AAT2504
Adjustable 3-Channel Regulator
Typical Characteristics–Step-Down Converter
Step-Down Converter Line Transient
(V
OUT
= 1.8V; I
OUT
= 800mA; V
IN
= 3.6V-4.2V)
No Load Quiescent Current vs. Input Voltage
(Step-Down Converter Enabled; Both LDOs Enabled)
Output Voltage (AC Coupled)
(bottom) (V)
5.0
160
4.5
4.0
3.5
0.02
0.00
-0.02
Quiescent Current (µA)
Input Voltage (top) (V)
140
120
100
80
60
40
20
0
2.7
3.1
3.5
3.9
4.3
4.7
5.1
5.5
85°C
25°C
-40°C
Time (20µs/div)
Input Voltage (V)
No Load Quiescent Current vs. Input Voltage
(Step-Down Converter Enabled; Both LDOs Disabled)
Step-Down Converter Switching Frequency
vs. Temperature
Switching Frequency (MHz)
(V
IN
= 3.6V; V
OUT
= 1.2V)
2.05
2.00
1.95
1.90
1.85
1.80
1.75
-40
-15
10
35
60
85
110
Quiescent Current (µA)
100
90
80
70
60
50
40
30
20
2.7
600mA
400mA
800mA
85°C
25°C
-40°C
3.1
3.5
3.9
4.3
4.7
5.1
5.5
Input Voltage (V)
Temperature (ºC)
Step-Down Converter Soft Start
(V
IN
= 3.6V; V
OUT
= 1.8V; I
OUT
= 800mA)
Step-Down Converter Turn-Off
(V
IN
= 3.6V; V
OUT
= 1.8V; I
OUT
= 800mA)
Inductor Current (bottom) (A)
Inductor Current (bottom) (A)
6
4
EN
1.8V
6
4
EN
Enable (top) (V)
V
OUT
(middle) (V)
Enable (top) (V)
V
OUT
(middle) (V)
2
0
V
OUT
0V
2
0
V
OUT
I
L
0V
1.8V
1.0
0.5
0.0
1.5
1.0
0.5
I
L
0.0
Time (50µs/div)
Time (100µs/div)
2504.2007.06.1.0
7
ANALOGICTECH [ ADVANCED ANALOGIC TECHNOLOGIES ]
