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Power Switching Regulator - Switching Regulators MAX8740
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MAX8740

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TFT-LCD Step-Up DC-DC Converter

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Product Details

Key Features

Simplified Block Diagram

Technical Docs

Data Sheet TFT-LCD Step-Up DC-DC Converter May 25, 2005

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Key Features

  • 90% Efficiency
  • Adjustable Output from VIN to 28V
  • 2.6V to 5.5V Input Supply Range
  • Input Supply Undervoltage Lockout
  • Pin-Programmable 640kHz/1.2MHz Switching Frequency
  • Programmable Soft-Start
  • 0.1µA Shutdown Current
  • Small, 10-Pin Thin DFN Package

    • Applications/Uses

    • LCD Monitor Panels
    • Notebook Computer Displays

    Description

    The MAX8740 is a high-performance, step-up DC-DC converter that provides a regulated supply voltage for active-matrix, thin-film transistor (TFT), liquid-crystal displays (LCDs). The MAX8740 incorporates currentmode, fixed-frequency, pulse-width modulation (PWM) circuitry with a built-in n-channel power MOSFET to achieve high efficiency and fast transient response.

    Users can select 640kHz or 1.2MHz operation using a logic input pin (FREQ). The high switching frequencies allow the use of ultra-small inductors and low-ESR ceramic capacitors. The current-mode architecture provides fast transient response to pulsed loads. A compensation pin (COMP) gives users flexibility in adjusting loop dynamics. The 30V internal MOSFET can generate output voltages up to 28V from a 2.6V and 5.5V input voltage range. Soft-start slowly ramps the input current and is programmed with an external capacitor.

    The MAX8740 is available in a 10-pin thin DFN package.

    Simplified Block Diagram

    MAX8740: Typical Operating Circuit MAX8740: Typical Operating Circuit Zoom icon

    Technical Docs

    Data Sheet TFT-LCD Step-Up DC-DC Converter May 25, 2005

    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 .