AAT2500 Datasheet, PDF (10/26 Pages) Advanced Analogic Technologies – 1MHz Step-Down Converter/LDO Regulator

AAT2500
1MHz Step-Down Converter/LDO Regulator
Typical Characteristics
Unless otherwise noted, V_IN = 5V, T_A = 25°C.
Step-Down Converter Load Transient Response
(30mA - 300mA; V_IN = 3.6V; V_OUT = 1.8V;
C1 = 10μF; EN = V_IN; ENLDO = GND)
2.0
1.4
1.9
1.2
1.8
1.0
1.7
300mA
0.8
1.6
30mA
0.6
1.5
0.4
1.4
0.2
1.3
0.0
1.2
-0.2
Time (25μs/div)
Step-Down Converter Load Transient Response
(30mA - 300mA; V_IN = 3.6V; V_OUT = 1.8V; C1 = 10μF;
C4 = 100pF; EN = V_IN; ENLDO = GND)
0.1
1.4
0.0
1.2
-0.1
300mA
1.0
-0.2
30mA
0.8
-0.3
0.6
-0.4
0.4
-0.5
0.2
-0.6
0.0
-0.7
-0.2
Time (25μs/div)
Step-Down Converter Load Transient Response
(30mA - 300mA; V_IN = 3.6V; V_OUT = 1.8V;
C1 = 4.7μF; EN = V_IN; ENLDO = GND)
2.0
1.4
1.9
1.2
1.8
1.0
1.7
300mA
0.8
1.6
30mA
0.6
1.5
0.4
1.4
0.2
1.3
0.0
1.2
-0.2
Time (25μs/div)
Step-Down Converter Line Regulation
(V_OUT = 1.8V; EN = V_IN; ENLDO = GND)
0.1
0.05 _{IOUT = 100mA}
0
-0.05
-0.1
-0.15
I_OUT = 10mA
-0.2
-0.25
I_OUT = 400mA
-0.3
-0.35
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
Input Voltage (V)
10
Step-Down Converter Line Transient
(V_OUT = 1.8V @ 400mA; EN = V_IN; ENLDO = GND)
1.90
7.0
1.85
6.5
1.80
6.0
1.75
5.5
1.70
5.0
1.65
4.5
1.60
4.0
1.55
3.5
1.50
3.0
Time (25μs/div)
Step-Down Converter Soft Start
(V_IN = 3.6V; V_OUT = 1.8V; 400mA;
EN = V_IN; ENLDO = GND)
4.0
3.5
3.0
3.0
2.0
2.5
1.0
2.0
0.0
1.5
-1.0
1.0
-2.0
0.5
-3.0
0.0
-4.0
-0.5
250μs/div
2500.2006.05.1.16