PRODUCT DATASHEET
AAT1
189
SwitchReg
TM
Typical Characteristics
Step-Down Converter Soft Start
(V
IN
= 12V; V
EN
= 10V; V
OUT
= 3.3V; I
OUT
= 2.5A)
Enable Voltage (top) (V)
Output Voltage (middle) (V)
10
High Voltage Step-Down Regulator
Step-Down Converter Soft Start
(V
IN
= 12V; V
EN
= 10V; V
OUT
= 5V; I
OUT
= 2.5A)
Enable Voltage (top) (V)
Output Voltage (middle) (V)
15
10
15
Inductor Current
(bottom) (A)
Output Current
(bottom) (A)
5
0
5
0
4.0
2.0
0.0
4.0
2.0
0.0
Time (500µs/div)
Time (500µs/div)
Step-Down Converter Switching Frequency
vs. Temperature
Switching Frequency (KHz)
(V
OUT
= 5V; L = 4.7µH)
Frequency Variation (%)
500
490
480
470
460
450
440
-40
Step-Down Converter Switching Frequency
vs. Input Voltage
(V
IN
= 6V to 24V; V
OUT
= 3.3V; I
OUT
= 2.5A)
8
6
4
2
0
-2
-4
-6
-8
6
8
10
12
14
16
18
20
22
24
-20
0
20
40
60
80
100
Temperature (°C)
Input Voltage (V)
V
IH
and V
IL
vs. Input Voltage
1.35
650
No Load Step-Down Converter
Input Current vs. Input Voltage
(V
EN
= V
IN
)
Input Current (µA)
1.30
V
IH
V
IH
and V
IL
(%)
600
550
500
450
400
350
300
1.25
1.20
1.15
1.10
V
IL
1.05
1.00
5
10
15
20
25
85°C
25°C
-40°C
6
9
12
15
18
21
24
Input Voltage (V)
Input Voltage (V)
8
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1189.2008.06.1.0
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