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EC9223-Multi-Channel TFT LCD Supply

General description

TheEC9223 is an integrated power supply solution optimized for small to medium size thin- film transistor (TFT) liquid crystal displays (LCD’s). The boost converter operates  at a fixed frequency of 1.2MHz. The integrated N-channel FET has a current limit of 1.8A. The positive and negative charge pumps provide regulated  TFT  LCD  gate-on  and gate-off supplies. Both outputs can be adjusted by external resistive voltage dividers.

The integrated operational amplifier is typically used for LCD VCOM driving; the output can sink or source up to 150mA short-circuit current. A built-in voltage detector generates a reset signal when the input voltage drops below 2.6V. The reset signal is active low and has a 123ms blanking time during power-on. The EC9223 is available in a thin 16-pin 3x3 mm WQFN green package.

Features

2.5V to 5.5V input supply

Active-high Enable Control

Current-mode boost regulator

      - 1.2MHz switching frequency

      - Integrated 20V/1.8A 700mΩ FET

      - Fast transient response to pulsed load

      - High efficiency up to 90%

      - Adjustable high-accuracy output voltage(±1%)

VGH positive charge pump

VGL negative charge pump

Integrated unity-gain VCOM buffer

      - ±150mA output current limit

      - 12V/us slew rate

      - 12MHz Bandwidth

  Low-voltage detection circuit

Soft-start and timed delay fault latch for all outputs

Thermal shutdown

Thin 3x3 mm 16-lead WQFN package

 

Applications

TFT LCD for Notebooks

Tablet Personal Computer Display

Car Navigation Display

Portable equipment

 

Pin Configurations

Ordering info

Typical Applications circuit

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