RM-384
System Module and User Interface
Page 5-22 Company Confidential Issue1
Copyright © 2009 Nokia. All rights reserved.
Power distribution
In normal operation, the baseband is powered by the mobile terminal‘s battery pack. The battery pack consists
of one lithium-ion cell with a capacity of 860 mAh and safety and protection circuits.
The PMIC controls the power distribution to the whole mobile terminal, which includes the baseband and the
RF regulators, but excludes the RF power amplifier (RF PA) RF power amplifier drains power from the battery
directly. The battery provides power directly to the following parts of the system:
PMic
RF PA
Flash LED driver IC
Power Key
Camera driver IC
Audio amplifier
The heart of the power distribution is the power control block inside the PMIC. It includes all the voltage
regulators and feeds the power to the entire system.
The baseband is powered by the following PM regulators:
Regulator
Rating Current Voltage Notes
MSMC
800 mA
1.27 V
Always enabled except during power-off mode
MSMA
300 mA
2.60 V
Enabled only when the system is powered on (Off during
sleep and power-off modes)
MSMP
300 mA
2.60 V
Always enabled except during power-off mode
RUIM
150 mA
3.0 V
Enabled only when RUIM card is used
TCXO
80 mA
2.85 V
Enabled only when the system is powered on (Off during
sleep and power-off modes)
Note: All output regulators voltage ac/-2%
Table 30 Baseband Regulators
Below table includes the PM regulators for the RF.
Regulator
Rating Current Voltage Notes
Note: All output regulators voltage ac/-2%
Table 31 RF Regulators
