Charging Circuit; Only For Training And Service Purposes - LG KS360 Service Manual

3.16 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.
An over voltage protection functions are integrated in ISL9221 for USB & Charge
2V0_VRTC
EOC
CHG_EN
Copyright © 2008 LG Electronics. Inc. All right reserved.

Only for training and service purposes

CHARGING IC OVP
2V62_VIO VBUS_USB VCHG
1
2
3
4
5
6
C209 C210
1u 1u
(1%)
Figure 19. Charging Circuit Diagram
3. TECHNICAL BRIEF
U201 ISL9221
13
PGND
VDC
12
VDC_BYP
VUSB
11
BAT
_PPR
10
USB_BYP
_CHG
9
IVDC
_EN
8
GND
IMIN
7
IUSB
(1%)
(1%)
- 49 -
VBAT VCHG_OVP VBUS_OVP
C211 C212 C213
1u 1u 1u
LGE Internal Use Only