Panasonic KX-TG4732B Service Manual page 12

KX-TG4732B/KX-TG4733B/KX-TG4734B/KX-TGA470B
4.4.4. Power Supply Circuit/Reset Circuit
The power supply voltage from AC adaptor is converted to VBAT (3.0V) in IC302. And +3.0V for peripherals and analog part is
insulated from VBAT by Doubler of BBIC.
Circuit Operation:
AC Adaptor
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IC302
5.5V
3.0V
REGULATOR
VBAT
VDDC (1.2 V)
Reset (RSTN)
(IC501_54 pin)
Startmonitor
(IC501 57pin)
(CKM/STM)
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VBAT
IC501
VBAT
pin 10
RSTN(Reset)
BBIC
pin 54
STM/CKM
pin 57
pin 9
RF Part
ANS LED
MSG LED
SP LED
LCD BLT
BBIC chip initialize
12
+3.0V
pin 15
DOUBLER OUT
For peripherals
VDDC (1.2V)
IC601
FLASH
IC611
EEPROM
Receive
Amp.