Power Supply Circuit/Reset Circuit - Panasonic KX-TGF350N Service Manual

4.6.5.

Power Supply Circuit/Reset Circuit

There are 2 pattern from power supply voltage.
1) AC adapter voltage is converted to VBAT(3.0V) at DCDC converter.
2) Battery voltage goes through to VBAT(Battery voltage).
VBAT is used for various voltage of the system.
Circuit Operation:
+5.5V
AC adapter
Charge
Control
Circuit
Battery
KX-TGF350N/KX-TGF352N/KX-TGF353N/KX-TG572SK/KX-TGF380M/KX-TGF382M/KX-TGF383M/KX-TGFA30N/KX-TGFA30M
VBAT
DCDC
converter
IC302
VBAT
VDD1 (1.8 V)
Reset (RSTN)
(IC501_77pin)
Startmonitor
(IC501 57pin)
(CKM/STM)
VDD3
VDD1
+1.8V
Q301
+1.8V
IC722
for KX-TGF38x only
BBIC chip initialize
15
VDD5
3.0V_CP2
BBIC
VDD4
IC501
3.0V_CP1
IC502
QSPI FLASH
IC601
TAM FLASH
IC421
Sub IC
RF Part
VDD6
4.0V
DCDC
converter
IC721
Bluetooth
unit
LEDs
LCD module