The MAX9550/MAX9551/MAX9552 are three VCOM drive buffers that provide a VCOM source for TFT LCDs. They can provide high current to quickly restore the VCOM voltage, making them ideal for TFT LCDs. The output settles to within 0.1% of VOUT in less than 2µs. In addition, the MAX9550/MAX9551/MAX9552 can directly drive the capacitive load in the VCOM layer of the TFT LCDs without the need for a series resistor. The MAX9550/MAX9551/MAX9552 are 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.
The MAX9550/1/2 series provides a VCOM source for TFT LCD panels, directly driving the capacitive load without a series resistor. Each device delivers up to 800 mA peak current per channel, settles to within 0.1 % of the target voltage in less than 2 µs, and includes soft‑start, short‑circuit, and thermal‑shutdown protection.
Available in thin‑SOT23, µMAX, and TSSOP packages, the buffers operate from 6 V to 20 V (or ±3 V to ±10 V dual supplies) and are specified over a –40 °C to +85 °C temperature range. Recommended layout includes low‑ESR bypass capacitors placed close to the OUT pin and grounding the exposed paddle for optimal thermal performance.
| Peak Output Current | 800 mA per channel |
|---|---|
| Operating Voltage | Up to 20 V |
| Operating Temperature Range | -40 °C to +85 °C |
| Supply Voltage Range | -0.3 V to +22 V |
Each device can source or sink up to 800 mA of peak current per channel.
They include soft‑start to reduce inrush current, short‑circuit protection on both rails, and thermal‑shutdown with temperature hysteresis.
They operate from 6 V to 20 V single‑supply, or from ±3 V to ±10 V dual supplies.