Lcd Back-Light Illumination; Only For Training And Service Purposes - LG KP270 Service Manual

3.11 LCD back-light illumination

SC624 is high efficiency charge pump LED driver using Semtech's proprietary mAhXLife technology.
The load and supply conditions determine whether the charge pump operates 1X, 1.5X, or 2X mode.
SC624 also provides two low-drop out, low-noise linear regulators for powering a camera module or
other peripheral circuits.
BACKLIGHT CHARGE PUMP
C248
4.7u
MLED1
MLED2
MLED3
Copyright © 2008 LG Electronics. Inc. All right reserved.

Only for training and service purposes

VBAT
FB204
C247
1u
C249
1u
1
C2-
2
U204
PGND LDO1
3
SC624ULTRT
NC1 LDO2
4
BL1 BYP
5
BL2 NC3
SWIF
[Figure 3.11-1] LCD charge pump circuit diagram
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3. TECHNICAL BRIEF
1V8_CAMIO
2V8_AVDD
1V8_CAMCORE
FB206
FB205
MLED
C250
C251
2.2u
C252
1u
2.2u
15
14
13
12
11
C259
22n
FB207
2V62_VIO
R232
DNI
MLED_CLDO_CTRL
R231
DNI
LGE Internal Use Only