PRODUCT DATASHEET
AAT1140
SwitchReg
TM
Typical Characteristics
(V
IN
= 3.6V; V
OUT
= 1.8V; Load = 3Ω)
Ω
Enable and Output Voltage
(top) (V)
8.0
7.0
6.0
5.0
4.0
3.0
2.0
1.0
1.4
0.40
0.30
Fast Transient 600mA Step-Down Converter
Soft Start
Line Regulation
(V
OUT
= 1.8V)
EN
V
OUT
1.2
1.0
0.8
0.6
Accuracy (%)
0.20
0.10
0.00
-0.10
-0.20
-0.30
-0.40
2.5
3.0
3.5
I
OUT
= 10mA
Inductor Current
(bottom) (A)
I
OUT
= 1mA
I
IN
0.4
0.2
0.0
I
OUT
= 400mA
4.0
4.5
5.0
5.5
6.0
Time (100μs/div)
Input Voltage (V)
Output Voltage Error vs. Temperature
(V
IN
= 3.6V; V
O
= 1.8V; I
OUT
= 400mA)
2.0
15.0
12.0
9.0
Switching Frequency vs. Temperature
(V
IN
= 3.6V; V
OUT
= 1.8V)
Output Error (%)
Variation (%)
1.0
6.0
3.0
0.0
-3.0
-6.0
-9.0
-12.0
-15.0
-40
0.0
-1.0
-2.0
-40
-20
0
20
40
60
80
100
-20
0
20
40
60
80
100
°
Temperature (°C)
Temperature (°C)
°
Frequency vs. Input Voltage
2.0
No Load Quiescent Current vs. Input Voltage
(V
OUT
= 3.0V, L = 6.8µH)
60
Frequency Variation (%)
Supply Current (µA)
1.0
0.0
-1.0
-2.0
-3.0
-4.0
V
OUT
= 1.8V
55
50
45
40
35
30
25
20
3.3
3.8
T
A
= 85°C
T
A
= 25°C
V
OUT
= 2.5V
V
OUT
= 3.3V
T
A
= -40°C
4.3
4.8
5.3
2.7
3.1
3.5
3.9
4.3
4.7
5.1
5.5
Input Voltage (V)
Input Voltage (V)
6
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1140.2007.12.1.1
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