Dual Channel, Step-Down
Converter/Linear Regulator
Typical Characteristics
Unless otherwise noted, V
IN
= 5V, T
A
= 25°C.
AAT2505
Step-Down Converter Efficiency vs. Load
(V
OUT
= 1.5V; L = 4.7μH; ENLDO = GND)
μ
100
90
1.0
Step-Down Converter DC Regulation
(V
OUT
= 1.8V; L = 4.7µH; ENLDO = GND)
V
IN
= 2.7V
V
IN
= 3.6V
Output Error (%)
Efficiency (%)
0.5
80
70
60
50
0.1
1
V
IN
= 4.2V
0.0
V
IN
= 4.2V
V
IN
= 3.6V
-0.5
V
IN
= 2.7V
1
10
100
1000
10
100
1000
-1.0
0.1
Output Current (mA)
Output Current (mA)
Step-Down Converter
Frequency vs. Input Voltage
(V
OUT
= 1.8V; EN = V
IN
; ENLDO = GND)
1.0
2.0
Step-Down Converter
Output Voltage Error vs. Temperature
(V
IN
= 3.6V; V
O
= 1.5V; EN = V
IN
; ENLDO = GND)
Frequency Variation (%)
Output Error (%)
2.7
3.1
3.5
3.9
4.3
4.7
5.1
5.5
0.5
0.0
-0.5
-1.0
-1.5
-2.0
1.0
0.0
-1.0
-2.0
-40
-20
0
20
40
60
80
100
Input Voltage (V)
Temperature (°C)
°
Step-Down Converter
Switching Frequency vs. Temperature
(V
IN
= 3.6V; V
O
= 1.5V; EN = V
IN
; ENLDO = GND)
15.0
35
Step-Down Converter
Input Current vs. Input Voltage
(V
O
= 1.8V; EN = V
IN
; ENLDO = GND)
85°C
30
Frequency Variation (%)
12.0
9.0
6.0
3.0
0.0
-3.0
-6.0
-9.0
-12.0
-15.0
-40
15
-20
0
20
40
60
80
100
2.5
Input Current (μA)
μ
25°C
25
20
-40°C
3.0
3.5
4.0
4.5
5.0
5.5
Temperature (°C)
°
Input Voltage (V)
2505.2006.06.1.1
9
ANALOGICTECH [ ADVANCED ANALOGIC TECHNOLOGIES ]
