Power Management - LG GX300 Service Manual

3. TECHNICAL BRIEF

3.3 Power Management

A mobile platform requires power supplies for different functions. These power supplies are generated in
the integrated power management Unit (PMU). The PMU is designed to deliver the power for a typical
standard phone.
Figure. 3-2-1 Block Figure of the PMU Modules X-Gold tm 213
DC/DC Step Down Converter for 1.8V (SD1)
The DC/DC converter generates a 1.8V supply rail. This voltage rail is used to supply main parts of the
system, like the digital core of the chip (via LDO LCORE), some parts of the mixed signal macro, parts of the
RF macro and the external memory if a 1.8V memory is used. The efficiency of the DC/DC converter is
optimized for an average load current of 100mA. That is the load current estimated for the GSM talk mode.
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3. TECHNICAL BRIEF
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