Power Supply Circuit - Panasonic KX-TG4763B Service Manual

KX-TG4763B/KX-TGA470B/KX-TGA405B

4.11.3. Power Supply Circuit

The power supply voltage from AC adaptor is converted to VBAT (3.0 V) in IC302. VBAT is used for BBIC and all peripherals.
Circuit Operation:
AC Adaptor
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IC302
6.5V
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
ANT/ID LED
STATUS LED
BBIC chip initialize
24
VDDC (1.2V)
IC611
EEPROM