AAT2557
500mA Battery Charger and 300mA
LDO Regulator for Portable Systems
Typical Characteristics – Battery Charger
Constant Charging Current
vs. Set Resistor Values
Charging Current vs. Battery Voltage
(VADP = 5V)
600
500
400
300
200
100
0
1000
100
10
RSET = 3.24kΩ
RSET = 5.36kΩ
RSET = 8.06kΩ
RSET = 31.6kΩ
RSET = 16.2kΩ
1
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)
End of Charge Battery Voltage
vs. Supply Voltage
End of Charge Voltage Regulation
vs. Temperature
(RSET = 8.06kΩ)
4.206
4.204
4.202
4.200
4.198
4.196
4.194
4.23
4.22
4.21
4.20
4.19
4.18
4.17
RSET = 8.06kΩ
RSET = 31.6kΩ
4.5
4.75
5
5.25
5.5
5.75
6
6.25
6.5
-50
-25
0
25
50
75
100
VADP (V)
Temperature (°C)
Constant Charging Current vs.
Supply Voltage
Constant Charging Current vs. Temperature
(RSET = 8.06kΩ)
(RSET = 8.06kΩ)
210
208
205
203
200
198
195
193
190
220
210
200
190
180
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)
VADP (V)
6
2557.2007.06.1.0
ANALOGICTECH [ ADVANCED ANALOGIC TECHNOLOGIES ]
