High-Current VCOM Drive Buffers for TFT LCDs

The MAX9550/MAX9551/MAX9552 provide a VCOM source for TFT LCDs. The MAX9550/MAX9551/MAX9552 source and sink a large current to quickly restore the VCOM voltage, making it ideal for TFT LCDs. The output settles to within 0.1% in less than 2µs. In addition, the MAX9550/MAX9551/MAX9552 directly drive the capacitive load in the VCOM layer of the TFT LCDs without the need for a series resistor.

The MAX9550/MAX9551/MAX9552 feature single, dual, and quad channel VCOM amplifiers, respectively. The MAX9550/MAX9551/MAX9552 can drive up to 800mA of peak current per channel and operate up to 20V. The devices feature soft-start to reduce inrush current, output short-circuit protection, and thermal shutdown.

The MAX9550 is available in a space-saving 5-pin thin SOT23 package, and an 8-pin µMAX® package with an exposed paddle. The MAX9551 is available in an 8-pin µMAX package with an exposed paddle. The MAX9552 is available in a 14-pin TSSOP package. All devices are specified over the -40°C to +85°C temperature range.

Applications

* Displays: LCD * Flat-Panel and Plasma TVs * Instrument Control Voltage Sources * TFT LCD Panels

* Operates Up to 20V

* 800mA Peak Output Current

* Settles to Within 0.1% of VOUT in Less than 2µs

* Excellent Load Regulation

* Thermal-Shutdown Protection

* Short-Circuit Protection to Both Rails

* Soft-Start to Reduce Inrush Current