PRODUCT DATASHEET
AAT1145
SwitchRegTM
1.2A Step-Down Converter
Typical Characteristics
Efficiency vs. Output Current
(VOUT = 3.3V; TA = 25°C; L = 2.2µH)
Efficiency vs. Output Current
(VOUT = 1.8V; TA = 25°C; L = 2.2µH)
100
90
80
70
60
50
40
30
20
10
0
100
VIN = 4.2V
90
VIN = 3.6V
80
VIN = 3.6V
70
VIN = 2.5V
60
50
40
30
20
10
0
VIN = 5.0V
VIN = 5.0V
VIN = 4.2V
0.1
1
10
100
1000
10000
0.1
1
10
100
1000
10000
Output Current (mA)
Output Current (mA)
Efficiency vs. Output Current
(VOUT = 1.5V; TA = 25°C; L = 2.2µH)
Efficiency vs. Output Current
(VOUT = 1.2V; TA = 25°C; L = 2.2µH)
100
100
90
80
70
60
50
40
30
20
10
0
VIN = 2.5V
VIN = 3.6V
90
80
70
60
50
40
30
20
10
0
VIN = 2.5V
VIN = 3.6V
VIN = 5.0V
VIN = 4.2V
VIN = 5.0V
VIN = 4.2V
0.1
1
10
100
1000
10000
0.1
1
10
100
1000
10000
Output Current (mA)
Output Current (mA)
Output Voltage vs. Output Current
(VOUT = 3.3V; TA = 25°C; L = 2.2µH)
Output Voltage vs. Output Current
(VOUT = 1.8V; TA = 25°C; L = 2.2µH)
1.820
1.815
1.810
1.805
1.800
1.795
1.790
1.785
1.780
3.400
3.380
3.360
3.340
3.320
3.300
3.280
3.260
3.240
3.220
3.200
VIN = 3.6V
VIN = 5.0V
VIN = 4.2V
VIN = 4.2V
VIN = 5.0V
VIN = 3.6V
VIN = 2.5V
0
200
400
600
800
1000
1200
0
200
400
600
800
1000
1200
Output Current (mA)
Output Current (mA)
w w w . a n a l o g i c t e c h . c o m
1145.2007.11.1.1
5
ANALOGICTECH [ ADVANCED ANALOGIC TECHNOLOGIES ]
