AAT1149 Datasheet, PDF (8/20 Pages) Advanced Analogic Technologies – 3MHz Fast Transient 400mA Step-Down Converter

Typical Characteristics
Load Transient
(V_OUT = 1.8V; No Feedforward Capacitor)
2.25
2.00
2.00
1.75
1.75
1.50
1.50
400mA
1.25
1.25
1.00
10mA
1.00
0.75
0.75
0.50
0.25
0.25
0.00
Time (50µs/div)
Load Transient
(V_OUT = 1.8V; No Feedforward Capacitor)
2.25
2.00
2.00
1.75
1.75
1.50
400mA
1.50
1.25
1.25
1.00
1mA
1.00
0.75
0.75
0.50
0.50
0.25
0.25
0.00
Time (50µs/div)
Soft Start
(V_OUT = 1.8V; No Feedforward Capacitor)
4.00
2.00
3.00
1.75
2.00
1.50
1.00
1.25
0.00
1.00
-1.00
0.75
-2.00
0.50
-3.00
0.25
-4.00
0.00
Time (50µs/div)
8
AAT1149
3MHz Fast Transient
400mA Step-Down Converter
Load Transient
(V_OUT = 1.8V; C_FF = 100pF)
2.00
2.00
1.90
1.75
1.80
1.50
1.70
1.25
400mA
1.60
1.00
1.50
10mA
0.75
1.40
0.50
1.30
0.25
1.20
0.00
Time (50µs/div)
Load Transient
(V_OUT = 1.8V; C_FF = 100pF)
2.00
2.00
1.90
1.75
1.80
1.50
1.70
400mA
1.25
1.60
1.00
1.50
1mA
0.75
1.40
0.50
1.30
0.25
1.20
0.00
Time (50µs/div)
2.50
2.00
1.50
1.00
0.50
0.00
-0.50
-1.00
-1.50
Soft Start
(V_OUT = 1.8V; C_FF = 100pF)
2.00
1.75
1.50
1.25
1.00
0.75
0.50
0.25
0.00
Time (50µs/div)
1149.2006.11.1.0