AAT3681
USB Port or AC Adapter
Lithium-Ion/Polymer Battery Charger
Typical Characteristics
Constant Charging Current
vs. Set Resistor Values
Charging Current vs. Battery Voltage
(AAT3681 Only)
350
1000
RSET = 5.36kΩ
300
250
100
10
1
RSET = 8.06kΩ
200
150
RSET = 16.2kΩ
100
50
RSET = 31.6kΩ
0
2.7
2.9
3.1
3.3
3.5
3.7
3.9
4.1
4.3
1
10
100
1000
VBAT (V)
RSET (kΩ)
Charging Current vs. Battery Voltage
(AAT3681-1 Only)
End of Charge Battery Voltage
vs. Supply Voltage
600
500
400
300
200
100
0
4.206
4.204
4.202
4.200
4.198
4.196
4.194
RSET = 3.24K
RSET = 8.06kΩ
RSET = 31.6kΩ
RSET = 5.36K
RSET = 8.06K
RSET = 16.2K
RSET = 31.6K
4.5
4.75
5
5.25
5.5
5.75
6
6.25
6.5
2.7
2.9
3.1
3.3
3.5
3.7
3.9
4.1
4.3
VBAT (V)
VIN (V)
End of Charge Voltage Regulation
vs. Temperature
Constant Charging Current vs.
Supply Voltage
(RSET = 8.06kΩ)
(RSET = 8.06kΩ)
4.23
220
210
200
190
180
4.22
4.21
4.20
4.19
4.18
4.17
VBAT = 3.3V
VBAT = 4V
VBAT = 3.6V
170
4
-50
-25
0
25
50
75
100
4.25 4.5 4.75
5
5.25 5.5 5.75
6
6.25 6.5
Temperature (°C)
VIN (V)
3681.2007.01.1.2
5
AAT [ ADVANCED ANALOG TECHNOLOGY, INC. ]
