Table of Contents
Advertisement
BACKLIGHT CHARGE PUMP
MLED1
MLED2
MLED3
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.
Copyright © 2010 LG Electronics. Inc. All right reserved.
Only for training and service purposes
CAM_AVDD
NC2
15
NC1
10
VOUT
RT9367C
20
LED1
U301
19
LED2
18
LED3
17
LED4
16
C327
1u
C323
1u
Figure 3-9-2. RT9367C CIRCUIT DIAGRAM
48/136
- 49 -
3. TECHNICAL BRIEF
3. TECHNICAL BRIEF
CAM_IOVDD
CAM_DVDD
R334
FB301
0
1000
VBAT
C305
C324
2.2u
2.2u
ENA
9
AVIN
13
FB306
1000
PVIN
6
SDA
8
SCL
7
R313
C302
C308
100K
1u
2.2u
C325
1u
SWIF
I2C_SDA
I2C_SCL
LGE Internal Use Only
Advertisement
Table of Contents
