AAT1121 Datasheet, PDF (7/20 Pages) Advanced Analogic Technologies – 1.5MHz, 250mA Step-Down Converter

AAT1121
1.5MHz, 250mA Step-Down Converter
Typical Characteristics
P-Channel R_DS(ON) vs. Input Voltage
1000
900
120°C 100°C
800
85°C
700
600
500
25°C
400
300
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
Input Voltage (V)
N-Channel R_DS(ON) vs. Input Voltage
750
700
120°C
650
100°C
600
85°C
550
500
450
400
350
25°C
300
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
Input Voltage (V)
Load Transient Response
(10mA to 250mA; V_IN = 3.6V; V_OUT = 1.8V;
C_OUT = 4.7µF; C_FF = 100pF)
2.0
1.9
V_O
1.8
1.7
I_O
1.6
1.5
I_LX
1.4
1.3
1.2
Time (25µs/div)
Load Transient Response
(10mA to 250mA; V_IN = 3.6V; V_OUT = 1.8V; C_OUT = 4.7µF)
2.0
1.4
1.9
1.2
V_O
1.8
1.0
1.7
0.8
1.6
I_O
0.6
1.5
0.4
1.4
I_LX
0.2
1.3
0.0
1.2
-0.2
Time (25µs/div)
Line Response
(V_OUT = 1.8V @ 250mA; C_FF = 100pF)
1.90
7.0
1.85
6.5
V_O
1.80
6.0
1.75
5.5
1.70
5.0
1.65
4.5
1.60 VIN
4.0
1.55
3.5
1.50
3.0
Time (25µs/div)
1121.2006.04.1.0
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