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LGE Internal Use Only
Copyright © 01 LG Electronics. Inc. All right reserved.
Only for training and service purposes
3. TECHNICAL BRIEF
3. TECHNICAL BRIEF
Figure 3-9-2. RT9396 CIRCUIT DIAGRAM
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
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
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provide current limiting and over-temperature functions. The RT9396 is available in a
WQFN-24L 3x3 package.
U601
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
VPROX_3V0
VTOUCH_3V0
VCAM_DIG_1V8
10
6
B
F 01
VCAM_IO_1V8
R620
0
C619
1u
0
R619
0
R608
0
R609
2.2u
C610
C604
1u
C605
2.2u
VCAM_ANA_2V8
1u
C608
1u
C609
C611
1u
1u
C601
C602
1u
VBAT
100K
R611
LCD_LED_CA5
LCD_LED_CA4
LCD_LED_CA3
LCD_LED_CA2
LCD_LED_CA1
LCD_PWM
I2C_SDA
I2C_SCL
BACKLIGHT_KEY
LCD_BL_CTRL