PRODUCT DATASHEET
AAT1
149
SwitchReg
TM
Typical Characteristics
Load Transient
(V
OUT
= 1.1V; No Feedforward Capacitor)
1.30
2.00
1.75
400mA
1.50
1.25
1.00
1mA
0.75
0.50
0.25
0.00
1.30
3MHz Fast Transient 400mA Step-Down Converter
Load Transient
(V
OUT
= 1.1V; C
FF
= 100pF)
2.00
1.75
1.50
400mA
1mA
1.25
1.00
0.75
0.50
0.25
0.00
Load and Inductor Current
(bottom) (A)
Load and Inductor Current
(bottom) (A)
Output Voltage (top) (V)
Output Voltage (top) (V)
1.20
1.10
1.00
0.90
0.80
0.70
0.60
0.50
1.20
1.10
1.00
0.90
0.80
0.70
0.60
0.50
Time (50µs/div)
Time (50µs/div)
Load Transient
(V
OUT
= 1.8V; No Feedforward Capacitor)
2.25
2.00
1.75
1.50
400mA
10mA
1.25
1.00
0.75
2.00
Load Transient
(V
OUT
= 1.8V; C
FF
= 100pF)
2.00
1.75
1.50
400mA
10mA
1.25
1.00
0.75
0.50
0.25
0.00
Load and Inductor Current
(bottom) (A)
Load and Inductor Current
(bottom) (A)
Output Voltage (top) (V)
Output Voltage (top) (V)
2.00
1.75
1.50
1.25
1.00
0.75
0.50
0.25
1.90
1.80
1.70
1.60
1.50
1.40
1.30
1.20
0.25
0.00
Time (50µs/div)
Time (50µs/div)
Load Transient
(V
OUT
= 1.8V; No Feedforward Capacitor)
2.25
2.00
1.75
1.50
400mA
1mA
1.25
1.00
0.75
0.50
0.25
0.00
2.00
Load Transient
(V
OUT
= 1.8V; C
FF
= 100pF)
2.00
1.75
1.50
400mA
1.25
1.00
1mA
0.75
0.50
0.25
0.00
Load and Inductor Current
(bottom) (A)
Load and Inductor Current
(bottom) (A)
Output Voltage (top) (V)
Output Voltage (top) (V)
2.00
1.75
1.50
1.25
1.00
0.75
0.50
0.25
1.90
1.80
1.70
1.60
1.50
1.40
1.30
1.20
Time (50µs/div)
Time (50µs/div)
8
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1149.2008.08.1.3
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