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AAT2823 데이터시트 PDF




Advanced Analogic Technologies에서 제조한 전자 부품 AAT2823은 전자 산업 및 응용 분야에서
광범위하게 사용되는 반도체 소자입니다.


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부품번호 AAT2823 기능
기능 (AAT2822 - AAT2825) TFT-LCD DC-DC Converter
제조업체 Advanced Analogic Technologies
로고 Advanced Analogic Technologies 로고


AAT2823 데이터시트 를 다운로드하여 반도체의 전기적 특성과 매개변수에 대해 알아보세요.




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AAT2823 데이터시트, 핀배열, 회로
SystemPowerTM
PRODUCT DATASHEET
AAT2822/23/24/25www.DataSheet4U.com
TFT-LCD DC-DC Converter with WLED Driver and VCOM Buffer
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 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%.
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.
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.
The high slew rate operational amplifier is suitable for
VCOM buffering and gain adjustment.
The sequencing of the power supplies ensures proper
panel startup and avoid damage to the device.
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.
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
Applications
• Automotive Displays
• Digital Photo Frames
• Netbooks
• PNDs
2822.2010.02.1.0
www.analogictech.com
1




AAT2823 pdf, 반도체, 판매, 대치품
SystemPowerTM
PRODUCT DATASHEET
AAT2822/23/24/25www.DataSheet4U.com
TFT-LCD DC-DC Converter with WLED Driver and VCOM Buffer
Pin Configurations
AAT2822
TQFN44-24
(Top View)
AAT2823
WLX 1
PGND2 2
REF 3
FBN 4
WEN 5
DRVN 6
18 OUT
17 OP-
EP
16 OP+
15 OPIN
14 FB
13 COMP
WLX 1
PGND2 2
REF 3
FBN 4
WEN 5
DRVN 6
18 N/C
17 N/C
EP
16 N/C
15 N/C
14 FB
13 COMP
AAT2824
N/C 1
PGND2 2
REF 3
FBN 4
GND 5
DRVN 6
18 OUT
17 OP-
EP
16 OP+
15 OPIN
14 FB
13 COMP
AAT2825
N/C 1
PGND2 2
REF 3
FBN 4
GND 5
DRVN 6
18 N/C
17 N/C
EP
16 N/C
15 N/C
14 FB
13 COMP
4
www.analogictech.com
2822.2010.02.1.0

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AAT2823 전자부품, 판매, 대치품
SystemPowerTM
PRODUCT DATASHEET
AAT2822/23/24/25www.DataSheet4U.com
TFT-LCD DC-DC Converter with WLED Driver and VCOM Buffer
Electrical Characteristics
VIN = 5V, EN = WEN = WDIM = VIN, VAVDD = VDD = 12V, TA = -40oC to 85oC unless otherwise noted. Typical values are at
TA = 25oC.
Symbol Description
WLED Driver (AAT2822, AAT2823 Only)
VLED
Output Voltage
IOUT
VFB/
VIN
RDS(ON)
VWFB
Maximum Continuous Output Current
Line Regulation
Low Side Switch On-Resistance
WFB Pin Regulation
TSS Soft-Start Time
VOVP
Over-Voltage Protection Threshold
OVHYS
Over-Voltage Hysteresis
ILIMIT
N-Channel Current Limit
FPWM
Maximum WDIM PWM Frequency
DCMIN
Minimum Duty Cycle
VCOM Buffer (AAT2822 , AAT2824 Only)
VOPIN
IOPIN
VOS
VCM
Supply Range
Supply Current
Input Offset Voltage
Input Common-Mode Range
VOH Output Voltage Swing, High
VOL Output Voltage Swing, Low
ISC Short-Circuit Current
GBW
SR
Logic
WDIM/
WENL/ENL
WDIM/
WENH/ENH
IEN
Gain Bandwidth Product
Slew Rate
Enable Input Low Voltage
Enable Input High Voltage
WDIM/WEN/EN Input Current
Conditions
VLED = 28V
VIN = 2.5V to 5.5V
From Enable to Output Regulation;
VFB = 300mV
VLED Rising
VLED Falling
(VNEG, VPOS, VOUT) VSUP/2
IOUT = 5mA
IOUT = -5mA
VSUP/2
Source
Sink
VIN = 2.5V
VIN = 5.5V
Min Typ Max Units
VIN -
VDIODE
0.282
0.55
1.3
5
50
0.7
300
0.3
300
0.60
25
28
0.318
0.65
1
V
mA
%/V
mΩ
V
μs
V
mV
A
kHz
%
4.5 13.2
1.5 2.5
12
0
VSUP -
150
VSUP
150
75
75
12
13
V
mA
mV
V
mV
mV
mA
MHz
V/μs
0.4 V
1.4 V
1 μA
2822.2010.02.1.0
www.analogictech.com
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