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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
ͽͶ͑ͺΟΥΖΣΟΒΝ͑ΆΤΖ͑ΟΝΪ
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The RT9396 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 RT9396 can power up 5 white LEDs with regulated constant current
for uniform intensity. Each channel (LED1-LED5) 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 RT9396 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. RT9396 CIRCUIT DIAGRAM
3. TECHNICAL BRIEF
1u
C401
1u
C402
R427
100K
0.1u
C418
2.2u
C419
1u
C433
C420
1u
1V8_HPVDD
2.2u
C421 C422
2.2u
VBAT
324C
u
1
424C
u1
U402
24
23
22
21
20
19
18
8
7
6
5
9
4
10
3
11
2
12
1
31
4
1
51
61
7
1
LCS
ADS
NE
MWP
FC
DNGP
LDO1
N2C
LDO2
N1C
LDO3
P1
C
LDO4
P2C
AGND
VIN
LDOIN
LED6
LED5
LED4
LED3
LED2
LED1
VOUT
1V8_VDD
K
0
1
344R
CAM_A_2V8
CAM_D_1V5
CAM_IO_1V8
I2C_SCL
I2C_SDA
LCD_BL_CTRL
MLED5
MLED4
MLED3
MLED2
MLED1