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