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