Battery Charging Block Interface - LG KG270 Service Manual
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- Service manual (125 pages) ,
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3. TECHNICAL BRIEF
3.8 Battery Charging Block Interface
R119
CHARGE_DETECT
CHG_STATUS
(10V,K,X5R)
The AAT3681A is a high performance battery charger designed to charge single Cell
lithiumion/polymer 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 AAT3681A precisely regulates battery charge voltage and current for 4.2V lithium-
ion/polymer battery cells.
The adapter/USB charge input constant current level can be programmed up to 500mA for rapid
charging applications.
The AAT3681A has four basic modes for the battery charge cycle:
pre-conditioning/trickle charge; constant current/fast charge; constant voltage; and end of charge.
LGE Internal Use Only
CHARGING IC
2V8_VIO
VCHARGE
R118
NA
U101
1.8K
1
VIN
2
_FAULT
R121
3
_STATUS
NA
4
C126
TIME
1u
5
GND
C127
11
PGND
0.015u
ISL9201IRZ-T
Figure 3-8. Charging IC Interface
VBAT
VCHARGE
10
VBAT
C125
9
1u
VSEN_TEMP
(10V,K,X5R)
8
IREF
7
V2P8
6
EN
C128
R124
1u
160K
(1%)
Copyright © 2007 LG Electronics. Inc. All right reserved.
- 30 -
R120
NA
R122
0
CHG_EN_TEST
R123
NA
CHG_EN
R125
100K
Only for training and service purposes
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