LG GX300 Service Manual page 52

The RT9367C is a high efficiency charge pump LED driver using Semtech's proprietary mAhXLifeTM
technology. Performance is optimized for use in single-cell Li-ion battery applications.
The charge pump provides backlight current in conjunction with four matched current sinks. The load
and supply conditions determine whether the charge pump operates in 1x, 1.5x, or 2x mode. An optional
fading feature that gradually adjusts the backlight current is provided to simplify control software. The
RT9367C also provides two low- dropout, low-noise linear regulators for powering a camera module or
other peripheral circuits.
The RT9367C uses the proprietary SemWireTM single wire interface. The interface controls all functions of
the device, including backlight current and two LDO voltage outputs. The single wire implementation
minimizes microcontroller and interface pin counts.
In sleep mode, the device reduces quiescent current to 100 A while continuing to monitor the serial
interface. The two LDOs can be enabled when the device is in sleep mode. Total current reduces to 0.1 A
in shutdown.
Copyright © 2010 LG Electronics. Inc. All right reserved.
Only for training and service purposes
Figure 3.10.2. RT9367C CIRCUIT DIAGRAM
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3. TECHNICAL BRIEF
3. TECHNICAL BRIEF
LCD_BL_EN
LGE Internal Use Only