PRODUCT DATASHEET
AAT1
149
SwitchReg
TM
Typical Characteristics
Efficiency vs. Load Current
(V
OUT
= 3V; L = 3µH)
100
1.00
3MHz Fast Transient 400mA Step-Down Converter
Load Regulation
(V
OUT
= 3V; L = 3µH)
0.75
V
IN
= 3.3V
Output Error (%)
90
Efficiency (%)
0.50
0.25
0.00
-0.25
-0.50
-0.75
V
IN
= 4.2V
V
IN
= 5V
80
70
60
50
0.1
1
10
100
1000
V
IN
= 4.2V
V
IN
= 5V
V
IN
= 3.3V
0.1
1
10
100
1000
-1.00
Load Current (mA)
Load Current (mA)
Efficiency vs. Load Current
(V
OUT
= 1.8V; L = 2.2µH)
100
90
Load Regulation
(V
OUT
= 1.8V; L = 2.2µH)
1.00
0.75
V
IN
= 3V
V
IN
= 3.6V
V
IN
= 2.7V
Output Error (%)
Efficiency (%)
0.50
0.25
0.00
-0.25
-0.50
-0.75
80
70
60
50
V
IN
= 3V
V
IN
= 4.2V
V
IN
= 5V
V
IN
= 4.2V
V
IN
= 5V
V
IN
= 3.6V
V
IN
= 2.7V
0.1
1
10
100
1000
-1.00
0.1
1
10
100
1000
Load Current (mA)
Load Current (mA)
No Load Quiescent Current vs. Input Voltage
70
2
Switching Frequency vs. Input Voltage
Supply Current (µA)
60
50
40
30
20
10
0
2.5
85°C
Frequency Variation (%)
25°C
1
0
-1
-2
-3
-4
V
OUT
= 1.1V
-40°C
V
OUT
= 1.8V
V
OUT
= 3V
3
3.5
4
4.5
5
5.5
6
2.5
3
3.5
4
4.5
5
5.5
Input Voltage (V)
Input Voltage (V)
1149.2008.08.1.3
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