Power Supply Circuit/Reset Circuit - Panasonic KX-TG7841S Service Manual

KX-TG7841/KX-TG7842/KX-TG7843/KX-TG7844/KX-TG7845/KX-TG365SK/KX-TG7871/KX-TG7872/KX-TG7873/KX-TG7874/KX-TG7875/KX-TG385SK/KX-TGA680
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
LCD_BLT (pin59_IC501)
+3.0V
IC302
3.0V
REGULATOR
Q661
VBAT
VDDC (1.2 V)
Reset (RSTN)
(IC501_77pin)
Startmonitor
(IC501 57pin)
(CKM/STM)
VDD3
IC501
+3.0V
VDD1
BBIC
+1.8V
Q301
VDD2
+2.4V
Q302
RF Part
LEDs
IC721
Bluetooth
unit
LCD BLT
BBIC chip initialize
15
VDD4
IC502
+3.0V_CP
QSPI FLASH
D610
IC611
EEPROM
VDD5
IC601
+3.0V_CP2
TAM FLASH
LCD