EC9219 – TFT- LCD DC-DC Converters with OP Amp

General description

The EC9219 include a high-performance step-up regulator, and high-current operational amplifiers for active-matrix thin-film transistor (TFT) liquid-crystal displays (LCDs).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 or 640KHZ) current-mode regulator with an integrated 18V 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 EC9219 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 (17V/μs), wide bandwidth (12MHz), and rail-to-rail inputs and outputs The EC9219 are available in 14- pin thin TSOP packages with a maximum thickness of 1mm for ultra-thin LCD panels.

Features

  • 2.6V to 5.5V Input Supply Range
  • 1.2MHz or 640KHZ Current-Mode Step-Up Regulator
  • Fast Transient Response to Pulsed Load
  • High-Accuracy Output Voltage ( 2% )
  • Built-In 18V, 1.6A, 0.16Ω N-Channel MOSFET
  • High Efficiency (90%)
  • High-Performance Operational Amplifiers
  • 17V/μs Slew Rate
  • 12MHz, -3dB Bandwidth
  • Rail-to-Rail Inputs/Outputs
  • Thermal-Overload Protection

Applications

  • Notebook Computer Displays
  • LCD Monitor Panels
  • Automotive Displays

Pin Configurations

Ordering info

Typical Applications circuit

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