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TFT LCD DC-DC Converter with Integrated Charge Pumps

Product Details

Key Features

Simplified Block Diagram

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Key Features

  • 3 Integrated DC-DC Converters, 1 LDO
  • 1MHz Current-Mode PWM Boost Regulator
    Up to +13V Main High-Power Output
    ±1% Accuracy
    High Efficiency (90%)
  • Dual Charge-Pump Outputs
  • No External Diodes for Positive Charge Pump
    Up to +28V Positive Charge-Pump Output
    Negative Charge-Pump Output
  • 300mA Logic Linear Regulator
  • +2.6V to +5.5V Input Operating Range
  • 0.8mA Quiescent Current
  • Internal Supply Sequencing and Soft-Start
  • Thermal Protection
  • Ultra-Thin, 28-Pin TQFN Package (0.8mm max)
  • Applications/Uses

    • Car-Navigation Displays
    • LCD Monitors
    • Notebook Computers, PDAs

    Description

    The MAX8753 quadruple-output DC-DC converter provides the regulated voltages required by active-matrix, thin-film transistor (TFT), liquid-crystal displays (LCDs). It includes a high-power step-up regulator (VMAIN), two low-power charge pumps (VPOS and VNEG), and a low-voltage 300mA linear regulator (VLOGIC).

    The step-up DC-DC converter is a high-frequency (1MHz) current-mode regulator with a built-in power MOSFET that allows the use of ultra-small inductors and ceramic capacitors. It provides fast transient response to pulsed loads and includes an automatic pulse-skipping mode that increases efficiency over a wide-load current range. The 1.5A current limit allows a +10V output at more than 300mA from a +3.3V input.

    The two charge pumps independently regulate one positive and one negative output voltage. The positive charge pump is a voltage tripler that accepts an input voltage up to +13V and delivers a 20mA output up to +28V without external switches or diodes. The negative charge pump inverts an input voltage up to +24V and delivers a 20mA negative output using external diodes.

    The logic linear regulator converts the IC's +2.6V-to-+5.5V input to a regulated +2.5V or adjustable output. The MAX8753 is available in a 28-pin thin QFN package with a maximum thickness of 0.8mm for ultra-thin LCD panel design.

    Simplified Block Diagram

    MAX8753: Minimal Operating Circuit MAX8753: Minimal Operating 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 .