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ADD8754:  LCD Panel Power, VCOM,and Gate Modulation

Product Details


The ADD8754 is optimized for use in TFT LCD applications, requiring only external charge pump components to provide all the requirements for panel power, VCOM, and gate modulation. Included in a single chip are a high frequency step-up dc-to-dc switching regulator, logic voltage regulator, VCOM amplifier, and gate pulse modulation circuitry.

The step-up dc-to-dc converter provides up to 20 V output and includes a 2 A internal switch. Either a 650 kHz or 1.2 MHz step-up switching regulator frequency can be chosen, allowing easy filtering and low noise operation. It achieves 93% efficiency and features soft start to limit the inrush current at startup.

The internal voltage regulator operates with an input voltage range of 3 V to 5.5 V and delivers a load current of up to 350 mA. Three selectable output voltages are available: 2.5 V, 2.85 V, and 3.3 V.

The proprietary VCOM amplifier can deliver a peak output current of 300 mA and is specifically designed to drive TFT panel loads.

The gate pulse modulator allows shaping of the TFT gate high voltage to improve image quality. The integrated switches provide the ability to independently control the delay and slope for the gate drive voltage.

The ADD8754 is offered in a 24-lead, Pb-free LFCSP package and is specified over the industrial temperature range of −40 to +85°C.

Applications

  • TFT LCD Panels for Monitors, TVs, and Notebooks

FEATURES and BENEFITS

  • Step-up Switching Regulator with 2 A power Switch
  • 650 kHz or 1.2 MHz Switching Frequency
  • Output Adjustable to 20 V
  • 350 mA Logic Voltage Regulator
  • Selectable Output Voltages: 2.5 V, 2.85 V,
    3.3 V
  • VCOM Amplifier with 300 mA Drive
  • Gate Pulse Modulation Circuitry
  • Independently Adjustable Delay and Falling Slope
  • 3 V to 5.5 V Input
  • Undervoltage Lockout
  • Thermal Shutdown
  • 24-lead, Pb-free LFCSP Package

Functional Block Diagram for ADD8754

Documentation

Title Content Type File Type
ADD8754: LCD Panel Power, VCOM,and Gate Modulation Data Sheet (Rev 0, 05/2005) (pdf, 510 kB) Data Sheets PDF
Introduction to ADIsimPower
ADIsimPower is a smart selector and a collection of downloadable tools that produce complete and optimized power designs. Schematic, bill of materials, and performance data are customized to your specific needs in minutes.
Videos HTML
Advantiv™ Advanced Television Solutions  (pdf, 549 kB)
Enhancing the HD system design and consumer experience, Analog Devices offers its Advantiv portfolio of video and audio integrated circuit solutions, specifically developed and optimized for advanced television applications.
Overview PDF
RAQs index Rarely Asked Questions HTML
Glossary of EE Terms Glossary HTML

Design Tools,Models,Drivers & Software

Title Content Type File Type
Download files for ADIsimPower™ Voltage Regulator Design Tool
The individual Excel-based voltage regulator design tools used in ADIsimPower™.
ADIsim Design/Simulation Tools HTML
Launch of ADIsimPower Voltage Regulator Selection Vin (min) V Vout V   Find Solutions
Vin (max) V Iout A

Evaluation Kits & Symbols & Footprints

Evaluation Boards & KitsView the Evaluation Boards and Kits page for documentation and purchasing

Symbols and Footprints— Analog Devices offers Symbols & Footprints which are compatible with a large set of today’s CAD systems for broader and easier support.


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