AAT1121 Datasheet, PDF (6/20 Pages) Advanced Analogic Technologies – 1.5MHz, 250mA Step-Down Converter

AAT1121
1.5MHz, 250mA Step-Down Converter
Typical Characteristics
Soft Start
(V_IN = 3.6V; V_OUT = 1.8V;
I_OUT = 250mA; C_FF = 100pF)
5.0
1.6
4.0
V_EN
1.4
3.0
1.2
2.0
1.0
1.0
0.8
0.0
0.6
-1.0 V_O
0.4
-2.0
0.2
-3.0
0.0
-4.0
I_L
-0.2
-5.0
-0.4
Time (100µs/div)
Line Regulation
(V_OUT = 1.8V)
0.6
0.5
0.4
I_OUT = 0mA
0.3
I_OUT = 50mA
0.2
0.1
I_OUT = 150mA
0.0
-0.1
I_OUT = 10mA
-0.2
I_OUT = 250mA
-0.3
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
Input Voltage (V)
Output Voltage Error vs. Temperature
(V_IN = 3.6V; V_OUT = 1.8V; I_OUT = 250mA)
3.0
2.0
1.0
0.0
-1.0
-2.0
-3.0
-40
-20
0
20
40
60
80
100
Temperature (°C)
Switching Frequency Variation
vs. Temperature
(V_IN = 3.6V; V_OUT = 1.8V)
10.0
8.0
6.0
4.0
2.0
0.0
-2.0
-4.0
-6.0
-8.0
-10.0
-40
-20
0
20
40
60
80
100
Temperature (°C)
Frequency Variation vs. Input Voltage
2.0
1.0 _{VOUT = 1.8V}
0.0
-1.0
-2.0
-3.0
V_OUT = 3.0V
-4.0
2.7
3.1
3.5
3.9
4.3
4.7
5.1
5.5
Input Voltage (V)
No Load Quiescent Current vs. Input Voltage
50
45
40
35 ^85°C
30 25°C
25 _-40°C
20
15
10
2.7
3.1
3.5
3.9
4.3
4.7
5.1
5.5
Input Voltage (V)
6
1121.2006.04.1.0