L8556E9

High-efficiency 6-channel LED backlight driver, boost DC/DC, I2C/PWM dimming

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Manufacturer Part：

L8556E9

Package：

DSBGA (20-pin) / WQFN (24-pin, 4x4mm)

Brand：
Product Categories：
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Service & Packaging
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Description

Product Overview

The LP8556 (L8556E9) is a high-efficiency LED backlight driver from Texas Instruments, designed for tablet and notebook LCD displays. This device integrates a high-efficiency DC/DC boost converter with integrated power MOSFET and six LED current sinks, providing a complete LED backlight solution. The boost converter operates from 2.7V to 20V input and can generate output voltages up to 43V to drive multiple LEDs in series per string. With six channels supporting up to 50mA per channel, the LP8556 provides flexible current matching and dimming control via PWM or I²C interface. Advanced features include adaptive dimming, phase-shift PWM for reduced audible noise, programmable edge rate control, and spread spectrum for reduced EMI. The device is available in space-saving packages including DSBGA and WQFN.

Key Specifications

Manufacturer Texas Instruments
Product Type LED Backlight Driver (Boost + 6 Channels)
Topology Boost DC/DC + Current Sinks
Input Voltage (Boost) 2.7 V to 36 V
Input Voltage (VDD) 2.7 V to 20 V
Output Voltage Range 7 V to 43 V (boost output)
Number of LED Channels 6 (configurable: 1 to 6 channels)
LED Current per Channel Up to 50 mA
Switching Frequency 312 kHz / 625 kHz / 1250 kHz (selectable)
Peak Efficiency Up to 95%
Power MOSFET Integrated 0.19Ω power MOSFET
Dimming Control PWM dimming + I²C control
Dimming Frequency Programmable via I²C
Protection Features UVLO, OVP, OCP, LED fault, TSD
Operating Temperature -30°C to +85°C
Package Options DSBGA (20-pin), WQFN (24-pin)
Status Active / Mature

Features

  • High-efficiency DC/DC boost converter with integrated 0.19Ω MOSFET
  • Three switching frequency options: 312kHz, 625kHz, 1250kHz
  • Wide input voltage range: 2.7V to 20V (VDD), 2.7V to 36V (boost)
  • Up to 43V boost output voltage
  • 6 LED current sinks, up to 50mA per channel
  • Configurable channel count (1 to 6 channels)
  • PWM and/or I²C brightness control
  • Phase-shift PWM mode reduces audible noise
  • Adaptive dimming improves LED drive efficiency
  • Programmable edge rate control and spread spectrum for low EMI
  • Comprehensive fault protection: LED short/open, UVLO, TSD, OCP, OVP

Applications

  • Tablet PC LCD LED backlighting
  • Notebook and netbook display backlights
  • Portable media player displays
  • Industrial display panels
  • Automotive display backlighting
  • High-brightness LED drivers
  • General purpose LED lighting with boost topology

The LP8556 (referred to as L8556E9) is a high-efficiency LED backlight driver from Texas Instruments, designed specifically for tablet and notebook LCD display backlighting applications. This device integrates a high-efficiency current-mode DC/DC boost converter with integrated 0.19Ω power MOSFET and six LED current sinks, providing a complete LED driver solution in a single chip. The boost converter accepts input voltages from 2.7V to 20V (VDD) and 2.7V to 36V (boost input), and can generate output voltages up to 43V to drive multiple white LEDs in series per string. Six current sink channels, each capable of up to 50mA, provide precise current regulation for uniform LED brightness. The number of active channels is configurable from 1 to 6, allowing optimization for different LED string configurations. Brightness control is available through both PWM dimming and I²C interface, with phase-shift PWM technology to reduce audible noise from ceramic capacitors. Adaptive dimming technology automatically adjusts the boost output voltage based on LED forward voltage, maximizing efficiency. Advanced features include programmable switching frequency (312kHz/625kHz/1.25MHz), spread spectrum modulation, and programmable edge rate control for reducing electromagnetic interference (EMI). Comprehensive fault protection includes LED open and short detection, over-voltage protection (OVP), over-current protection (OCP), thermal shutdown (TSD), and under-voltage lockout (UVLO). Available in compact DSBGA and WQFN packages, the LP8556 is ideal for space-constrained portable display applications.

