LG -A258 Service Manual page 20

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 215
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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