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Linear voltage Regulators (low drop out) LDOs
The LDOs are used to generate the supply for the different supply domains not directly supplied out of the
DC/DC converter.
RF LDO (VRF)
The RF LDO is a linear regulator that could source 200mA (max) with 2.8V output voltage. It
supplies the RF circuitry of the handset. The LDO is optimized for high performance and
adequate quiescent current.
Digital IO LDO (VIO18, VIO28)
The digital IO LDO is a linear regulator that could source 200mA (max) with 2.8V output
voltage. It supplies the the power for baseband circuitry of the SoC.
Analog LDO (VA)
The analog LDO is a linear regulator that could source 150mA (max) with 2.8V output voltage.
It supplies the analog sections of the SoC. The LDO is optimized for low frequency ripple
rejection in order to reject the ripple coming from the burst at 217Hz of RF power amplifier.
TCXO LDO (VTCXO)
The TCXO LDO is a linear regulator that could source 40mA (max) with 2.8V output voltage.
It supplies the temperature compensated crystal oscillator, which needs ultra low noise supply
with very good ripple rejection.
Single-Step RTC LDO (VRTC)
The single-step RTC LDO is a linear regulator that can charge up a capacitor-type backup coin
cell to 2.8V, which also supplies the RTC module even at the absence of the main battery. The
single-step LDO features the reverse current protection and is optimized for ultra low quiescent
current while sustaining the RTC function as long as possible.
Memory LDO (VSF)
The memory LDO is a linear regulator that could source 50mA (max) with 1.8V or 3V
output voltage selection based on the supply Serial flash memory
SIM LDO (VSIM1,2)
The SIM LDO is a linear regulator that could source 100mA (max) with 1.8V or 3.0V output
LGE Internal Use Only
LGE Internal Use Only
Copyright © 2012 LG Electronics. Inc. All right reserved.
15
O nly for training and service purposes
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Copyright © 01 LG Electronics. Inc. All right reserved.
3. TECHNICAL BRIEF
3. TECHNICAL BRIEF
Only for training and service purposes
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