LG GX500 Service Manual page 41

3. TECHNICAL BRIEF
GX500 Operational Description
3.3.2 S-Gold Radio Part
3.3.2.1 General Description
S-GOLDradio integrates a Power Management Unit for Lithium-Ion battery driven applications that require
different power rails. The S-GOLDradio PMU provides two fully integrated, highly efficient, step-down
converters for the main loads such as cores and memories. Both step-down converters support low power
modes (PFM) for maximum efficiency at all times, the output voltages are stable under all load conditions.
For supply voltages higher than the battery voltage, the S-GOLDradio PMU provides a step-up converter. This
step-up converter provides the supply voltage to, for example, serial connected LED's used in display
backlight. A number of LDOs are available to provide different supply rails for different needs.
In addition, the S-GOLDradio PMU supports charging of the battery and generates the power-on reset. It also
provides stand-by voltages and supports different low power modes.
Figure 3-6 S-GOLDradio
LGE Internal Use Only
LG Electronics
PMU Block Diagram
TM
See Figure
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