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Copyright © 2010 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
3. TECHNICAL BRIEF
ͽͶ͑ͺΟΥΖΣΟΒΝ͑ΆΤΖ͑ΟΝΪ
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 shutdown by pulling
ENA 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 3-9-2. RT9367C CIRCUIT DIAGRAM
3. TECHNICAL BRIEF
48/136
FB306
1000
R334
0
CAM_DVDD
C305
2.2u
RT9367C
U301
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
2.2u
C308
R313
100K
1u
C325
1u
C323
1u
C327
2.2u
C324
1000
FB301
C302
1u
CAM_IOVDD
CAM_AVDD
SWIF
I2C_SDA
I2C_SCL
MLED2
MLED3
MLED1
BACKLIGHT CHARGE PUMP
Содержание LG-A130
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