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Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
3. BB Circuit Technical brief
GD910 service manual
3.8 LCD back-light illumination
SM8158 is high efficiency charge pump LED driver using.
The load and supply conditions determine whether the charge pump operates 1X, 1.5X, or 2X mode.
SM8158 also provides two low-drop out, low-noise linear regulators for powering a camera module or other
peripheral circuits.
Charge-pump
C254
1u
C255
1u
0.1u
C260
2.2u
C244
C256
1u
C510
0.1u
C239
1u
1u
C478
FB1
1u
C240
VBAT_LCD_BL
VGA_DVDD_1V8
17
GPO3
G_SLUG
29
LDOUT1
15
13
LDOUT2
20
LMON
22
PD
PGND
7
SCL
11
SDA
12
10
VIN1
14
VIN2
4
VOUT
23
VREF
C1M
9
C1P
8
C2M
6
5
C2P
CD
21
DIN1
3
2
DIN2
DIN3
1
28
DIN4
26
DIN5
DIN6
25
DIN7
24
GND1
27
16
GND2
GPO1
19
18
GPO2
SM8158BB-G-EL
U201
VBAT_LCD_BL
VGA_AVDD_2V8
2V62_VIO
EN
4
GND
2
PGND
5
3
VIN
1
VOUT
10u
C259
MIC94062YMT
Q303
VGA_IOVDD_2V8
VBAT
1u
C512
MLED3
I2C1_SCL
I2C1_SDA
MLED_OUT
MLED1
MLED2
GD910 service manual
[
Figure 3.8-1] LCD charge pump circuit diagram
Содержание GD910
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