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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.
Figure 12 LCD Back light unit and Flash LED charge pump IC
Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
KEY LED
VBAT
1 R
6 0
1 R
7 0
1
0 2
1
0 2
L
1 D
1 0
L
1 D
2 0
L
Figure 11 Keypad Back-light LEDs
LCD Backlight
VBAT
U500
4
5 C
3 0
C1+
u 1
5
C1-
9
IN
3
C L
D
B _
C A
L K
G I
H
_ T
N E
EN_SET
10
GND
15
PGND
5 C
0 0
5 R
4 0
AAT3169IFO- T1
u 1
0 1
K 0
EUSY0336502
- 45 -
3. TECHNICAL BRIEF
1 R
8 0
1
0 2
1 D
3 0
L
D E
R _
V
1 A
5 0
V E
5 L
0 M
2 2
0 0
7
5 C
4 0
C2+
u 1
8
C2-
6
OUTCP
L M
D E
11
D1
M
E L
1 D
12
D2
M
E L
2 D
13
D3
M
E L
3 D
14
D4
M
E L
4 D
1
D5
M
E L
5 D
2
D6
5 C
2 0
u 1
LGE Internal Use Only
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Troubleshooting
