PRODUCT DATASHEET
AAT2503178
SystemPower
TM
Typical Characteristics—Step-Down Converter
Turn Off
(V
IN
= 3.6V; V
OUT
= 1.8V; I
OUT
= 800mA)
6.0
1.2
4.0
2.0
0.0
Adjustable 3-Channel Regulator
Line Regulation
(V
OUT
= 1.8V; V
MODE/SYNC
= V
IN
)
0.9
ENABLE
Inductor Current
(Bottom) (A)
Accuracy (%)
ENABLE and V
OUT
(Top and Middle) (V)
0.6
0.3
0.0
-0.3
-0.6
-0.9
-1.2
2.7
3.1
3.5
3.9
4.3
4.7
5.1
5.5
V
OUT
(1V/div)
1.8V
1.0
I
L
= 800mA
I
L
= 10mA
I
INDUCTOR
0V
0.5
0.0
-0.5
I
L
= 100mA
Time (100µs/div)
Input Voltage (V)
Line Regulation
(V
OUT
= 0.9V; V
MODE/SYNC
= V
IN
)
1.2
0.9
65
No Load Quiescent Current vs. V
IN
(V
OUT
= 1.8V; L = 2.2µH)
Quiescent Current (µA)
60
55
50
45
40
35
30
25
2.7
3.1
3.5
3.9
4.3
4.7
5.1
5.5
Accuracy (%)
0.6
0.3
0.0
-0.3
-0.6
-0.9
-1.2
2.7
3.1
3.5
3.9
4.3
4.7
5.1
5.5
I
L
= 800mA
T
A
= 85°C
I
L
= 650mA
T
A
= 25°C
T
A
= -40°C
Input Voltage (V)
Input Voltage (V)
No Load Quiescent Current vs. V
IN
(V
OUT
= 0.9V; L = 1µH)
50
2.0
Output Voltage Error vs. Temperature
(V
IN
= 3.6V; V
OUT
= 0.9V; I
OUT
= 800mA)
Output Voltage Error (%)
V
IN
= 1.8V
V
IN
= 2.5V
Quiescent Current (µA)
45
40
35
30
25
20
2.7
3.1
3.5
3.9
4.3
4.7
5.1
5.5
1.5
1.0
0.5
0.0
-0.5
-1.0
-1.5
-2.0
-40
T
A
= 85°C
T
A
= 25°C
T
A
= -40°C
V
OUT
= 0.9V
-20
0
20
40
60
80
100
Input Voltage (V)
Temperature (°C)
°
2503.2008.02.1.4
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