PRODUCT DATASHEET
AAT1
149
SwitchReg
TM
Typical Characteristics
Soft Start
(V
OUT
= 1.8V; No Feedforward Capacitor)
Enable and Output Voltage
(top) (V)
3.00
2.00
1.00
0.00
-1.00
-2.00
-3.00
-4.00
1.75
1.50
1.25
1.00
0.75
0.50
0.25
0.00
3MHz Fast Transient 400mA Step-Down Converter
Soft Start
(V
OUT
= 1.8V; C
FF
= 100pF)
Enable and Output Voltage
(top) (V)
2.50
2.00
1.50
1.00
0.50
0.00
-0.50
-1.00
-1.50
2.00
1.75
1.50
1.25
1.00
0.75
0.50
0.25
0.00
2.00
4.00
Inductor Current
(bottom) (250mA/div)
Inductor Current
(bottom) (250mA/div)
Time (50µs/div)
Time (50µs/div)
Soft Start
(V
OUT
= 3V; No Feedforward Capacitor)
Enable and Output Voltage
(top) (V)
Enable and Output Voltage
(top) (V)
4.00
3.00
2.00
1.00
0.00
-1.00
-2.00
-3.00
-4.00
2.00
1.75
1.50
1.25
1.00
0.75
0.50
0.25
0.00
3.50
3.00
2.50
2.00
1.50
1.00
0.50
0.00
-0.50
Soft Start
(V
OUT
= 1.1V; No Feedforward Capacitor)
1.25
1.00
0.75
0.50
0.25
0.00
-0.25
-0.50
-0.75
Inductor Current
(bottom) (250mA/div)
Inductor Current
(bottom) (250mA/div)
Time (50µs/div)
Time (20µs/div)
1149.2008.08.1.3
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