The LP8556/L8556E9 operates as a boost LED driver with integrated current sinks and digital control. Its architecture includes: 1) Boost DC/DC Converter: A current-mode boost converter with integrated 0.19Ω power MOSFET steps up the input voltage to the required LED string voltage. The converter uses a current-mode control architecture with external compensation for stability. Switching frequency is programmable at 312kHz, 625kHz, or 1.25MHz via configuration pins or I²C. The adaptive boost output voltage automatically adjusts to the minimum voltage needed for the LED strings, optimizing efficiency. 2) LED Current Sinks: Six precision current sinks regulate the current through each LED string, ensuring uniform brightness across all LEDs. Each sink can handle up to 50mA of LED current. The current is set via external resistor or I²C register. The current sinks feature excellent current matching across channels, ensuring uniform backlight brightness. 3) Dimming Control: Brightness control is achieved through PWM dimming, where the LED current is pulsed on and off at a frequency above the human flicker threshold. Phase-shift PWM technology staggers the turn-on/off times of different channels to reduce peak current draw and audible noise from ceramic capacitors. I²C interface allows programming of brightness levels, dimming frequency, and other parameters. 4) Protection and Monitoring: Comprehensive fault protection ensures reliable operation. LED open-circuit detection identifies broken LED strings. LED short-circuit detection protects against shorted LEDs. Over-voltage protection prevents excessive output voltage. Over-current protection limits inductor and switch current. Thermal shutdown protects the device from overheating. Under-voltage lockout ensures proper operation above minimum supply voltage.

Pin Name Type Function Description
VDD Power Digital supply voltage (2.7V to 20V)
VIN Power Boost converter input voltage (2.7V to 36V)
SW Switch Boost switch node (connect to inductor and Schottky diode)
VOUT Output Boost output voltage sense / LED supply
GND Ground Ground connection
LED1 – LED6 Current Sink LED current sink outputs (6 channels)
FB Feedback Boost output voltage feedback
PWM Input PWM dimming control input
SCL/SDA I2C I²C serial clock and data
EN Input Chip enable input
FSET Config Switching frequency setting
RSET Config LED full-scale current setting resistor
FAULT Output Fault indicator output (open-drain)
COMP Analog Compensation network for boost controller
  • Tablet computer LCD display LED backlight drivers
  • Notebook and netbook screen backlight power supplies
  • Portable media player and e-reader display lighting
  • Industrial control panel and HMI display backlights
  • Automotive infotainment and instrument cluster displays
  • High-brightness LED lighting with boost topology
  • Medical equipment display backlighting
Manufacturer Part Number Channels Notes
Texas Instruments LP8556SQE-E09 6 24-pin WQFN package variant
Texas Instruments LP8555 8 8-channel version, boost + buck
Texas Instruments LP8580 8 Newer generation, MIPI-DSI interface
Maxim MAX17107 8 8-string boost LED driver
ON Semiconductor NCP3065 1 Single-channel boost LED driver
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Quality Assurance

Quality is the core foundation of our long-term global cooperation. With over 20 years of experience in the electronic component industry, Materialparts has built a strict and standardized quality management system covering component sourcing, incoming inspection, full-batch testing, packaging and delivery. We are committed to delivering 100% genuine, high-reliability electronic components for industrial control, automotive electronics, consumer electronics and medical device industries, and fully safeguarding your production and R&D projects.

1. Authorized & Genuine Sourcing Promise

All of our electronic components are procured from official authorized distributors and original manufacturers. We strictly reject counterfeits, refurbished parts, disassembled components and gray-market goods. Every product is guaranteed to be brand-new original parts and fully consistent with the original technical parameters. For branded products such as NXP IC series, we maintain complete supply channel documents to realize full product traceability.

2. Strict Full-batch Quality Inspection

We implement 100% full-batch quality control for all goods before shipment. Our professional QC team conducts multi-dimensional tests including appearance inspection, electrical parameter testing, performance verification and packaging check. Each batch of components is attached with complete inspection reports and batch records. We stick to zero-tolerance standards for defective products to ensure every piece of component meets industrial application requirements.

3. Industry Standard Compliance

Our products comply with a variety of international industry quality standards to adapt to high-standard application scenarios:
  • Automotive Electronics: All automotive-grade components pass AEC-Q series certification, featuring excellent stability and durability to adapt to complex vehicle operating environments.
  • Medical Devices: High-reliability components meet medical industry safety and compliance regulations, ensuring stable operation for medical equipment.
  • Industrial Control & Consumer Electronics: Products conform to universal international electronic industry standards, suitable for long-term continuous operation of various equipment.

