Panasonic KX-TG2853BXS

12
KX-TG2853BXS/KX-TG2854BXS/KX-TGA280BXS
4.4.2. Power Supply Circuit
Circuit Operation:
When power on the handset, the voltage is as follows;
BATTERY (2.2 V ~ 2.6 V: J1) → L502 → L300, D300 → Q300 (3.4 V) → Q302 (1.8 V), Q301 (2.5 V)