PRODUCT DATASHEET
AAT1141
SwitchReg
TM
Typical Characteristics
Load Transient Response
(300mA to 400mA; V
IN
= 3.6V;
V
OUT
= 1.8V; C
1
= 10μF)
μ
1.90
1.85
1.80
1.75
Fast Transient 600mA Step-Down Converter
Load Transient Response
(300mA to 400mA; V
IN
= 3.6V; V
OUT
= 1.8V;
C
1
= 10µF; C
FF
= 100pF)
1.850
1.825
1.800
1.775
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
Output Voltage
(top) (V)
Output Voltage
(top) (V)
400mA
300mA
0.4
I
L
Time (50μs/div)
0.3
0.2
0.1
I
L
Time (50µs/div)
0.3
0.2
0.1
Line Response
(V
OUT
= 1.8V @ 400mA)
Output Voltage (AC coupled)
(top) (mV)
1.82
1.81
6.0
5.5
40
20
0
-20
-40
-60
-80
-100
-120
Output Ripple
(V
IN
= 3.6V; V
OUT
= 1.8V; I
OUT
= 1mA)
0.30
V
O
0.25
Inductor Current
(bottom) (A)
Output Voltage
(top) (V)
0.20
0.15
0.10
Input Voltage
(bottom) (V)
1.80
1.79
1.78
1.77
1.76
5.0
4.5
4.0
3.5
3.0
I
L
0.05
0.00
-0.05
-0.10
Time (25μs/div)
μ
Time (10µs/div)
(V
IN
= 3.6V; V
OUT
= 1.8V; Load = 3Ω)
Ω
Output Voltage (AC coupled)
(top) (V)
0.08
0.07
0.06
0.05
0.04
0.03
0.02
0.01
0.00
1.40
1.20
Output Ripple
Inductor Current
(bottom) (A)
1.00
0.80
0.60
0.40
0.20
0.00
Time (40ns/div)
8
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1141.2007.12.1.3
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