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3. TECHNICAL BRIEF
3.12 LCD back light illumination
MAX8630W is a charge pump designed to support PWM control mode. And MAX8630W supports 5
white LEDs. The MAX8630W is capable of driving up to 5 LEDs at a total of 100mA(MAX8630W
100mA).
The current sinks may be operated individually or in parallel for driving higher current LEDs. To
maximize power efficiency, the charge pump operates in 1X, 1.5X, or 2X mode, where the mode of
operation is automatically selected by comparing the forward voltage of each LED with the input
voltage.
LGE Internal Use Only
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LCD BACKLIGHT
C114
0.1u
DNIR114
12
LED3
11
LED4
10
LED5
7
OUT
8
PWM P_GND
15
MAX8630W
U100
C1N
2
6
C1P
C2N
4
5
C2P
9
CPWM
GND
1
IN
3
14
LED1
13
LED2
C115 1u
1u
C104
C103 1u
100K
R116
0R115
C112
C111 9p
C109
9p
9p
C110 9p
C108
C107 9p
VBAT
9p
1u
C113
MLED1
MLED
MLED3
MLED2
MLED5
MLED4
DBB_BL_PWM
LCD_BL_PWM
Figure 13. Charge-Pump Circuit