1MHz 2.5A Step-Down DC/DC Converter
Typical Characteristics
Efficiency vs. Load Current
(V
IN
= 5.0V; V
OUT
= 3.3V)
100
95
90
80
AAT1155
R
DS(ON)
vs. Temperature
2.7V
3.6V
4.2V
Efficiency (%)
R
DS(ON)
(mΩ)
90
85
80
75
70
65
60
0.01
0.1
1
10
70
60
5.0V
50
40
-20
0
20
40
60
80
5.5V
100
120
Output Current (A)
Temperature (°C)
Oscillator Frequency Variation
vs. Input Voltage
(V
OUT
= 3.3V)
0.5
80
75
R
DS(ON)
vs. Input Voltage
(I
DS
= 1A)
Variation (%)
0.25
R
DS(ON)
(mΩ)
Ω
70
65
60
55
50
45
40
2.5
3
3.5
4
4.5
5
5.5
0
-0.25
-0.5
3.5
4
4.5
5
5.5
Input Voltage (V)
Input Voltage (V)
Oscillator Frequency Variation vs. Temperature
(V
IN
= 5V)
1
1.2
Enable Threshold vs. Input Voltage
Enable Threshold (V)
1.1
1
0.9
0.8
0.7
0.6
0
EN(H)
Variation (%)
-1
-2
-3
-4
-20
0
20
40
60
80
100
EN(L)
2.5
3
3.5
4
4.5
5
5.5
Temperature (°C)
Input Voltage (V)
1155.2006.09.1.7
5
ANALOGICTECH [ ADVANCED ANALOGIC TECHNOLOGIES ]
