PRODUCT DATASHEET
AAT1
149
SwitchReg
TM
Typical Characteristics
Switching Frequency Variation vs. Temperature
10
8
6
2.0
3MHz Fast Transient 400mA Step-Down Converter
Output Voltage Error vs. Temperature
(V
IN
= 3.6V; V
O
= 1.8V; I
OUT
= 400mA)
Output Error (%)
Variation (%)
4
2
0
-2
-4
-6
-8
-10
-40
-20
0
20
40
60
80
100
120
1.0
0.0
-1.0
-2.0
-40
-20
0
20
40
60
80
100
Temperature (°C)
°
Temperature (°C)
°
Line Regulation
(V
OUT
= 3V)
1
0.8
0.6
Line Regulation
(V
OUT
= 1.8V)
1
0.8
0.6
Accuracy (%)
Accuracy (%)
0.4
0.2
0
-0.2
-0.4
-0.6
-0.8
-1
2.5
3
3.5
1mA
400mA
300mA
600mA
100mA
0mA
0.4
0.2
0
-0.2
-0.4
-0.6
-0.8
-1
400mA
0mA
100mA
600mA
4
4.5
5
5.5
2.5
3
3.5
4
4.5
5
5.5
6
Input Voltage (V)
Input Voltage (V)
Line Regulation
(V
OUT
= 1.1V)
1
0.6
4.50
Line Transient
(V
OUT
= 1.8; 400mA Load; No Feedforward Capacitor)
1.90
1.88
1.86
1.84
1.82
1.80
1.78
1.76
1.74
Output Voltage (bottom) (V)
Input Voltage (top) (V)
6
0.8
4.25
4.00
3.75
3.50
3.25
3.00
2.75
2.50
Accuracy (%)
0.4
0.2
0
-0.2
-0.4
-0.6
-0.8
1mA
0mA
400mA
600mA
-1
2.5
3
3.5
4
4.5
5
5.5
Input Voltage (V)
Time (50µs/div)
6
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1149.2008.08.1.3
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