Panasonic KX-TG7731S Service Manual page 14

KX-TG7731S/KX-TG7732S/KX-TG7733S/KX-TGA470S
4.6.6. 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:
+5.5V
+5.5V
AC Adaptor
+3.0V
IC302
+3.0V
3.0V
REGULATOR
Q301
Q302
IC751
VBAT
VDDC (1.2 V)
Reset (RSTN)
(IC501_77pin)
Startmonitor
(IC501 57pin)
(CKM/STM)
VDD3
IC501
+3.0V_CP
VDD1
BBIC
+3.0V_CP2
+1.8V
VDD2
+2.4V
RF Part
LEDs
IC721
Bluetooth
unit
BBIC chip initialize
14
VDD4
IC502
QSPI FLASH
VDD5
IC601
TAM FLASH
IC611
EEPROM