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)
Line Regulation
(V
OUT
= 1.8V)
0.6
0.5
0.4
Enable and Output Voltage
(top) (V)
5.0
4.0
3.0
2.0
1.0
0.0
V
EN
Accuracy (%)
I
OUT
= 0mA
I
OUT
= 50mA
I
OUT
= 150mA
Inductor Current
(bottom) (A)
0.3
0.2
0.1
0.0
-0.1
-0.2
-0.3
2.5
3.0
3.5
0.8
0.6
V
O
I
L
Time (100µs/div)
0.4
0.2
0.0
I
OUT
= 10mA
I
OUT
= 250mA
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
10.0
2.0
1.0
0.0
-1.0
-2.0
-3.0
-40
8.0
Switching Frequency Variation
vs. Temperature
(V
IN
= 3.6V; V
OUT
= 1.8V)
Output Error (%)
Variation (%)
-20
0
20
40
60
80
100
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)
°
Temperature (°C)
Frequency Variation vs. Input Voltage
2.0
No Load Quiescent Current vs. Input Voltage
50
Frequency Variation (%)
Supply Current (µA)
1.0
0.0
-1.0
-2.0
-3.0
-4.0
V
OUT
= 1.8V
45
40
35
30
25
20
15
10
2.7
3.1
3.5
3.9
4.3
4.7
5.1
5.5
85°C
25°C
-40°C
V
OUT
= 3.0V
2.7
3.1
3.5
3.9
4.3
4.7
5.1
5.5
Input Voltage (V)
Input Voltage (V)
6
1121.2007.03.1.2
ANALOGICTECH [ ADVANCED ANALOGIC TECHNOLOGIES ]
