描述 Description

\tThe AAT1178A is a 4-channel TFT LCD power solution that provides a step-up PWM controller (AVDD), a step-down PWM (V3P3) and two high voltage charge pump drivers for VGH and VGL.


\tBy controlling EN1, EN2 and connecting two external capacitors to DLY1, DLY2, the best power up sequencing of AAT1178A can be achieved


\tPG2 is an open-drain output signal which goes low when the step-up PWM (AVDD) is within regulation. Connecting PG2 to an extra PMOS transistor can keep VS low before AVDD is ready.


\tWith the minimal external components, the AAT1178A offers a simple and economical solution for TFT LCD TV power solution.

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特性 Features

? 8V to 14V Input Voltage Range
? Maximum 18V VS Voltage
? Built in 3A, 0.25Ω Switching NMOS for VS
? Built in 3A, 0.25Ω Switching NMOS for V3P3
? Positive Charge Pump up to 40V/50mA
? Negative Charge Pump Down to 14V/50mA
? Adjustable Power on Sequencing
? 500k/750kHz Fixed Switching Frequency
? Low Dissipation Current
? TSSOP-28Power Pad Package Available

應(yīng)用 Application

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