AAT1149 Datasheet, PDF (7/20 Pages) Advanced Analogic Technologies – 3MHz Fast Transient 400mA Step-Down Converter

Typical Characteristics
N-Channel R_DS(ON) vs. Input Voltage
750
700
650
120°C _100°C
600
550
500
450
85°C
400
25°C
350
300
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
Input Voltage (V)
Line Transient
(V_OUT = 1.8; No Load; No Feedforward Capacitor)
4.50
1.94
4.25
1.92
4.00
1.90
3.75
1.88
3.50
1.86
3.25
1.84
3.00
1.82
2.75
1.80
2.50
1.78
Time (50µs/div)
Load Transient
(V_OUT = 1.1V; No Feedforward Capacitor)
1.30
2.00
1.20
1.75
1.10
1.50
400mA
1.00
1.25
0.90
1.00
0.80
1mA
0.75
0.70
0.50
0.60
0.25
0.50
0.00
Time (50µs/div)
AAT1149
3MHz Fast Transient
400mA Step-Down Converter
P-Channel R_DS(ON) vs. Input Voltage
750
700
650
120°C 100°C
600
550
500
85°C
450
25°C
400
350
300
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
Input Voltage (V)
Line Transient
(V_OUT = 1.8; C_FF = 100pF)
1.86
4.50
1.85
4.25
1.84
4.00
1.83
3.75
1.82
3.50
1.81
3.25
1.80
3.00
1.79
2.75
1.78
2.50
Time (20µs/div)
Load Transient
(V_OUT = 1.1V; C_FF = 100pF)
1.30
2.00
1.20
1.75
1.10
1.50
1.00
400mA
1.25
0.90
1.00
1mA
0.80
0.75
0.70
0.50
0.60
0.25
0.50
0.00
Time (50µs/div)
1149.2006.11.1.0
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