3.8 Battery Charging Block Interface
The ISL9221 is a high performance battery charger designed to charge single cell Li-Ion/Li-Poly
batteries with up to 500mA of current from an external power source. It is a stand-alone charging
solution, with just one external component required for complete functionality.
The ISL9221 precisely regulates battery charge voltage and current for 4.2V Li-Ion/Li-Poly battery
cells. The ISL9221 has four basic modes for the battery charge cycle: preconditioning/trickle charge;
constant current/fast charge; constant voltage; and end of charge.
- 28 -
3. HW Circuit Description
LGE Internal Use Only
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
Figure 3-6. SIM CARD Interface
100K
R301
V_IO
33K
R306
5.6K
R303
16K
R304
R305
DNI
0.1uF
C306
5
_EN
_PPR
3
VCHG_IN
VBUS_IN
11
BAT
GND
8
IMIN
6
7
IUSB
9
IVDC
PGND
13
USB_BYP
10
1
VDC
12
VDC_BYP
VUSB
2
4
_CHG
U300
ISL9221
R307
DNI
VCHG
VBUS
C305
0.1uF
0.1uF
C304
VBAT
EOC
CHG_EN