PRODUCT DATASHEET
AAT1145
SwitchReg
TM
Typical Characteristics
Efficiency vs. Output Current
(V
OUT
= 3.3V; T
A
= 25°C; L = 2.2µH)
°
100
90
80
100
90
80
1.5A Step-Down Converter
Efficiency vs. Output Current
(V
OUT
= 1.8V; T
A
= 25°C; L = 2.2µH)
°
Efficiency (%)
70
60
50
40
30
20
10
0
0.1
1
10
100
Efficiency (%)
70
60
50
40
30
20
10
0
0.1
1
10
100
V
IN
= 3.7V
V
IN
= 4.2V
V
IN
= 5V
V
IN
= 5.5V
1000
10000
V
IN
= 2.5V
V
IN
= 3.6V
V
IN
= 4.2V
V
IN
= 5V
V
IN
= 5.5V
1000
10000
Output Current (mA)
Output Current (mA)
Efficiency vs. Output Current
(V
OUT
= 1.5V; T
A
= 25°C; L = 2.2µH)
°
100
90
80
100
90
80
Efficiency vs. Output Current
(V
OUT
= 1.2V; T
A
= 25°C; L = 2.2µH)
Efficiency (%)
70
60
50
40
30
20
10
0
0.1
1
10
100
Efficiency (%)
70
60
50
40
30
20
10
0
0.1
1
10
100
V
IN
= 2.7V
V
IN
= 3.6V
V
IN
= 4.2V
V
IN
= 5V
V
IN
= 5.5V
1000
10000
V
IN
= 2.5V
V
IN
= 3.6V
V
IN
= 4.2V
V
IN
= 5V
1000
10000
Output Current (mA)
Output Current (mA)
DC Regulation
(V
OUT
= 3.3V; T
A
= 25°C; L = 2.2µH; C
OUT
= 22µF)
3.399
1.854
DC Regulation
(V
OUT
= 1.8V; T
A
= 25°C; L = 2.2µH; C
OUT
= 22µF)
V
IN
= 5.5V
V
IN
= 5V
V
IN
= 4.2V
V
IN
= 3.6V
V
IN
= 2.5V
V
IN
= 5.5V
V
IN
= 5V
V
IN
= 4.2V
V
IN
= 3.7V
Output Voltage (V)
Output Voltage (V)
3.366
3.333
3.300
3.267
3.234
3.201
1.836
1.818
1.800
1.782
1.764
1.746
0
300
600
900
1200
1500
0
300
600
900
1200
1500
Output Current (mA)
Output Current (mA)
1145.2008.01.1.2
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