PRODUCT DATASHEET
AAT1
189
SwitchReg
TM
Typical Characteristics
Step-Down Converter Efficiency vs. Load
(V
OUT
= 3.3V; L = 4.7µH)
100
90
80
100
90
80
High Voltage Step-Down Regulator
Step-Down Converter Efficiency vs. Load
(V
OUT
= 5V; L = 4.7µH)
Efficiency (%)
Efficiency (%)
70
60
50
40
30
20
10
0
0.1
1
10
100
70
60
50
40
30
20
10
0
0.1
1
10
100
V
IN
= 6V
V
IN
= 8V
V
IN
= 12V
V
IN
= 18V
V
IN
= 24V
1000
10000
V
IN
= 6V
V
IN
= 8V
V
IN
= 12V
V
IN
= 18V
V
IN
= 24V
1000
10000
Output Current (mA)
Output Current (mA)
Step-Down Converter DC Regulation
(V
OUT
= 3.3V; L = 4.7µH)
2.0
1.5
Step-Down Converter DC Regulation
(V
OUT
= 5V; L = 4.7µH)
3.0
2.5
2.0
1.5
1.0
0.5
0.0
-0.5
-1.0
-1.5
-2.0
-2.5
-3.0
0.1
1
10
100
1000
Output Error (%)
1.0
0.5
0.0
-0.5
-1.0
-1.5
-2.0
0.1
1
10
100
1000
10000
Output Error (%)
V
IN
= 6V
V
IN
= 8V
V
IN
= 12V
V
IN
= 18V
V
IN
= 24V
V
IN
= 6V
V
IN
= 8V
V
IN
= 12V
V
IN
= 18V
V
IN
= 24V
10000
Output Current (mA)
Output Current (mA)
Step-Down Converter Line Regulation
(V
OUT
= 3.3V; L = 4.7µH)
2.0
1.5
2.0
1.5
1.0
0.5
0.0
-0.5
-1.0
-1.5
-2.0
-2.5
-3.0
-3.5
-4.0
Step-Down Converter Line Regulation
(V
OUT
= 5V; L = 4.7µH)
Accuracy (%)
0.5
0.0
-0.5
-1.0
-1.5
-2.0
6
8
10
12
14
16
18
20
22
24
Accuracy (%)
1.0
I
OUT
= 0.10mA
I
OUT
= 10mA
I
OUT
= 100mA
I
OUT
= 1250mA
I
OUT
= 2500mA
I
OUT
= 0.10mA
I
OUT
= 10mA
I
OUT
= 100mA
I
OUT
= 1250mA
I
OUT
= 2500mA
6
8
10
12
14
16
18
20
22
24
Input Voltage (V)
Input Voltage (V)
1189.2008.06.1.0
www.analogictech.com
5
ANALOGICTECH [ ADVANCED ANALOGIC TECHNOLOGIES ]
