DATA SHEET
AAT2822/2823/2824/2825
TFT-LCD DC/DC Converter with WLED Driver and VCOM Buffer
VLED+(MAX)
VLED+(MAX)
0.6V
Eq. 4: R4 = R5 ·
-1 = 10kΩ ·
0.3V
-1
V
OVP
VWFB(MAX)
ILED(MAX)
Eq. 5: R8 =
=
ILED(MAX)
WLED-
VIN
10V C1
4.7μF
VIN-WLED
HF-PWM
R20
0Ω
J3
VIN
R1
0Ω
adj
R22
R23
open
WFB
10V C2
R8
open
0.1μF
R21
0Ω
C25
open
C4
PWM
OVP
17.4kΩ
R12
OVP
10μF
16V
C9
8nF
AGND
R5
10kΩ
L2
2.2μH
0.6V
WLX
R4
adj
U1
D2
WLED+
1
2
3
4
5
6
18
17
16
15
14
13
C5
WLX
N/C
N/C
N/C
N/C
FB
2.2μF
50V
PGND2
REF
1.2V
FBN
AAT2823
0.22μF
6.3V
C7
R10
6.04kΩ
FBN
0.6V
R2
Adj
WEN
DRVN
R11
COMP
0V
VGL (negative)
R3
6.04kΩ
200kΩ
R9
Adj
C8
100pF
C3
L1
2.2μH
10μF
LX
DRVN
10V
D1
VAVDD
VIN
VDD
A2
C6
C23
0.1μF
25V
22μF
J2
25V
2
1
5
4
WEN
C12
0.6V R6
Adj
VIN
6
3
C26
FBP
0.1μF
25V
C18
0.22μF
25V
J1
J4
10pF
stage 2
EN
R7
6.04kΩ 25V
C13
DRVP
R18
VIN
VIN
open
A1
0.1μF
50V
C19
0.22μF
50V
C10
BAT54SDW
A3
R19
0Ω
3
4
VDD
VAVDD
AVDD
0.1μF
25V
J5
J6
2
1
5
4
5
1
2
stage 3
stage4
C16
C14
C11
stage2
J8
6
3
6
0.22μF
25V
0.1μF
50V
0.1μF
50V
C20
0.22μF
50V
C17
0.22μF
50V
C15
BAT54SDW
A4
0.1μF
50V
C21
0.22μF
50V
C27
stage3
stage4
BAT54SDW
J9
3
6
4
5
1
2
0.1μF
50V
C29
0.22μF
50V
C28
J10
0.1μF
50V
VGH (positive)
C30
0.22μF
50V
BAT54SDW
Figure 7: AAT2823IBK Evaluation Board Schematic.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
23
202081B
• Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • August 2, 2012
AAT [ ADVANCED ANALOG TECHNOLOGY, INC. ]
