3.10 LCD back-light illumination
The SC654 is a high efficiency charge pump LED driver using Semtech s proprietary charge pump
technology. Performance is optimized for use in single-cell Li-ion battery applications.
- 45 -
3. TECHNICAL BRIEF
LGE Internal Use Only
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
Figure 12 LCD Back light unit and Flash LED charge pump IC
LCD Backlight
VBAT
u
1
2
0
5
C
GND
IN
9
OUTCP
6
PGND
15
4
C1+
5
C1-
C2+
7
C2-
8
11
D1
D2
12
13
D3
14
D4
1
D5
2
D6
EN_SET
3
10
U500
AAT3169IFO- T1
EUSY0336502
u
1
4
0
5
C
u
1
3
0
5
C
0
0
5
C
u
1
4
0
5
R
K
0
0
1
N
E
_
T
H
G
I
L
K
C
A
B
_
D
C
L
1
D
E
L
M
2
D
E
L
M
3
D
E
L
M
4
D
E
L
M
5
D
E
L
M
D
E
L
M
Figure 11 Keypad Back-light LEDs
KEY LED
0
0
2
2
0
M
5
L
V
E
5
0
1
A
V
T
W
H
1
0
4
-
H
S
1
0
1
D
L
6
0
1
R
0
2
1
2
0
1
D
L
T
W
H
1
0
4
-
H
S
0
2
1
7
0
1
R
T
W
H
1
0
4
-
H
S
3
0
1
D
L
VBAT
8
0
1
R
0
2
1
R
_
D
E
L
