DATA SHEET
AAT2822/2823/2824/2825
TFT-LCD DC/DC Converter with WLED Driver and VCOM Buffer
General Description
Features
The AAT2822-AAT2825 family of integrated panel power
solutions provides the regulated voltages required by an
active-matrix thin-film transistor (TFT) liquid-crystal dis-
play (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%.
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
▪
•
•
•
Small External Inductor and Capacitors
Integrated Soft Start and Sequencing of All Rails
Short-Circuit, Over-Voltage, and Over-Temperature
Protection
Positive Output, VGH
The two charge pumps independently regulate a positive
output (VGH) and a negative output (VGL). These low-
power outputs use external diode and capacitor stages
to regulate output voltages up to +30V and down to
-30V. A proprietary regulation algorithm minimizes out-
put ripple when using small capacitors.
•
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
The high efficiency backlight driver provides a constant
current output capable of boosting up to 28V. The driver
is an ideal power solution for backlight applications with
up to seven white LEDs in series or up to 39 white LEDs
in a parallel and series configuration. LED brightness is
PWM controlled up to 1kHz. Filtered PWM is supported
for higher frequencies.
± 3% Typical Accuracy
▪
WLED Driver
•
•
Input Voltage Range: 2.5V to 25V
Maximum Continuous Output:
12V @ 260mA
28V @ 50mA
Panel sizes from 5" – 10"
▪
▪
•
The high slew rate operational amplifier is suitable for
VCOM buffering and gain adjustment.
5.0" 3S5P
5.6" 3S6P
7.0" 3S9P
8.0" 3S10P/11P
▪
▪
▪
The sequencing of the power supplies ensures proper
panel startup and avoid damage to the device.
▪
10" 3S13P
▪
The AAT2822 family is available in a Pb-free, 24-pin 4 x
4mm TQFN package and operates over the -40°C to
+85°C temperature range.
•
•
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
▪
▪
•
•
Applications
•
•
•
•
Automotive Displays
Digital Photo Frames
Netbooks
PNDs
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
1
202081B
• Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • August 2, 2012
5秒后页面跳转
全球首块英伟达H200交付 黄仁勋“送货上门”
常用8脚开关电源芯片型号大全
74HC04芯片引脚图及功能、应用电路图讲解
CR6842芯片参数、引脚配置、应用电路图详解
微信公众号
抖音公众号
浙公网安备 33010502006866号 浙ICP备10014259号-119
营业执照ICP证
数据手册
如果您发现信息不准确，
