Panasonic G600 Technical Manual page 38

NOTE:
During charging, the voltage could rise as high as 9.4V and all circuitry connected to the battery must be
designed to operate up to this voltage.
A block diagram for a four cell power supply is shown in figure 2 below, note that the battery voltage is stepped-up
to power 5V SIM cards or the 5V RF power amplifier. This circuit also shows a Power-On-Reset (POR) to hold the
CPU in a reset state while the supply voltage and system clock stabilize.
External Power
9.2V 400mA
Battery
Li-ION:7.2V, Ni-MH:4.8V
Figure 2: Power supply block diagram
MCUK980101G8
Technical Guide
http://cxema.ru
EXT PWR
VBAT
LV1
Charge IC
CPU (Gemini)
VDD
5.5V Step-up Reg
3.4V Step-down Reg
DC OUT
RESET
Section 9
9 - 5
POWER SUPPLIES
D5V
5V Reg
SIM Power
SIM 5V
RF:1st VCO, APC circuit
D3V
3V Reg
Logic Digital part
A3V
3V Reg
Logic Analogue part
DC OUT
RF: RX.TX 2nd VCO Synth
VBAT
RF: PA
2.7V Det
600-1002
Issue 1
Revision 0