MIC2171 Datasheet, PDF (4/10 Pages) Micrel Semiconductor – 100kHz 2.5A Switching Regulator Preliminary Information

MIC2171
Typical Performance Characteristics
Minimum
Operating Voltage
2.9
2.8
2.7
2.6
Switch Current = 2A
2.5
2.4
2.3
-100 -50 0 50 100 150
Temperature (°C)
Feedback Bias Current
800
700
600
500
400
300
200
100
0
-100 -50 0 50 100 150
Temperature (°C)
Supply Current
15
14
ISW = 0
13
12
D.C. = 90%
11
10
D.C. = 50%
9
8
D.C. = 0%
7
6
5
0
10
20
30
40
V_IN Operating Voltage (V)
Switch On-Voltage
1.6
1.4
1.2
TJ = 25°C
1.0 TJ = –40°C
0.8
0.6
0.4
TJ = 125°C
0.2
0
0
1
2
3
Switch Current (A)
Supply Current
50
40
30
δ = 90%
20
δ = 50%
10
0
0
1
2
3
4
Switch Current (A)
Oscillator Frequency
120
110
100
90
80
70
60
-50
0
50 100 150
Temperature (°C)
Error Amplifier Gain
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0.0
-100 -50 0 50 100 150
Temperature (°C)
7000
6000
5000
4000
3000
2000
1000
0
1
Error Amplifier Gain
10 100 1000 10000
Frequency (kHz)
4-6
Micrel
Feedback Voltage
Line Regulation
5
4
3
TJ = 125°C
2
1
0
TJ = 25°C
-1
-2
-3
-4
TJ = -40°C
-5
0
10
20
30
40
V_IN Operating (V)
Supply Current
10
9 ^V_COMP ^{= 0.6V}
8
7
6
5
4
3
2
1
0
-100 -50 0 50 100 150
Temperature (°C)
Current Limit
8
6
–40°C ^25°C
4
2
125°C
0
0 20 40 60 80 100
Duty Cycle (%)
Error Amplifier Phase
-30
0
30
60
90
120
150
180
210
1
10 100 1000 10000
Frequency (kHz)
1997