LG KG270 Service Manual - Page 29

Battery Charging Block Interface - charging solution

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3. TECHNICAL BRIEF 3.8 Battery Charging Block Interface CHARGING IC 2V8_VIO VCHARGE VBAT VCHARGE R118 NA U101 CHARGE_DETECT R119 1.8K 1 VIN VBAT 10 C125 R120 2 _FAULT VSEN_TEMP 9 1u NA CHG_STATUS R121 3 _STATUS 8 IREF (10V,K,X5R) R122 0 (10V,K,X5R) NA C126 4 TIME V2P8 7 1u C127 0.015u 5 GND 11 PGND EN 6 C128 R124 R123 NA R125 ISL9201IRZ-T 1u 160K 100K (1%) CHG_EN_TEST CHG_EN Figure 3-8. Charging IC Interface 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 lithiumion/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. - 30 -

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3.8 Battery Charging Block Interface
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.
3. TECHNICAL BRIEF
- 30 -
Figure 3-8. Charging IC Interface
(10V,K,X5R)
CHARGING IC
(1%)
(10V,K,X5R)
1u
C126
2V8_VIO
VCHARGE
NA
R120
NA
R118
1.8K
R119
0.015u
C127
160K
R124
VBAT
1u
C125
NA
R123
R125
100K
R121
NA
2
_FAULT
_STATUS
3
6
EN
GND
5
8
IREF
11
PGND
TIME
4
7
V2P8
10
VBAT
VIN
1
VSEN_TEMP
9
U101
ISL9201IRZ-T
0
R122
C128
1u
VCHARGE
CHG_EN_TEST
CHG_STATUS
CHG_EN
CHARGE_DETECT