LG -A258 Service Manual page 21

Linear voltage Regulators (low dropout) LDOs
The LDOs are used to generate the supply for the different supply domains not directly supplied out of the
DC/DC converter.
LCORE
The LCORE LDO provides the VCORE supply used for most of the digital parts of the chip
LPMU
The LPMU provides VPMU sued for the PMU supply, e.g. for the startup state machine and analog parts like
ADC, sense amplifier etc.
LUSB
The LUSB LDO generates the supply for the USB transceiver (output driver and input). If no USB interface is
required, LUSB can be used as general purpose LDO.
LAUX
The LAUX generates VAUX. It is a general purpose LDO and can be used for different functions depending on
the phone application, e.g. for the display or Camera.
LMMC
The LMMC generates VMMC. It is a general purpose LDO and can be used e,g. for memory cards
LSIM
The LSIM LDO generates the VSIM supply for the SIM card and interface. It is designed to supply Standard SIM
cards according ETSI TS 102 221.
Other LDOs
• The RF module has implemented several LDO's for different RF power domains.
• The mixed signal module has some LDO's for the audio driver and microphone supply
• The FM receiver has an internal LDO for sensitive RF circuits.
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