Power Distribution - Nokia 2608 Service Manual

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 o
T he PM 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:
PM
RF PA
Vibrator
Keyboard , Electric torch light& LCD backlights
The heart of the power distribution is the power control block inside the PM. It includes all the voltage
regulators and feeds the power to the entire system. The PM handles hardware power-up functions so that the
regulators are not powered on and the power up reset (PURX) is not released if the battery voltage is less than
3 V.
The baseband is powered by the following PM regulators:
Regulator Rating Current
MSMC
MSMA
MSMP
RUIM
TCXO
Note: All output regulators voltage accuracy +/-2%
Below table includes the PM regulators for the RF.
Regulator Rating Current
RFRX1
RFRX2
RFTX
Note: All output regulators voltage accuracy +/-2%
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f 870 mAh and safety and protect
Table 1 Baseband Regulators
Voltage
300 mA 1.3 V
150 mA 2.60 V
300 mA 2.60 V
150 mA 2.85 V
50 mA 2.85 V
Voltage
150 mA 2.60 V
150 mA 2.60 V
150 mA 2.60 V
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Notes
Always enabled except during power-off mode
Enabled only when the system is powered on (Off during
sleep and power-off modes)
Always enabled except during power-off mode
Enabled only when RUIM card is used
Enabled only when the system is powered on (Off during
sleep and power-off modes)
Table 2 RF Regulators
Notes
Enabled when the receiver is on
Enabled when the receiver is on
Enabled when the transmitter is on
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ion circuits.
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