AAT2500M
400mA Step-Down Converter and 300mA LDO
Typical Characteristics
Step-Down Converter Load Transient Response
(1mA to 400mA; V
IN
= 5V; V
OUT
= 1.8V; C
OUT
= 4.7µF)
2.0
Step-Down Converter Load Transient Response
(1mA to 400mA; V
IN
= 5V; V
OUT
= 1.8V; C
OUT
= 4.7µF; C
FF
= 100pF)
2.0
Output Current (middle) (A)
Inductor Current (bottom) (A)
Output Current (middle) (A)
Inductor Current (bottom) (A)
Output Voltage (top) (V)
Output Voltage (top) (V)
1.8
400mA
1mA
0.4
0.2
0.0
-0.2
1.8
400mA
1mA
0.4
0.2
0.0
-0.2
Time (100µs/div)
Time (100µs/div)
Step-Down Converter Load Transient Response
(1mA to 400mA; V
IN
= 5V; V
OUT
= 1.2V; C
OUT
= 4.7µF)
1.4
Step-Down Converter Load Transient Response
(1mA to 400mA; V
IN
= 5V; V
OUT
= 1.2V; C
OUT
= 4.7µF; C
FF
= 100pF)
1.4
Output Current (middle) (A)
Inductor Current (bottom) (A)
Output Current (middle) (A)
Inductor Current (bottom) (A)
Output Voltage (top) (V)
Output Voltage (top) (V)
1.2
400mA
1mA
0.4
0.2
0.0
-0.2
1.2
400mA
1mA
0.4
0.2
0.0
-0.2
Time (100µs/div)
Time (100µs/div)
Step-Down Converter Line Transient Response
(V
IN
= 4V to 5V; V
OUT
= 1.8V; I
OUT
= 400mA; C
OUT
= 4.7µF)
6
1.00
Step-Down Converter Line Regulation
(V
OUT
= 1.2V; L = 2.2µH)
Output Voltage (bottom) (V)
Input Voltage (top) (V)
5
4
Accuracy (%)
0.50
I
OUT
= 0.1mA to 400mA
0.00
1.8
1.7
1.6
1.5
-0.50
-1.00
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
Time (40µs/div)
Input Voltage (V)
2500M.2007.06.1.0
9
ANALOGICTECH [ ADVANCED ANALOGIC TECHNOLOGIES ]
