Low-Cost Linear-Regulator LCD Panel Power Supplies
Description
19-3174; Rev 1; 10/05
KIT ATION EVALU LE B A IL A AV
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Low-Cost, Linear-Regulator LCD Panel Power Supplies
General Description Features
♦ 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/MAX8761) ±150mA Output Short-Circuit Current 12V/µs Slew Rate 12MHz, -3dB Bandwidth Rail-to-Rail Inputs/Output ♦ Dual-Mode™ High-Voltage Switches (MAX8710/MAX8761) ♦ Thermal Protection ♦ Latched Fault Protection with Timer
MAX8710/MAX8711/MAX8712/MAX8761
The MAX8710/MAX8711/MAX8712/MAX8761 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 four devices include a high-performance AV DD linear regulator, a positive charge-pump regulator, a negative charge-pump regulator, and built-in power-up sequence control.
The MAX8710/MAX8711/MAX8761 also include a high-current operational amplifier.
Additionally, the MAX8710/ MAX8761 provide 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 (AV DD ).
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/MAX8761 are 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 ...
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