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TFT LCD DC-to-DC Converter with Operational Amplifiers

TFT LCD DC-DC Converters Include a High-Performance Boost Regulator and Two High-Current Operational Amplifiers for Active-Matrix, Thin-Film Transistor (TFT), Liquid-Crystal Displays (LCDs)

Product Details

Key Features

Applications/Uses

Simplified Block Diagram

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Key Features

  • Ultra-High-Performance Step-Up Regulator
    • Fast Transient Response to Pulsed Load Using Current-Mode Control Architecture
    • High-Accuracy Output Voltage (1.3%)
    • Built-In 14V, 1.2A, 0.2Ω N-Channel Power MOSFET with Lossless Current-Sensing
    • High Efficiency (85%)
    • 8-Step Current-Controlled 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
    • Unity Gain Stable
  • Logic-Controlled High-Voltage Switch with Adjustable Delay
  • Timer Delay Latch FB Fault Protection
  • Thermal Protection
  • 2.6V to 5.5V Input Operating Voltage Range
  • 3.6mA (Switching), 0.45mA (Not Switching) Quiescent Current
  • Ultra-Thin 20-Pin Thin QFN Package (5mm x 5mm x 0.8mm)

Applications/Uses

  • Car-Navigation Displays
  • LCD Monitor Panels
  • Notebook Computer Displays
  • PDAs

Description

The MAX1542/MAX1543 include a high-performance boost regulator and two high-current operational amplifiers for active matrix, thin-film transistor (TFT), liquid-crystal displays (LCDs). Also included is a logic- controlled, high-voltage switch with adjustable delay. The MAX1543 includes an additional high-voltage load switch and features pin-selectable boost regulator switching frequency.

The step-up DC-to-DC converter is a high-frequency 640kHz (MAX1543)/1.2MHz (MAX1542/MAX1543) 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 while producing efficiencies over 85%.

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

The MAX1542/MAX1543 are available in 20-pin thin QFN packages with a maximum thickness of 0.8mm for ultra-thin LCD panel design.

Simplified Block Diagram

MAX1542, MAX1542ETP, MAX1543: Functional Diagram MAX1542, MAX1542ETP, MAX1543: Functional Diagram 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 .