3. TECHNICAL BRIEF
- 45 -
Copyright © 011 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
ͽͶ͑ͺΟΥΖΣΟΒΝ͑ΆΤΖ͑ΟΝΪ
[_VX[^
The RT9396 is a power management IC (PMIC) for backlighting and phone camera applications. The PMIC
contains a 6-Channel charge pump white LED driver and four low dropout linear regulators.
The charge pump drives up to 6 white LEDs with regulated constant current for uniform intensity. Each
channel (LED1 to LED6) supports up to 25mA of current. These 6-Channels can be also programmed as 4
plus 2-Channels or 5 plus 1-Channels with different current setting for auxiliary LED application.
The RT9396 maintains highest efficiency by utilizing a x1/ x1.5/ x2 fractional charge pump and low
dropout current regulators. An internal 6-bit DAC is used for backlight brightness control. Users can easily
configure up to 64-steps of LED current via the I2C interface control.
The RT9396 also comprises low noise, low dropout regulators, which provide up to 200mA of current for
each of the four channels. The four LDOs deliver 3% output accuracy and low dropout voltage of 200mV @
200mA.
Users can easily configure LDO output voltage via the I2C interface control. The LDOs also provide current
limiting and over-temperature functions. The RT9396 is available in a WQFN-24L 3x3 package.
Figure 3-9-2. RT9396 CIRCUIT DIAGRAM
3. TECHNICAL BRIEF
C329
1u
2.2u
C327
2.2u
C335
2.2u
C328
FM_LNA_EN_1
CAM_IO_1V8
CAM_D_1V8
CAM_A_2V8
U302
24
23
22
21
20
19
18
8
7
6
5
9
4
10
3
11
2
12
1
31 41 51 61 71
L
C
S
A
D
S
N
E
M
W
P
F
C
D
N
G
P
LDO1
N2
C
LDO2
N1
C
LDO3
P1
C
LDO4
P2
C
AGND
VIN
LDOIN
LED6
LED5
LED4
LED3
LED2
LED1
VOUT
C324
1u
C325
1u
VBAT
C326
2.2u
C336
1u
0.1u
C330
R318
100K
I2C_SCL
I2C_SDA
MLED1
MLED3
MLED2
LCD_BL_CTRL
MLED4
MLED5
LED_PWM
CHARGE PUMP