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부품번호 | AAT2823 기능 |
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기능 | (AAT2822 - AAT2825) TFT-LCD DC-DC Converter | ||
제조업체 | Advanced Analogic Technologies | ||
로고 | |||
전체 28 페이지수
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
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
4페이지 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
7
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구매 문의 | 일반 IC 문의 : 샘플 및 소량 구매 ----------------------------------------------------------------------- IGBT, TR 모듈, SCR 및 다이오드 모듈을 포함한 광범위한 전력 반도체를 판매합니다. 전력 반도체 전문업체 상호 : 아이지 인터내셔날 사이트 방문 : [ 홈페이지 ] [ 블로그 1 ] [ 블로그 2 ] |
부품번호 | 상세설명 및 기능 | 제조사 |
AAT2820 | Triple-Output Charge Pump Regulator | AAT |
AAT2822 | (AAT2822 - AAT2825) TFT-LCD DC-DC Converter | Advanced Analogic Technologies |
DataSheet.kr | 2020 | 연락처 | 링크모음 | 검색 | 사이트맵 |