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3. TECHNICAL BRIEF
LGE Internal Use Only
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
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
Figure 19. Charging Circuit Diagram
(1%)
(1608,25V,K,X5R)
(1005,10V,K,X5R)
(1005,10V,K,X5R)
(1005,10V,K,X5R)
(1%)
CHARGING IC OVP
(1%)
(1608,25V,K,X5R)
C213
1u
1
VDC_BYP
12
2
VUSB
_CHG
4
_EN
5
3
_PPR
BAT
11
8
GND
6
IMIN
IUSB
7
IVDC
9
13
PGND
10
USB_BYP
VDC
ISL9221U201
VCHG_OVP VBUS_OVP
VBUS_USB
C210
1u
VCHG
C211
1u
2V62_VIO
100K
R209
2V0_VRTC
R226
DNI
R216
33K
R213
10K
1u
C212
100K
R215
VBAT
R214
16K
C209
1u
CHG_EN
EOC