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AAT2822

Advanced Analogic Technologies
Part Number AAT2822
Manufacturer Advanced Analogic Technologies
Description (AAT2822 - AAT2825) TFT-LCD DC-DC Converter
Published Jul 24, 2010
Detailed Description AAT2822/23/24/25 www.DataSheet4U.com PRODUCT DATASHEET SystemPowerTM TFT-LCD DC-DC Converter with WLED Driver and VCO...
Datasheet PDF File AAT2822 PDF File

AAT2822
AAT2822

Overview
AAT2822/23/24/25 www.
DataSheet4U.
com PRODUCT DATASHEET SystemPowerTM TFT-LCD DC-DC Converter with WLED Driver and VCOM Buffer Features LCD Bias Power • 2.
5V to 5.
5V Input Supply Range • 1.
3MHz Fixed Frequency Current-Mode Step-Up Regulator • Fast Transient Response • Adjustable Voltage up to 14.
5V ▪ ±1% Typical Accuracy • High Efficiency (93%) @ 50mA Output Current • Small External Inductor and Capacitors • Integrated Soft Start and Sequencing of All Rails • Short-Circuit, Over-Voltage, and Over-Temperature Protection Positive Output, VGH • Up to 13.
2V Input Supply (VDD) • Adjustable Voltage up to 30V @ 20mA ▪ ±3% Typical Accuracy Negative Output, VGL • Up to 13.
2V Input Supply (VDD) • Adjustable Voltage down to -30V @ 20mA ▪ ± 3% Typical Accuracy WLED Driver • Input Voltage Range: 2.
5V to 25V • Maximum Continuous Output: ▪ 12V @ 260mA ▪ 28V @ 50mA • Panel sizes from 5" – 10" ▪ 5.
0" 3S5P ▪ 5.
6" 3S6P ▪ 7.
0" 3S9P ▪ 8.
0" 3S10P/11P ▪ 10" 3S13P • Constant LED Current with 6% Accuracy • PWM Dimming Control ▪ Up to 1kHz • 1.
3MHz Switching Fixed Frequency ▪ Up to 90% Efficiency VCOM Buffer • High-Performance ▪ 13V/μs Slew Rate ▪ 12MHz, -3dB Bandwidth • ±75mA Output Short-Circuit Current • Low 1.
5mA Quiescent Current General Description The AAT2822-AAT2825 family of integrated panel power solutions provides the regulated voltages required by an active-matrix thin-film transistor (TFT) liquid-crystal display (LCD).
The AAT2822 includes a triple-output DC-DC converter, a LED backlight driver, and a VCOM buffer in a 4 mm x 4mm TQFN package.
The primary 1.
3MHz DC-DC boost converter uses an ultra-small inductor and ceramic capacitor to generate output voltage (VAVDD) of up to 14.
5V for the charge pumps.
The low on-resistance of the integrated power MOSFET allows for efficiency up to 93%.
The two charge pumps independently regulate a positive output (VGH) and a negative output (VGL).
These lowpower outputs use external diode and capacitor stages to regulate output voltages up ...


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