AAT2503
Adjustable 3-Channel Regulator
Typical Characteristics—Step-Down Converter
Efficiency vs. Output Current
(V
OUT
= 2.5V; L = 3.3µH)
100
90
80
100
90
80
Efficiency vs. Output Current
(V
OUT
= 1.8V; L = 2.2µH)
V
IN
= 3.6V
V
IN
= 2.7V
PWM Only
Mode
Efficiency (%)
70
60
50
40
30
20
10
0
0
V
IN
= 3.3V
V
IN
= 3.6V
V
IN
= 4.2V
PWM Only
Mode
Efficiency (%)
70
60
50
40
30
20
10
0
V
IN
= 4.2V
1
10
100
1000
0
1
10
100
1000
Output Current (mA)
Output Current (mA)
Efficiency vs. Output Current
(V
OUT
= 0.9V; L = 1µH)
90
80
2.4
2.3
Switching Frequency vs. Temperature
(V
IN
= 3.6V; I
OUT
= 800mA)
Efficiency (%)
70
60
50
40
30
20
10
0
0
1
Frequency (MHz)
V
IN
= 2.7V
V
IN
= 3.6V
V
IN
= 4.2V
PWM Only
Mode
2.2
2.1
2.0
1.9
1.8
1.7
1.6
V
OUT
= 0.9V
V
OUT
= 1.8V
V
OUT
= 2.5V
10
100
1000
1.5
-40
-20
0
20
40
60
80
100
Output Current (mA)
Temperature (°C)
°
Load Regulation
(V
OUT
= 1.8V; V
MODE/SYNC
= V
IN
; L = 2.2µH)
1.2
Soft Start
(V
IN
= 3.6V; V
OUT
= 1.8V; I
OUT
= 800mA)
6.0
4.0
2.0
0.0
ENABLE and V
OUT
(Top and Middle) (V)
0.9
ENABLE
Inductor Current
(Bottom) (A)
Accuracy (%)
0.6
0.3
0.0
-0.3
-0.6
-0.9
-1.2
0
1
10
100
1000
1.8V
V
IN
= 4.2V
V
IN
= 3.3V V
IN
= 3.6V
V
OUT
I
INDUCTOR
0V
1.0
0.5
0.0
-0.5
Output Current (mA)
Time (100µs/div)
6
2503.2007.04.1.1
ANALOGICTECH [ ADVANCED ANALOGIC TECHNOLOGIES ]
