Power Management - LG -A230 Service Manual

3.2 Power Management

A mobile platform requires different 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. For advanced features additional off chip power supplies might be necessary.
Figure. 3-2-1 Block Figure of the PMU Modules X-GOLD™ 215
DC/DC Step Down Converter for 1.8V (SD1)
The DC/DC converter generates a 1.8 V 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 1.8 V memory is used. The efficiency of the DC/DC converter is optimized for an
average load current of 100 mA. That is the load current estimated for the GSM talk mode.
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3. TECHNICAL BRIEF
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