AAT2500M
400mA Step-Down Converter and 300mA LDO
Typical Characteristics
Step-Down Converter Output
Voltage Error vs. Temperature
(V
IN
= 5V; V
OUT
= 1.8V; I
OUT
= 400mA)
Output Voltage Error (%)
1.0
Step-Down Converter Output
Voltage Error vs. Temperature
(V
IN
= 5V; V
OUT
= 1.2V; I
OUT
= 400mA)
Output Voltage Error (%)
1.0
0.5
0.5
0.0
0.0
-0.5
-0.5
-1.0
-50
-25
0
25
50
75
100
-1.0
-50
-25
0
25
50
75
100
Temperature (°C)
Temperature (°C)
Step-Down Converter P-Channel
R
DS(ON)H
vs. Input Voltage
700
Step-Down Converter N-Channel
R
DS(ON)L
vs. Input Voltage
500
120°C
100°C
R
DS(ON)L
(mΩ)
Ω
85°C
120°C
100°C
85°C
R
DS(ON)H
(mΩ)
Ω
600
400
500
300
400
200
25°C
300
2.5
3
3.5
4
4.5
5
5.5
6
100
2.5
25°C
3
3.5
4
4.5
5
5.5
6
Input Voltage (V)
Input Voltage (V)
Step-Down Converter Soft Start
(V
IN
= 5V; V
OUT
= 1.8V; I
OUT
= 400mA; C
FF
= Open)
Inductor Current (bottom) (A)
Enable Voltage (top) (V)
Output Voltage (middle) (V)
6
4
2
0
-2
0.4
0.2
0.0
-0.2
Time (50µs/div)
8
2500M.2007.06.1.0
ANALOGICTECH [ ADVANCED ANALOGIC TECHNOLOGIES ]
