AAT2500M
400mA Step-Down Converter and 300mA LDO
Typical Characteristics
LDO Dropout Voltage vs. Temperature
210
3.5
LDO Dropout Characteristics
(V
OUT
= 3.3V)
I
OUT
= 50mA
Dropout Voltage (mV)
Output Voltage (V)
180
150
120
90
60
30
0
-40
I
L
= 300mA
I
L
= 200mA
I
L
= 100mA
I
L
= 50mA
-20
0
20
40
60
80
100
3.4
3.3
3.2
3.1
3.0
2.9
2.8
3.0
I
OUT
= 10mA
I
OUT
= 0.1mA
I
OUT
= 300mA
I
OUT
= 200mA
I
OUT
= 100mA
3.1
3.2
3.3
3.4
3.5
3.6
3.7
Temperature (°C)
Input Voltage (V)
LDO Dropout Voltage vs. Output Current
250
No Load Quiescent Current vs. Input Voltage
(EN_BUCK = EN_LDO = V
IN
)
150
Dropout Voltage (mV)
Input Current (µA)
200
150
100
50
0
0
50
100
85°C
25°C
130
110
90
70
50
30
2.5
85°C
25°C
-40°C
-40°C
150
200
250
300
350
3
3.5
4
4.5
5
5.5
6
Output Current (mA)
Input Voltage (V)
LDO Turn-Off Response Time
(V
IN
= 5V; V
OUT
= 3.3V; I
OUT
= 300mA)
6
6
LDO Turn-On Time From Enable
(V
IN
= 5V; V
OUT
= 3.3V; I
OUT
= 300mA)
Output Voltage (bottom)(V)
Output Voltage (bottom)(V)
Enable Voltage (top) (V)
4
2
0
3
2
1
0
-1
Enable Voltage (top) (V)
4
2
0
3.0
2.0
1.0
0.0
-1.0
Time (50ns/div)
Time (40µs/div)
2500M.2007.06.1.0
5
ANALOGICTECH [ ADVANCED ANALOGIC TECHNOLOGIES ]
