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TFT, LCD, DC-DC Converter with Operational Amplifiers

Product Details

Key Features

Simplified Block Diagram

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Key Features

  • 1.8V to 5.5V Input Supply Range
  • 600kHz/1.2MHz Current-Mode Step-Up Regulator
    Fast Transient Response to Pulsed Load
    High-Accuracy Output Voltage (1.5%)
    Built-In 14V, 1.9A, 0.2Ω n-Channel MOSFET
    High Efficiency (> 85%)
    Digital Soft-Start
  • Two High-Performance Operational Amplifiers
  • ±150mA Output Short-Circuit Current
    7.5V/µs Slew Rate
    12MHz, -3dB Bandwidth
    Rail-to-Rail Inputs/Outputs
  • Logic-Controlled, High-Voltage Switch with Adjustable Delay
  • Built-In Power-Up Sequence
  • Input Supply Undervoltage Lockout
  • Timer Delay Fault Latch for All Regulator Outputs
  • Thermal-Overload Protection
  • Applications/Uses

    • LCD Monitor Panels
    • Notebook Computer Displays

    Description

    The MAX8739 includes a high-performance, step-up regulator and two high-current operational amplifiers for active-matrix thin-film transistor (TFT) liquid-crystal displays(LCDs). The input supply voltage range of the MAX8739 is from 1.8V to 5.5V. The device also includes a logic-controlled, high-voltage switch with adjustable delay.

    The step-up DC-DC converter provides the regulated supply voltage for the panel source driver ICs. The converter is a high-frequency (600kHz/1.2MHz) current-mode regulator with an integrated 14V n-channel MOSFET that allows the use of ultra-small inductors and ceramic capacitors. It provides fast transient response to pulsed loads while achieving efficiencies over 85%.

    The two high-performance operational amplifiers are designed to drive the LCD backplane (VCOM) and/or the gamma-correction-divider string. The devices feature high output current (±150mA), fast slew rate (7.5V/µs), wide bandwidth (12MHz), and rail-to-rail inputs and outputs.

    The MAX8739 is available in a 20-pin, 5mm x 5mm thin QFN package with a maximum thickness of 0.8mm for ultra-thin LCD panels.

    Simplified Block Diagram

    MAX8739: Typical Simplified Circuit MAX8739: Typical Simplified Circuit Zoom icon

    Technical Docs

    Support & Training

    Search our knowledge base for answers to your technical questions.

    Filtered Search

    Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .