The 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.
By controlling EN1, EN2 and connecting two external capacitors to DLY1, DLY2, the best power up sequencing of AAT1178A can be achieved
PG2 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.
With the minimal external components, the AAT1178A offers a simple and economical solution for TFT LCD TV power solution.