AAT1142 Datasheet, PDF (7/22 Pages) Advanced Analogic Technologies – 800mA Voltage-Scaling Step-Down Converter

AAT1142
800mA Voltage-Scaling Step-Down Converter
Typical Characteristics
Efficiency vs. Load
(V_OUT = 1.8V)
100
90 ^{VIN = 3.6V VIN = 2.7V}
80
70
V_IN = 4.2V
60
V_IN = 5.0V
50
40
PWM Only
Mode
30
0
1
10
100
1000
Output Current (mA)
2.0
1.6
1.2
0.8
0.4
0.0
-0.4
-0.8
-1.2
-1.6
-2.0
0
DC Regulation
(V_OUT = 1.8V)
V_IN = 5.0V
V_IN = 4.2V
V_IN = 2.7V
V_IN = 3.6V
1
10
100
1000
Output Current (mA)
Soft Start
(V_IN = 3.6V; V_OUT = 1.8V; I_OUT = 800mA)
4.0
3.5
3.0
3
2.0
2.5
1.0
2
0.0
1.5
-1.0
1
-2.0
0.5
-3.0
0
-4.0
-0.5
Time (50µs/div)
1.00
0.75
0.50
0.25
0.00
-0.25
-0.50
-0.75
-1.00
2.5
Line Regulation
(V_OUT = 1.0V)
I_OUT = 650mA
I_OUT = 100mA
I_OUT = 0mA
3.0
3.5
4.0
4.5
5.0
5.5
Input Voltage (V)
Output Voltage Accuracy vs. Temperature
(V_IN = 3.6V; V_OUT = 1.0V; I_OUT = 400mA)
2.0
1.5
1.0
0.5
0.0
-0.5
-1.0
-1.5
-2.0
-40 -30 -20 -10 0
10 20 30 40 50 60 70 80
Temperature (°C)
Switching Frequency vs. Temperature
(V_IN = 3.6V; V_OUT = 1.0V; I_OUT = 400mA)
4.0
2.0
0.0
-2.0
-4.0
-6.0
-8.0
-10.0
-40 -30 -20 -10 0 10 20 30 40 50 60 70 80
Temperature (°C)
1142.2006.07.1.0
7