AAT1149 Datasheet, PDF (5/20 Pages) Advanced Analogic Technologies – 3MHz Fast Transient 400mA Step-Down Converter

Typical Characteristics
Efficiency vs. Load Current
(V_OUT = 3V; L = 3µH)
100
V_IN = 3.3V
90
80
70
V_IN = 4.2V _{VIN = 5V}
60
50
0.1
1
10
100
1000
Load Current (mA)
Efficiency vs. Load Current
(V_OUT = 1.8V; L = 2.2µH)
100
90
V_IN = 3V
V_IN = 3.6V
80
V_IN = 2.7V
70
V_IN = 5V
V_IN = 4.2V
60
50
0.1
1
10
100
1000
Load Current (mA)
No Load Quiescent Current vs. Input Voltage
70
60
85°C
50
40
30
-40°C
20
10
0
2.5
3
3.5
4
4.5
5
Input Voltage (V)
25°C
5.5
6
AAT1149
3MHz Fast Transient
400mA Step-Down Converter
1.00
0.75
0.50
0.25
0.00
-0.25
-0.50
-0.75
-1.00
0.1
Load Regulation
(V_OUT = 3V; L = 3µH)
V_IN = 4.2V
V_IN = 5V
V_IN = 3.3V
1
10
100
1000
Load Current (mA)
Load Regulation
(V_OUT = 1.8V; L = 2.2µH)
1.00
0.75
0.50
0.25
0.00
-0.25
-0.50
V_IN = 5V
-0.75
-1.00
0.1
1
V_IN = 3V
V_IN = 4.2V
V_IN = 3.6V
V_IN = 2.7V
10
100
1000
Load Current (mA)
Switching Frequency vs. Input Voltage
2
1
V_OUT = 1.1V
0
-1
-2
-3
V_OUT = 1.8V
V_OUT = 3V
-4
2.5
3
3.5
4
4.5
5
5.5
Input Voltage (V)
1149.2006.11.1.0
5