MAX1516A
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MAX1516A

TFT-LCD DC-DC Converters with Operational Amplifiers

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TFT LCD, DC-DC Converters with a High-Performance Step-Up Regulator, Two Linear-Regulator Controllers, and High-Current Operational Amplifiers for Active-Matrix, Thin-Film Transistor (TFT) LCDs

Part Details
Features
  • 2.6V to 5.5V Input Supply Range
  • 1.2MHz Current-Mode Step-Up Regulator
    • Fast Transient Response to Pulsed Load
    • High-Accuracy Output Voltage (1.5%)
    • Built-In 14V, 2.4A, 0.16Ω n-Channel MOSFET
    • High Efficiency (90%)
  • Linear-Regulator Controllers for VGON and VGOFF
  • High-Performance Operational Amplifiers
    • ±150mA Output Short-Circuit Current
    • 13V/µs Slew Rate
    • 12MHz, -3dB Bandwidth
    • Rail-to-Rail Inputs/Outputs
  • Logic-Controlled, High-Voltage Switch with Adjustable Delay
  • Timer-Delay Fault Latch for All Regulator Outputs
  • Thermal-Overload Protection
  • 0.6mA Quiescent Current
Additional Details
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The MAX1516A/MAX1517A/MAX1518A include a high-performance step-up regulator, two linear-regulator controllers, and 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 step-up DC-DC converter provides the regulated supply voltage for the panel source driver ICs. The converter is a high-frequency (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 gate-on and gate-off linear-regulator controllers provide regulated TFT gate-on and gate-off supplies, using external charge pumps attached to the switching node. The MAX1518A includes five high-performance operational amplifiers, the MAX1517A includes three, and the MAX1516A includes one operational amplifier. These 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 (13V/µs), wide bandwidth (12MHz), and rail-to-rail inputs and outputs.

The MAX1516A/MAX1517A/MAX1518A are available in 32-pin thin QFN packages with a maximum thickness of 0.8mm for ultra-thin LCD panels.

Applications

  • LCD Monitor Panels
  • Notebook Computer Displays

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