LG C1150 Service Manual page 38

AD6537B
A5
VCHG
A7
ISENSE
A6
GATEDRIVE
T13
KEYOUT KEY_ROW0
R110
T14
KEYON
1K
C123
A10
REFBB
1u
T12
NC_T12
R1
NC_R1
VREF
A16
NC_A16
C16
NC_C16
B15
REF
B14
AFCDAC
B12
PA
B6
BATTYPE
B11
REFOUT
D15 R121
REFCHG
82K
C136 C137
1u 0.1u
In order to reduce time for trickle charging, additional circuit(Pre-charge circuit) was included.
This circuit has supplied a 50mA current into the battery additionally.
So call it, it reduce trickle charging time
VCHARGE
VBAT
C122
CUS02
R107
10K 10u
D101
R108
R109
330
Q103
KB101
4 5
G S
PWR KEY
3 6
D3 D4
2 7
D2 D5
1 8
D1 D6
TPCF8102-TE85L-F
C134 1u
C135 22p
AFC
TX_RAMP
BAT_TEMP
C138 C139
0.068u 39p
Figure 3-20. CHARGING CIRCUIT
- 39 -
3. TECHNICAL BRIEF
VBAT
Current Sense
0.2
1%
CLOSE TO BATTERY PACK
VCHARGE
C109 R101
49.9
0.1u
3
R105
PRE_CHARGE
2
R106
1.5K
100K
1
VBAT
R102
R103
0
1K
UMX1NTN
4
RED_LED
5
6
Q104