Panasonic KX-TG9581B Service Manual page 12

KX-TG9581B/KX-TG9582B/KX-TGA950B
4.2.2.4. Power supply(3.0V) :VDD2
This power supply is for Memory IC(IC602, IC603, IC604) and LCD-module and so on.
It consists of BBIC IC601 and Q607.
VBAT steps up to VDD6(3.4V) by IC601 and IC905. After that it gets VDD2(3.0V).
Because it is to use Battery supply at power failure.
4.2.2.5. Power supply(4.0V) :VDD7
This is a power supply for LCD back light.
It conststs of IC601 and Q911.
LDO_CTRL
T10
LDO_IO_CTRL
V11
LDO_IO_FB
M_+1.8V
L3
AVD
E9
VDD1
IC601
P9
VDD2
L14
VDD3
A3
GND3
B4
GND4
C4
GND5
B5
GND6
C5
GND7
F5
GND8
G5
GND9
VBAT
+3.4V
IC905
VDD6
L902
6.8u
1V Reference
GND
VBAT
Q911
L966
10u
0.5V Reference
MASTER
DC2_SENSE
T1
DC2_I
R3
DC2_CTRL
P3
M_+3.0V
VDD2
Q607
IC601
MASTER
DC2_SENSE
T1
DC2_I
R3
DC2_CTRL
P3
NC21
DC_SENSE NC20
T2
DC_I NC19
U1
DC_CTRLn NC18
T3
DC_CTRL NC17
U2
NC16
+4.0V
VDD7
IC601
12
+3.4V
M16
U18
R17
T18
N16
T17