AAT2556
Battery Charger and Step-Down
Converter for Portable Applications
Typical Characteristics – Step-Down Converter
Output Voltage Error vs. Temperature
(VIN = 3.6V; VOUT = 1.8V; IOUT = 250mA)
Switching Frequency Variation
vs. Temperature
(VIN = 3.6V; VOUT = 1.8V)
3.0
2.0
10.0
8.0
6.0
1.0
4.0
2.0
0.0
0.0
-2.0
-4.0
-6.0
-8.0
-10.0
-1.0
-2.0
-3.0
-40
-20
0
20
40
60
80
100
5.5
6.0
-40
-20
0
20
40
60
80
100
Temperature (°C)
Temperature (°C)
Frequency Variation vs. Input Voltage
(VOUT = 1.8V)
No Load Quiescent Current vs. Input Voltage
50
45
40
2.0
1.0
0.0
85°C
35
-1.0
-2.0
-3.0
-4.0
30
25°C
25
-40°C
20
15
10
2.7
3.1
3.5
3.9
4.3
4.7
5.1
2.7
3.1
3.5
3.9
4.3
4.7
5.1
5.5
Input Voltage (V)
Input Voltage (V)
P-Channel RDS(ON) vs. Input Voltage
N-Channel RDS(ON) vs. Input Voltage
750
1000
900
800
700
600
500
400
300
700
650
600
550
500
450
400
350
300
120°C 100°C
85°C
120°C
100°C
85°C
25°C
25°C
2.5
3.0
3.5
4.0
4.5
5.0
5.5
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
Input Voltage (V)
Input Voltage (V)
2556.2006.09.1.2
7
AAT [ ADVANCED ANALOG TECHNOLOGY, INC. ]
