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LED_CA1
LED_CA2
LED_CA3
C416
C417
33p
33p
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.
Copyright © 2010 LG Electronics. Inc. All right reserved.
Only for training and service purposes
Charge Pump
VBAT
NC2
15
NC1
10
VOUT
20
LED1
19
LED2
18
LED3
17
LED4
16
C418
C414
C415
33p
1u
33p
C412
1u
Figure 3.10.2 Charge Pump CIRCUIT DIAGRAM
3. TECHNICAL BRIEF
VHP
VIO VBAT
C457
1u
R417
100K
ENA
9
AVIN
13
PVIN
U400
6
SDA
8
SCL
7
C413
2.2u
C411
1u
- 45 -
3. TECHNICAL BRIEF
I2C_SDA2
I2C_SCL2
C410
2.2u
LGE Internal Use Only
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