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LGE Internal Use Only
Copyright © 2010 LG Electronics. Inc. All right reserved.
Only for training and service purposes
3. TECHNICAL BRIEF
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3.11 LCD Backlight Illumination
The RT9367C is an integrated solution for backlighting and phone camera input supply. The part contains a
charge pump white LED driver and dual low dropout linear regulators. This IC can be shut down by pulling
EN low. In the section of charge pump, The RT9367C can power up 4 white LEDs with regulated constant
current for uniform intensity. Each channel (LED1-LED4) can support up to
25mA. The part maintains highest efficiency by utilizing a x1/x1.5/x2 fractional charge pump and low
dropout current regulators. An internal 5-bit DAC is used for brightness control. Users can easily configure up
to 32-step of LED current by I2C interface. In the section of linear regulator, The RT9367C comprises a dual
channel, low noise, and low dropout regulator sourcing up to 300mA at each channel. The range of output
voltage can be configured from 1.1V to 3.3V by I2C interface. The outputs of LDO offer 3% accuracy and low
dropout voltage of 250mV @ 300mA. The LDO also provides current limiting and output short circuit thermal
folded back protection.
[Figure 3.11-1] Circuit Diagram
2.2u
C600
RT9367C
EUSY0344402
U600
12
20
19
18
8
7
6
5
9
4
10
3
11
2
21
1
13
41
15
16
17
LED3
LED4
NC2
2
O
DL
AVIN
N1
C
1
O
DL
N2
C
D
N
G
A
D
N
G
P
NC1
P2
C
ENA
P1
C
PVIN
SCL
SDA
LED2
LED1
VOUT
G_
G
UL
S
VBAT
C603
2.2u
R605
100K
C606
1u
1u
C605
C604
1u
1u
C602
VBL_LDO_2V8
VBAT
LCD_I2C_SCL
LCD_I2C_SDA
LCD_BL_CTRL
LCD_LED_CA1
LCD_LED_CA2
LCD_LED_CA3
VLCD1 MAX 300mA
VLDO2 MAX 300mA
1.1 - 3.3V
1.1 - 3.3V
Содержание LG-S310
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