PRODUCT DATASHEET
AAT1
184
SwitchReg
TM
Typical Characteristics
Step-Down Converter Soft Start
(V
IN
= 12V; V
EN
= 10V; V
OUT
= 3.3V; I
OUT
= 1.2A)
Enable Voltage (top) (V)
Output Voltage (middle) (V)
Enable Voltage (top) (V)
Output Voltage (middle) (V)
15
10
15
10
High Voltage Step-Down Regulator
Step-Down Converter Soft Start
(V
IN
= 12V; V
EN
= 10V; V
OUT
= 5V; I
OUT
= 1.2A)
Inductor Current
(bottom) (A)
Inductor Current
(bottom) (A)
5
0
5
0
2
1
0
2
1
0
Time (500µs/div)
Time (500µs/div)
Step-Down Converter Switching Frequency
vs. Input Voltage
(V
IN
= 6V to 24V; V
OUT
= 3.3V; I
OUT
= 1.2A)
Frequency Variation (%)
Output Voltage Error (%)
2.0
1.5
1.0
0.5
0.0
-0.5
-1.0
-1.5
-2.0
6
8
10
12
14
16
18
20
22
24
1.5
1.0
0.5
0.0
-0.5
-1.0
-1.5
-50
Step-Down Converter Output
Voltage Error vs. Temperature
(V
IN
= 12V; V
OUT
= 3.3V)
I
OUT
= 0.1mA
I
OUT
= 10mA
I
OUT
= 100mA
I
OUT
= 600mA
I
OUT
= 1200mA
-25
0
25
50
75
100
Input Voltage (V)
Temperature (°C)
Step-Down Converter Output
Voltage Error vs. Temperature
(V
IN
= 12V; V
OUT
= 5V)
Output Voltage Error (%)
1.0
0.8
0.6
0.4
0.2
0.0
-0.2
-0.4
-0.6
-0.8
-1.0
-50
-25
0
25
50
75
100
No Load Step-Down Converter
Input Current vs. Input Voltage
(V
EN
= V
IN
)
650
Input Current (µA)
I
OUT
= 0.1mA
I
OUT
= 10mA
I
OUT
= 100mA
I
OUT
= 600mA
I
OUT
= 1200mA
600
550
500
450
400
350
300
6
9
12
15
18
21
24
85°C
25°C
-40°C
Temperature (°C)
Input Voltage (V)
8
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1184.2008.07.1.0
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