1MHz Step-Down Converter/LDO Regulator
Typical Characteristics
Unless otherwise noted, V
IN
= 5V, T
A
= 25°C.
AAT2500
Over-Current Protection
(EN = GND; ENLDO = V
IN
)
1200
1.250
1.225
1.200
1.175
1.150
1.125
1.100
1.075
1.050
2.5
3.0
LDO ENLDO vs. V
IN
Output Current (mA)
1000
800
600
400
200
0
-200
V
IH
V
IL
Time (50ms/div)
3.5
4.0
4.5
5.0
5.5
Input Voltage (V)
Step-Down Converter Efficiency vs. Load
(V
OUT
= 2.5V; EN = V
IN
; ENLDO = GND)
100
2.0
Step-Down Converter Load Regulation
(V
OUT
= 2.5V; EN = V
IN
; ENLDO = GND)
V
IN
= 3.0V
Efficiency (%)
90
V
IN
= 3.3V
Output Error (%)
1.0
80
V
IN
= 3.6V
V
IN
= 3.0V
0.0
70
-1.0
V
IN
= 3.3V
V
IN
= 3.6V
60
0.1
1.0
10
100
1000
-2.0
0.1
1.0
10
100
1000
Output Current (mA)
Output Current (mA)
Step-Down Converter Efficiency vs. Load
(V
OUT
= 1.8V; EN = V
IN
; ENLDO = GND)
100
90
2.0
Step-Down Converter DC Regulation
(V
OUT
= 1.8V; EN = V
IN
; ENLDO = GND)
Output Error (%)
V
IN
= 2.7V
V
IN
= 3.6V
1.0
Efficiency (%)
80
70
60
50
V
IN
= 4.2V
V
IN
= 4.2V
0.0
V
IN
= 2.7V
-1.0
V
IN
= 3.6V
0.1
1.0
10
100
1000
-2.0
0.1
1.0
10
100
1000
Output Current (mA)
Output Current (mA)
8
2500.2006.05.1.16
ANALOGICTECH [ ADVANCED ANALOGIC TECHNOLOGIES ]
