LG KU950 - Page 55

3.10.5.3 LCD backlight / Flash LED / Camera LDO
U802(MAX8631XETI) is a charge pump and supply a power of mega camera, VGA camera and
camera flash LED. U802 is controlled by GPIOs of MSM6275.
3. TECHNICAL BRIEF
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Figure. Schematic of charge pump
LCD BL/FLASH LED/CAMERA LDOs
Remove Two R 2005.11.24
Remove MLED4 2005.11.24
EUSY0263101
R811 0
C810
10u
4
5
LDO2
16
M1
M2
15
M3
14
13
M4
OUT
25
28
P1
P2
17
24
PGND
1
PIN
6
REFBP
7
SETF
8
SETM
BGND
29
22
C1N
C1P
23
C2N
27
26
C2P
ENF
21
18
ENLDO
20
ENM1
ENM2
19
F1
12
11
F2
10
F3
9
F4
GND
3
IN
2
LDO1
MAX8631XETIU802
R826 15K
VCAM_1.8V
+VPWR
C905
1u
10u
C812
1u
C820
0
R812
R824 100K
100KR823
VCAM_2.8V
1u
C809
R822 100K
C819
0.01u
6.8KR825
1u
C811
FLASH_BL_CPO
LCD_BL_CTRL
FLASH_LED_CTRL
CAM_DUAL_LDO_EN
FLED
MAIN_LED3
MAIN_LED2
MAIN_LED1
MAIN_LED0
WLED_PWR