN (RTW) 24 View options

Ordering & quality

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