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Active Matrix Liquid Crystal Display (AMLCD) Supply

Low-Noise, Integrated Solution Powers Active-Matrix TFT LCD Displays

Product Details

The MAX1664 integrates power-supply and backplane drive circuitry for active-matrix thin-film-transistor (TFT) liquid crystal displays. Included are a single-output, pulse-width-modulation boost converter (0.25Ω switch), a dual-output (positive and negative) gate-driver supply using one inductor, an LCD backplane driver, and a simple phase-locked loop to synchronize all three outputs.

High switching frequency (1MHz nominal) and phase-locked operation allow the use of small, minimum-height external components while maintaining low output noise. A +2.8V to +5.5V input voltage range allows operation with any logic supply. Output voltages are adjustable to +5.5V (DC-DC 1) and to +28V and-10V (DC-DC 2). The negative output voltage can be adjusted to -20V with additional components. Also included are a logic-level shutdown and a "Ready" output (RDY) that signals when all three outputs are in regulation.

The boost-converter operating frequency can be set at 16, 24, or 32 times the backplane clock. This flexibility allows a high DC-DC converter frequency to be used with LCD backplane clock rates ranging from 20kHz to 72kHz. The MAX1664 is supplied in a 1.1mm-high TSSOP package.

Key Features

  • Integrates All Active Circuitry for Three DC-DC Converters
  • Ultra-Small External Components (ceramic capacitors, 2µH to 5µH inductors)
  • DC-DC Converters Phase-Locked to Backplane Frequency for Lowest Noise
  • Low Operating Voltage (down to +2.8V)
  • Adjustable Output Voltage from VIN to +5.5V
  • Load Currents Up to 500mA
  • Adjustable TFT Gate Driver Output:
    • Positive, VIN to +28V
    • Negative, 0 to -10V (-20V with added components)
  • Includes 0.35Ω Backplane Driver
  • 1µA Shutdown Current
  • Power-Ready Output Signal

Applications/Uses

  • LCD Modules
  • LCD Panels

Simplified Block Diagram

MAX1664: Typical Operating Circuit MAX1664: Typical Operating Circuit Zoom icon

Technical Docs

Design & Development

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Support & Training

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Parameters

Key Features

  • Integrates All Active Circuitry for Three DC-DC Converters
  • Ultra-Small External Components (ceramic capacitors, 2µH to 5µH inductors)
  • DC-DC Converters Phase-Locked to Backplane Frequency for Lowest Noise
  • Low Operating Voltage (down to +2.8V)
  • Adjustable Output Voltage from VIN to +5.5V
  • Load Currents Up to 500mA
  • Adjustable TFT Gate Driver Output:
    • Positive, VIN to +28V
    • Negative, 0 to -10V (-20V with added components)
  • Includes 0.35Ω Backplane Driver
  • 1µA Shutdown Current
  • Power-Ready Output Signal

Applications/Uses

  • LCD Modules
  • LCD Panels

Description

The MAX1664 integrates power-supply and backplane drive circuitry for active-matrix thin-film-transistor (TFT) liquid crystal displays. Included are a single-output, pulse-width-modulation boost converter (0.25Ω switch), a dual-output (positive and negative) gate-driver supply using one inductor, an LCD backplane driver, and a simple phase-locked loop to synchronize all three outputs.

High switching frequency (1MHz nominal) and phase-locked operation allow the use of small, minimum-height external components while maintaining low output noise. A +2.8V to +5.5V input voltage range allows operation with any logic supply. Output voltages are adjustable to +5.5V (DC-DC 1) and to +28V and-10V (DC-DC 2). The negative output voltage can be adjusted to -20V with additional components. Also included are a logic-level shutdown and a "Ready" output (RDY) that signals when all three outputs are in regulation.

The boost-converter operating frequency can be set at 16, 24, or 32 times the backplane clock. This flexibility allows a high DC-DC converter frequency to be used with LCD backplane clock rates ranging from 20kHz to 72kHz. The MAX1664 is supplied in a 1.1mm-high TSSOP package.

Simplified Block Diagram

MAX1664: Typical Operating Circuit MAX1664: Typical 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