AAT1149A Datasheet, PDF (5/17 Pages) Advanced Analogic Technologies – 2.2MHz Fast Transient 400mA Step-Down Converter

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PRODUCT DATASHEET
AAT1149A
2.2MHz Fast Transient 400mA Step-Down Converter
Typical Characteristics
100
90
80
70
60
50
40
30
20
10
0
0.1
Efficiency vs. Output Current
(V_OUT = 1.875V)
VIN = 5V
VIN = 4.2V
VIN = 3.6V
V_IN = 3V
VIN = 2.7V
1
10
100
1000
Output Current (A)
Load Regulation
(V_OUT = 1.875V)
1.6
1.4
VIN = 5V
VIN = 4.2V
1.2
VIN = 3.6V
1
V_IN = 3V
0.8
V_IN = 2.2V
0.6
0.4
0.2
0
-0.2
0.1
1
10
100
1000
Output Current (A)
No Load Quiescent Current vs. Input Voltage
5
4.5
4
3.5
3
2.5
2
T = 85°C
1.5
T = 25°C
T = -40°C
1
2.5
3
3.5
4
4.5
5
5.5
6
Input Voltage (V)
Frequency Variation vs. Input Voltage
(V_OUT = 1.875V)
2
1
0
-1
-2
-3
-4
2.7
3.1
3.5
3.9
4.3
4.7
5.1
5.5
Input Voltage (V)
Switching Frequency Variation vs. Temperature
10
8
6
4
2
0
-2
-4
-6
-8
-10
-40 -20
0
20
40
60
80
Temperature (°C)
100 120
Output Voltage Error vs. Temperature
(V_IN = 3.6V; V_O = 1.875V; I_OUT = 400mA)
2.0
1.0
0.0
-1.0
-2.0
-40
-20
0
20
40
60
Temperature (°C)
80
100
1149A.2008.08.1.1
www.analogictech.com
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