AAT2504
Adjustable 3-Channel Regulator
Typical Characteristics–Step-Down Converter
Step-Down Converter Efficiency vs. Output Current
(V
OUT
= 1.8V)
100
90
80
0.4
0.3
Output Voltage Error vs. Temperature
(V
IN
= 3.6V; V
OUT
= 2.5V)
400mA
Output Error (%)
Efficiency (%)
0.2
0.1
0.0
-0.1
-0.2
-0.3
-0.4
600mA
70
60
50
40
30
20
10
0
0.1
1
10
100
1000
V
IN
= 5.5V
V
IN
= 4.2V
V
IN
= 3.6V
V
IN
= 2.7V
PWM/Light Load Mode
Forced PWM Mode
800mA 100mA
-0.5
-40
-15
10
35
60
85
Output Current (mA)
Temperature (°C)
Step-Down Converter Load Regulation
(V
OUT
= 2.5V; Forced PWM)
0.2
0.4
Step-Down Converter Line Regulation
(V
OUT
= 2.5V; Forced PWM)
Output Voltage Error (%)
0.1
0.0
-0.1
V
IN
= 3V
V
IN
= 3.6V
Output Voltage Error (%)
0.3
0.2
0.1
0.0
-0.1
-0.2
1mA
50mA
100mA
V
IN
= 4.2V
-0.2
-0.3
0.1
1
10
100
1000
V
IN
= 5.5V
600mA
2.8
3.1
3.4
3.7
4.0
4.3
4.6
4.9
800mA
5.2
5.5
Output Current (mA)
Input Voltage (V)
Step-Down Converter Output Ripple
(V
IN
= 3.6V; V
OUT
= 1.8V; I
OUT
= 800mA)
Step-Down Converter Load Transient
(V
IN
= 3.6V; I
OUT
= 300mA to 650mA)
Inductor Current (bottom) (A)
1.82
2.2
Load and Inductor Current
(bottom) (A)
Output Voltage (top) (V)
Output Voltage (top) (V)
1.81
1.80
1.79
V
OUT
2.0
1.8
1.6
V
OUT
I
OUT
I
L
0.9
0.6
0.3
0.0
I
INDUCTOR
1.0
0.8
0.6
0.4
0.2
Time (200ns/div)
Time (20µs/div)
6
2504.2007.06.1.0
ANALOGICTECH [ ADVANCED ANALOGIC TECHNOLOGIES ]
