描述 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.

特性 Features

◆ 2.5V to 5.5V input supply
◆ Active-high Enable Control
◆ Current-mode boost regulator
????? - 1.2MHz switching frequency
????? - Integrated 20V/1.8A 700m? 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
?

應(yīng)用 Application

◆ TFT LCD for Notebooks
◆ Tablet Personal Computer Display
◆ Car Navigation Display
◆ Portable equipment
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