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CAM_IO_1V8
CAM_D_1V8
C336
C328
1u
2.2u
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.
LGE Internal Use Only
CAM_A_2V8
FM_LNA_EN_1
VBAT
C335
C327
C326
2.2u
2.2u
2.2u
Figure 3-9-2. RT9396 CIRCUIT DIAGRAM
C325
1u
C324
1u
6
24
AGND
VOUT
7
23
VIN
LED1
U302
8
22
LDOIN
LED2
9
21
LDO4
LED3
10
20
LDO3
LED4
11
19
LDO2
LED5
12
18
LDO1
LED6
R318
C330
100K
0.1u
- 45 -
Copyright © 011 LG Electronics. Inc. All right reserved.
3. TECHNICAL BRIEF
3. TECHNICAL BRIEF
CHARGE PUMP
MLED1
MLED2
MLED3
MLED4
MLED5
C329
1u
I2C_SCL
I2C_SDA
LCD_BL_CTRL
LED_PWM
Only for training and service purposes
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