4. Professional Reliability Control

For static-sensitive, moisture-sensitive and precision components such as ICs, PCBs, sensors and connectors, we carry out reliability screening in advance. Combined with standardized ESD anti-static packaging and vacuum moisture-proof packaging, we avoid component damage caused by static electricity, dampness or collision during storage and transportation, and retain the original performance of products.

5. Traceability Management System

We establish a complete product traceability system. Each batch of goods corresponds to independent batch number, sourcing record, inspection record and delivery record. Customers can query the whole lifecycle information of components at any time. This system effectively solves quality risks and facilitates after-sales handling and production quality control for your company.

6. After-sales Quality Guarantee

If any product is confirmed to have non-conformity quality problems due to our reasons after receipt, we provide free return, exchange and supplementary delivery services. Our professional quality team will also conduct root cause analysis to optimize our quality control process. We respond to quality feedback within 24 hours to resolve your worries efficiently.

Contact Us

If you have inquiries about our quality standards, inspection procedures or product certification documents, please feel free to contact us:

 

Email: info@ic-vendor.com
Tel / WhatsApp: +86 13760382860
Address: Room 2919, Guoli Building, Huaqiang North, Futian District, Shenzhen, Guangdong, China

 

Shipping & Payment

Materialparts is a professional global supplier of electronic components with over 20 years of industry experience. We provide one-stop supply of passive components, integrated circuits, as well as parts for industrial control, automotive electronics, consumer electronics and medical devices. Below are the unified shipping and payment policies applicable to all orders, samples and bulk purchases worldwide.

1. Payment Terms

We offer a variety of secure and convenient payment methods to meet diverse business cooperation needs. Details are as follows:
  1. Accepted Payment Methods
  • T/T (Bank Wire Transfer): The primary settlement method for bulk orders and a widely used international payment channel.
  • PayPal: Ideal for small orders, sample orders and quick payments.

  1. Settlement Currency

     

    US Dollar (USD) is the default settlement currency. RMB is available for domestic customers.

  2. Bank Charges

     

    All transfer fees, intermediary bank charges and other remittance-related expenses shall be borne by the buyer.

  3. Payment Requirements
  • Sample and small orders: Shipment will be arranged upon full payment.
  • In-stock bulk orders: Goods will be delivered within 2 to 3 working days after full payment.

2. Shipping & Delivery

We partner with leading global logistics providers to ensure safe and fast delivery worldwide. Relevant details are listed below:
  1. Logistics Partners
  • International Express: DHL, FedEx, UPS, TNT
  • Economy Logistics: Air freight and sea freight for large-volume cargo
  • Domestic Delivery: SF Express, Yunda Express
  1. Order Processing Time
  • In-stock items: Orders confirmed and fully paid before 14:00 (GMT+8) will be shipped on the same day. All other orders will be dispatched within 1 to 2 working days.
  • Out-of-stock or sourced items: The delivery lead time will be confirmed separately according to brand and inventory status.
  1. Estimated Transit Time
  • International Express: 3 – 7 working days globally
  • Air Freight: 7 – 12 working days
  • Sea Freight: 25 – 40 working days for heavy and large bulk cargo
  1. Shipping Fee Rules
  • Shipping cost is calculated based on package weight, volume, destination and delivery method.
  • Both freight prepaid and freight collect are available. Please provide your courier account number in advance if you choose freight collect.
  • Free international express delivery is offered for large orders. Terms for long-term partners can be negotiated separately.
  1. Shipment Tracking
     

    Within 24 hours after dispatch, we will send the tracking number, commercial invoice, packing list and other documents to your email or communication account. You may check the shipment status online in real time.

3. General Order Rules & Notes

  1. MOQ & Sample Service

     

    We support flexible minimum order quantities for samples, small-batch and large-batch orders. All sample orders shall comply with the above shipping and payment policies.

  2. Packaging Standard

     

    All electronic components are packed with professional anti-static and shockproof materials. Original factory packaging is available for branded chips and integrated circuits.

4. Customs & Liability Statement

  1. Import Duties & Taxes

     

    All import duties, customs clearance fees and local taxes incurred for international shipments shall be borne by the buyer. We will provide complete customs documents to assist you with clearance procedures.

  2. Handling of Lost or Damaged Goods
  • In case of loss or severe damage during transit, please contact us within 48 hours after receiving the tracking information. We will assist you in filing a claim with the logistics provider.
  • We shall not be liable for any losses caused by incorrect delivery address, wrong contact information or the buyer’s refusal to complete customs clearance.

