Model
MASS 2
Version
V_1.0
Prepared by
H/W
Date
22/01/2008
Subject Technical
Manual Page
44/59
The digital IO LDO is a regulator that sources 100 mA (max) with a 2.8 V output voltage. The LDO supplies the
BB circuitry in the handset, and is optimized for a very low quiescent current. This LDO powers up at the same
time as the digital core LDO.
3) Analog LDO (VA)
The analog LDO is a regulator that sources 150 mA (max) with a 2.8 V output voltage. The LDO supplies the
analog sections of the BB chipsets and is optimized for low frequency ripple rejection in order to reject the ripple
coming from the RF power amplifier burst frequency at 217 Hz.
4) TCXO LDO (VTCXO)
The TCXO LDO is a regulator that sources 20 mA (max) with a 2.8 V output voltage. The LDO supplies the
temperature compensated crystal oscillator, which needs its own ultra low noise supply and very good ripple
rejection ratio.
5) RTC LDO (VRTC)
PMIC features a 2-step RTC that keeps RTC alive for a long time after the battery has been removed. The 1st LDO
charges a backup battery on the BAT_BACKUP pin to ~2.6 V. Also, when the battery is removed, the first stage
prevents the backup battery from leaking back to VBAT. The 2nd LDO regulates the 2.6 V supply to a 1.5 V/1.2 V
optional RTC voltage. The RTC voltage can be set by the RTC_SEL pin while the BB is alive.
6) Memory LDO (VM)
The memory LDO is a regulator that sources 150 mA (max) with a 1.8 V or 2.8 V output voltage selection based on
the supply specs of the memory chips. The LDO supplies the memory circuitry in the handset, and is optimized for
a very low quiescent current. This LDO powers up at the same time as the digital core LDO.
7) SIM LDO (VSIM)
The SIM LDO is a regulator that sources 20 mA (max) with a 1.8 V or 3.0 V output voltage selection based on the
supply specs of subscriber identity module (SIM) card. The LDO supplies the SIMs in the handset, and is
controlled independently of the other LDOs.
8) Memory Card LDO (VMC)
The memory card LDO is a regulator that sources 250 mA (max) with a 2.8 V or 3.0 V output voltage selection.
The LDO supplies the memory card (MS, SD, MMC) in the handset, and is controlled independently of the other
LDOs.
9) Auxiliary Analog Circuit LDO (VA_SW)
Содержание MASS2
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