AAT1149 Datasheet, PDF (6/20 Pages) Advanced Analogic Technologies – 3MHz Fast Transient 400mA Step-Down Converter

Typical Characteristics
Switching Frequency Variation vs. Temperature
10
8
6
4
2
0
-2
-4
-6
-8
-10
-40 -20
0
20
40
60
80
Temperature (°C)
100 120
AAT1149
3MHz Fast Transient
400mA Step-Down Converter
Output Voltage Error vs. Temperature
(V_IN = 3.6V; V_O = 1.8V; I_OUT = 400mA)
2.0
1.0
0.0
-1.0
-2.0
-40
-20
0
20
40
60
Temperature (°C)
80
100
Line Regulation
(V_OUT = 3V)
1
0.8
0.6
0.4
0.2
0 _300mA
-0.2
-0.4
600mA
-0.6
-0.8
-1
2.5
3
3.5
1mA
400mA
100mA _0mA
4
4.5
5
5.5
Input Voltage (V)
Line Regulation
(V_OUT = 1.8V)
1
0.8
0.6
400mA
0.4
0.2
0mA
100mA
0
-0.2
-0.4
-0.6 600mA
-0.8
-1
2.5
3
3.5
4
4.5
5
5.5
6
Input Voltage (V)
Line Regulation
(V_OUT = 1.1V)
1
0.8
0.6
0.4 1mA
0.2
0mA
0
-0.2
600mA ^400mA
-0.4
-0.6
-0.8
-1
2.5
3
3.5
4
4.5
5
5.5
6
Input Voltage (V)
Line Transient
(V_OUT = 1.8; 400mA Load; No Feedforward Capacitor)
4.50
1.90
4.25
1.88
4.00
1.86
3.75
1.84
3.50
1.82
3.25
1.80
3.00
1.78
2.75
1.76
2.50
1.74
Time (50µs/div)
6
1149.2006.11.1.0