AAT2500M
400mA Step-Down Converter and 300mA LDO
Typical Characteristics
LDO Line Transient Response
(V
IN
= 4V to 5V; V
OUT
= 3.3V; I
OUT
= 300mA; C
OUT
= 4.7µF)
Output Voltage (bottom) (V)
Output Voltage (top) (V)
Input Voltage (top) (V)
3.7
3.5
3.3
3.1
2.9
300mA
1mA
0.4
0.2
0.0
-0.2
LDO Load Transient Response
(1mA to 300mA; V
IN
= 5V; V
OUT
= 3.3V; C
OUT
= 4.7µF)
Output Current (bottom) (A)
5
4
3.5
3.3
3.1
Time (40µs/div)
Time (100µs/div)
LDO V
IH
and V
IL
vs. Input Voltage
1.2
1.1
V
IH
V
IH
and V
IL
(V)
1.0
0.9
0.8
0.7
0.6
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
V
IL
Input Voltage (V)
Step-Down Converter Switching
Frequency vs. Input Voltage
Frequency Variation (%)
3
2
1
0
-1
-2
-3
Step-Down Converter Switching
Frequency vs. Temperature
Switching Frequency (MHz)
(V
IN
= 5V; V
OUT
= 1.8V)
1.9
(I
OUT
= 400mA)
V
OUT
= 1.8V
V
OUT
= 1.2V
1.8
1.7
1.6
2.7
3.1
3.5
3.9
4.3
4.7
5.1
5.5
1.5
-40
-20
0
20
40
60
80
100
Input Voltage (V)
Temperature (°C)
6
2500M.2007.06.1.0
ANALOGICTECH [ ADVANCED ANALOGIC TECHNOLOGIES ]