5. Local Pickup in Shenzhen

Local pickup service is available for customers in Shenzhen and surrounding areas:
  • Address: Room 2919, Guoli Building, Huaqiang North, Futian District, Shenzhen, Guangdong Province, China
  • Business Hours: 09:00 – 18:00, Monday to Friday. Closed on weekends and official public holidays.
  • Notice: Please make an appointment via email or communication tools one day in advance, and present your order information upon pickup.

Contact Information

Email: info@ic-vendor.com

Tel / WhatsApp: +86 13760382860

Service & Packaging

Materialparts is a professional electronic component supplier based in Shenzhen, China, with over 20 years of global trading experience. We integrate component procurement, quality inspection, technical support, customized packaging, and global delivery services to provide one-stop supply chain solutions. Our business covers industrial control, automotive electronics, consumer electronics, medical devices and other industries. We always adhere to genuine sources, stable supply and considerate after-sales service.

Core Services

1. One-stop Sourcing & BOM Support

We specialize in a full range of passive and active electronic components, including SMD resistors, power resistors, connectors, aviation connectors, LED beads, flexible circuit boards, printed circuit boards, and integrated circuits. Our professional team provides BOM list consolidation, component matching, and alternative model recommendation services. We support sample orders, small-batch trial production, and mass production orders with flexible MOQs to meet diverse procurement needs.

2. Genuine Product Guarantee & Full-process Quality Inspection

All products are sourced from official authorized channels and are 100% original genuine parts. Every batch of goods undergoes strict full-process quality inspection before delivery, with complete batch records and traceability documents provided. Our products comply with AEC-Q standards for automotive electronics and high-reliability specifications for medical devices. We eliminate counterfeits, refurbished parts and defective products from the source to secure your project production.

3. Fast Quotation & Order Processing

Our customer service team responds promptly to inquiries and quotation requests. All in-stock orders will be processed within one working day. We provide stocking reservation services for long-term cooperative customers, effectively solving problems such as component shortages and unstable supply chains.

4. Professional Technical Support

Our senior engineer team provides free technical consultation, model selection guidance and original manufacturer datasheets. We assist customers in solving problems related to product R&D, circuit design and component application, providing reliable technical support for project progress.

5. Sourcing for Special Components

Relying on our global supply chain network, we professionally source scarce components, obsolete parts and customized special components to efficiently solve your procurement difficulties.

6. Global Logistics & Document Services

We cooperate with mainstream international logistics providers including DHL, FedEx, UPS and TNT to achieve fast global delivery. We can provide complete export documents such as customs declaration files, commercial invoices and packing lists to ensure smooth customs clearance for international shipments. Local pickup is also available for customers in Shenzhen, China.

Professional Packaging Standards

Electronic components are sensitive to static electricity, collision, moisture and dust. We adopt industry-standard anti-static packaging solutions to fully ensure the integrity of goods during transportation and storage.

1. General Packaging Specifications

  • All components are packed separately to avoid damage caused by friction and collision;
  • Shockproof buffer materials are added for fragile products to ensure transportation safety;
  • Each package is clearly marked with part number, quantity, batch number and specifications for easy inventory counting and management.

2. Classified Professional Packaging

  • Anti-static Packaging: Static-sensitive components such as chips, circuit boards and sensors are packaged with anti-static bags, shielding boxes and conductive foam in strict accordance with international anti-static standards to prevent static damage.
  • Vacuum Moisture-proof Packaging: Moisture-sensitive components are vacuum-sealed with desiccants to isolate humid air, suitable for ocean transportation and long-term storage.
  • Original Factory Packaging: Integrated circuits of brands such as NXP are delivered with original reels, trays or tubes by default, retaining complete original packaging and adapting to automated SMT production lines.
  • Discrete Device Packaging: Discrete devices such as SMD resistors, power resistors and LEDs are quantitatively and classifiedly packaged with accurate quantity and clear marking.
  • Connector / Aviation Connector Packaging: Hard outer packaging is adopted to prevent pin bending and structural deformation.

3. Custom Packaging Services

We provide value-added services including personalized packaging, custom labeling and re-reeling according to customer requirements, fully matching your production and warehouse management standards.

Contact Information

For service consultation or packaging customization, please feel free to contact us:
Email: info@ic-vendor.com
Tel / WhatsApp: +86 13760382860
Address: Room 2919, Guoli Building, Huaqiang North, Futian District, Shenzhen, Guangdong, China
 

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Submit your component procurement and custom packaging needs via the form below. We will provide a detailed quotation and professional solution within 1–8 working hours.

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