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3. TECHNICAL BRIEF
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.
The VSIM output current is high enough to drive USB SIM cards.
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.
Other LDOs
The RF module has implemented several LDO's for different RF Power domain.
The mixed signal module has some LDO's for the audio driver and microphone supply.
LGE Internal Use Only
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Copyright © 2011 LG Electronics. Inc. All right reserved.
3. TECHNICAL BRIEF
Only for training and service purposes
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