Battery Charging Block Interface - LG 410G Service Manual

3.8 Battery Charging Block Interface

V_IO
EOC
CHG_EN
DNI
R305
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.
Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
VCHG_IN
VBUS_IN
U300
1
VDC
2
VUSB
3
_PPR
4
_CHG
5
_EN
6
IMIN
Figure 3-8. Charging IC Interface
-21-
3. H/W Circuit Description
ISL9221
13
PGND
12
VDC_BYP
11
BAT
10
USB_BYP
9
IVDC
8
GND
7
IUSB
DNI
R307
- 25 -
VBAT VCHG VBUS
C304 C305 C306
0.1uF 0.1uF 0.1uF
LGE Internal Use Only