Charging Circuit - LG KC560 Service Manual

3.14.2. Microphone circuit
MAIN_MIC_P
MAIN_MIC_N

3.15. charging circuit

ISL9221 accepts two power inputs, normally one from a USB (Universal Serial Bus) port and the other
from a desktop cradle.
The ISL9221 features 28V and 7V maximum voltages for the cradle and the USB inputs respectively.
Due to the 28V rating for the cradle input, low-cost, large output tolerance adapters can be used safely
2V62_VIO
_EOC
CHG_EN
R242
100K
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
L100 100nH
L101 100nH
L102 100nH
VMIC_P
27p C103
27p
C102
VMIC_N
Figure 22 Microphone circuit
2V62_VIO
VUSB_USB VCH G
_PPR
C653 C654
R243
1u 1u
Figure 23 charging circuit
C104
1u
U204 ISL9221
13
PGND
1
VDC
12
VDC_BYP
2
VUSB
11
BAT
3
_PPR
10
USB_BYP
4
_CHG
9
IVDC
5
_EN
8
GND
6
IMIN
7
IUSB
5.1K
- 45 -
3. TECHNICAL BRIEF
1
OUT
2
G1
3
G2
4
G3
5
PWR
6
G4
MIC100
SPM0204LE5-QB
VB AT
OVP_ VCH G
OVP_VUSB
R246 R244
R247
18K 15K
1u
(1%) (1%)
LGE Internal Use Only
.