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3. TECHNICAL BRIEF
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LGE Internal Use Only
Copyright © 011 LG Electronics. Inc. All right reserved.
Only for training and service purposes
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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.
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LCORE
The LCORE LDO provides the VCORE supply used for most of the digital parts of the chip
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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.
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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.
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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.
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LMMC
The LMMC generates VMMC. It is a general purpose LDO and can be used e,g. for memory cards
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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.
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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.