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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
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Figure 3-9-2. RT9396 CIRCUIT DIAGRAM
3. TECHNICAL BRIEF
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.
2.2u
C320
2.2u
C321
2.2u
C322
2.2u
C319
FM_LNA_EN
100K
R313
C316
0.1u
1u
C318
1u
C317
VBAT
1u
C323
1u
C324
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
CAM_A_2V8
CAM_D_1V5
CAM_IO_1V8
I2C_SCL
I2C_SDA
MLED1
MLED3
MLED2
LCD_BL_CTRL
MLED4
MLED5
LED_PWM
CHARGE PUMP