PRODUCT DATASHEET
AAT1140
SwitchReg
TM
Typical Characteristics
No Load Quiescent Current vs. Input Voltage
(V
OUT
= 1.8V, L = 4.7µH)
0.060
0.060
0.055
0.050
0.045
0.040
0.035
0.030
0.025
0.020
2.7
3.1
3.5
Fast Transient 600mA Step-Down Converter
No Load Quiescent Current vs. Input Voltage
(V
OUT
= 1.2V, L = 2.2µH)
0.055
0.050
0.045
0.040
0.035
0.030
0.025
0.020
2.7
3.1
3.5
3.9
Supply Current (µA)
Supply Current (µA)
T
A
= 85°C
T
A
= 25°C
T
A
= 25°C
T
A
= 85°C
T
A
= -40°C
3.9
4.3
4.7
5.1
5.5
T
A
= -40°C
4.3
4.7
5.1
5.5
Input Voltage (V)
Input Voltage (V)
P-Channel R
DS(ON)
vs. Input Voltage
800
700
700
N-Channel R
DS(ON)
vs. Input Voltage
85°C
R
DS(ON)
(mΩ)
Ω
600
500
400
300
200
100
2.7
3.1
3.5
3.9
4.3
4.7
85°C
R
DS(ON)
(mΩ)
Ω
600
500
400
300
200
2.7
-40°C
3.1
3.5
25°C
3.9
4.3
4.7
5.1
5.5
-40°C
25°C
5.1
5.5
Input Voltage (V)
Input Voltage (V)
Load Transient Response
(1mA to 300mA; V
IN
= 3.6V; V
OUT
= 1.8V;
C
1
= 10μF; C
FF
= 100pF)
μ
2.0
1.9
1.90
1.85
1.80
1.75
Load Transient Response
(300mA to 400mA; V
IN
= 3.6V;
V
OUT
= 1.8V; C
1
= 4.7μF)
μ
Load and Inductor Current
(200mA/div) (bottom)
Load and Inductor Current
(200mA/div) (bottom)
V
O
I
O
400mA
300mA
0.4
V
O
I
O
I
L
Output Voltage
(top) (V)
1.7
300mA
1mA
Output Voltage
(top) (V)
1.8
0
I
L
Time (50μs/div)
0.3
0.2
0.1
Time (50μs/div)
1140.2007.12.1.1
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