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ADD8754:  LCD Panel Power, VCOM,and Gate Modulation

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 ...More

ADD8754:  LCD Panel Power, VCOM,and Gate Modulation

Product Description

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

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    EVALUATION BOARDS & DEVELOPMENT KITS

    • 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
    • Vcc-Vee Supply (V): 8 to 18
    • Iq per Amplifier: n/a
    • -3dB Bandwidth: 1.95MHz
    • Aol: n/a
    • I out Capability: 300mA
    • Capacitive Load: n/a
    • Slew Rate: 105V/µs
    • Vos: 19mV
    • Ib: 50nA
    • Features: Buffer,Power Down,Single Supply
    • Packages: CSP

    Functional Block Diagram for ADD8754

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    AD8560 16V 1mA 8MHz n/a 35mA n/a 8V/µs 2mV 80nA $1.02 16 V, 5-Channel, Rail - to - Rail Buffer Amplifier for LCD Monitor Applications
    ADD8504 6.5V 0.95mA n/a n/a 20mA 1nF 7V/µs 20mV 2nA $0.80 4 - Channel LCD Gamma Reference Buffer in 16 - Lead TSSOP
    ADD8505 6.5V 0.88mA n/a n/a 20mA 1nF 7V/µs 20mV 2nA $0.87 5 - Channel LCD Gamma Reference Buffer in 20 - Lead TSSOP
    ADD8506 6.5V 0.85mA n/a n/a 20mA 1nF 7V/µs 20mV 2nA $0.96 6 - Channel Muxed Input, LCD Gamma Reference Buffer in 24 - Lead TSSOP
    ADD8754 18V n/a 1.95MHz n/a 300mA n/a 105V/µs 19mV 50nA - VCOM Amplifier with LCD Panel Power & Gate Pulse Modulation Ciruitry
    AD8531 6V 1.25mA 3MHz 98dB 250mA 1nF 5V/µs 25mV 5pA $0.27 250 mA Output Current, Rail-Rail In/Out, Single-Supply Operational Amplifier
    AD8509 6.5V 944µA n/a n/a 20mA 1000pF 7V/µs 20mV 50nA $3.77 9-Channel, Multiplexed Input, LCD Driver
    AD8532 6V 1.25mA 3MHz 70dB 250mA 10nF 5V/µs 25mV 5pA $0.43 Dual, 250 mA Output Current, Rail-Rail In/Out, Single-Supply Operational Amplifier
    AD8511 6.5V 773µA n/a n/a 20mA 1000pF 7V/µs 20mV 50nA $3.99 11-Channel, Multiplexed Input, LCD Driver
    AD8534 6V 1.25mA 3MHz 70dB 250mA 10nF 5V/µs 25mV 5pA $0.60 Quad, 250 mA Output Current, Rail-Rail In/Out, Single-Supply Operational Amplifier
    AD8519 12V 1.2mA 8MHz 100dB 25mA 600pF 2.9V/µs 600µV 300nA $0.92 8 MHz, Rail-Rail Out, Operational Amplifier
    AD8529 12V 1.2mA 8MHz 100dB 25mA 600pF 2.9V/µs 600µV 300nA $1.22 Dual, 8 MHz, Rail-Rail Out, Operational Amplifier
    ADD8708 16.5V 0.9mA 4.5MHz n/a 150mA 200pF 6V/µs 5mV 500nA - 18 - Channel Gamma Buffer with Regulator
    ADD8701 16V 1mA 4.5MHz n/a 35mA n/a 6V/µs 4mV 500nA - Low Cost, 16 V, 12-Channel Gamma Buffer w/ Integrated High Drive Amplifier
    AD8565 16V 850µA 5MHz 80dB 35mA 1nF 6V/µs 2mV 600nA $0.56 16V, Single-Supply, Rail-Rail In/Out, Operational Amplifier
    AD8568 16V 850µA 6MHz n/a 35mA 1µF 6V/µs 2mV 600nA - Rail-Rail In/Out, Single-Supply Buffer Amplifier
    ADD8709 16.5V 0.94mA 4.5MHz n/a 15mA 200pF 6V/µs 5mV 1.5µA - 18-Channel Gamma Buffer with Regulator
    AD8566 16V 850µA 5MHz 80dB 35mA 1nF 6V/µs 2mV 600nA $0.71 16V, Single-Supply, Rail-Rail In/Out, Dual Operational Amplifier
    ADD8710 18V 0.91mA 5MHz n/a 10mA n/a 8V/µs 4mV 500nA $1.84 10-Channel Gamma Buffer with Vcom Driver
    AD8567 16V 850µA 5MHz 80dB 35mA 1nF 6V/µs 2mV 600nA $0.93 16V, Single-Supply, Rail-Rail In/Out, Quad Operational Amplifier
    ADD8706 16.5V 1.35mA 6MHz 80dB 15mA n/a 6V/µs 2mV 400nA - 16 V, (5 + 1)-Channel Operational Amplifier
    AD8614 18V 1.1mA 5.5MHz 100dB 30mA 2nF 7.5V/µs 1mV 80nA $1.15 Rail-Rail In/Out, 70 mA Output Current, Single-Supply Op Amp
    AD8024 24V 17mA 200MHz 280dB 50mA 1nF 390V/µs 2mV 1µA $4.32 Quad, 350 MHz, 24 V Amplifier
    AD8569 16V 850µA 6MHz n/a 35mA 1µF 6V/µs 2mV 600nA - Quad, Rail-Rail In/Out, Single-Supply Buffer Amplifier
    AD8641 26V 290µA 3.5MHz 103dB 12mA 500pF 3V/µs 50µV 0.25pA $1.47 Low Power, Rail-to-Rail Output Precision JFET Amplifier
    AD8644 18V 1.1mA 5.5MHz 100dB 30mA 2nF 7.5V/µs 1mV 80nA $2.30 Quad, Rail-Rail In/Out, 70 mA Output Current, Single-Supply Op Amp
    AD8570 16V 850µA 6MHz n/a 35mA 1µF 6V/µs 2mV 600nA - Octal, Rail-Rail In/Out, Single-Supply Buffer Amplifier
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    * The pricing listed here is provided only for budgetary purposes as recommended list price in U.S. Dollars in the United States ex factor per unit for the stated volume. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.
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