Low-Cost, Linear-Regulator LCD Panel Power Supplies

The MAX8710/MAX8711/MAX8712 offer complete linear-regulator power-supply solutions for thin-film transistor (TFT) liquid-crystal-display (LCD) panels used in LCD monitors and LCD TVs. All three devices include a high-performance AVDD linear regulator, a positive charge-pump regulator, a negative charge-pump regulator, and built-in power-up sequence control. The MAX8710 and MAX8711 also include a high-current operational amplifier. Additionally, the MAX8710 provides logic-controlled high-voltage switches to control the positive charge-pump output.

The linear regulator directly steps down the input voltage to generate the supply voltage for the source-driver ICs (AVDD). The two built-in charge-pump regulators are used to generate the TFT gate-on and gate-off supplies. The high-current operational amplifier is typically used to drive the LCD backplane (VCOM) and features high output current (150mA), fast slew rate (12V/µs), and wide bandwidth (12MHz). Its rail-to-rail inputs and output maximize flexibility.

The MAX8710 is available in a 24-pin thin QFN package, the MAX8711 is available in a 16-pin thin QFN package, and the MAX8712 is available in a 12-pin thin QFN package. All three packages are 4mm x 4mm with a maximum thickness of 0.8mm for ultra-thin LCD panel design. They operate over the -40°C to +100°C temperature range.

Applications

* LCD Monitor Panel Modules * LCD TV Panel Modules

* High-Performance Linear Regulator

* 1.6% Output Accuracy

* Works with Small Ceramic Output Capacitors

* Fast Transient Response

* Foldback Current Limit

* 50mA Negative Regulated Charge Pump

* 20mA Positive Regulated Charge Pump with Adjustable Delay

* Built-In Power-Up Sequence

* High-Current Operational Amplifier (MAX8710/MAX8711)

* ±150mA Output Short-Circuit Current

* 12V/µs Slew Rate

* 12MHz, -3dB Bandwidth

* Rail-to-Rail Inputs/Output

* Dual Mode™ High-Voltage Switches (MAX8710)

* Thermal Protection

* Latched Fault Protection with Timer