mic3172 Micrel Semiconductor, mic3172 Datasheet - Page 6

• Manufacturer Part Number: mic3172
• Description: 100khz 1.25a Switching Regulators
• Manufacturer: Micrel Semiconductor

MIC2172/3172
Typical Performance Characteristics
M9999-042205
2.9
2.8
2.7
2.6
2.5
2.4
2.3
15
14
13
12
11
10
50
40
30
20
10
10
-100
-100
9
8
7
6
5
0
9
8
7
6
5
4
3
2
1
0
0.0
0
V
Switch Current = 1A
COMP
V
-50
-50
MIC2172 Minimum
Operating Voltage
IN
D.C. = 50%
0.5
Supply Current
D.C. = 90%
10
Supply Current
δ = 90%
Supply Current
Switch Current (A)
D.C. = 0%
Temperature (°C)
Temperature (°C)
Operating Voltage (V)
= 0.6V
0
0
1.0
20
50
50
δ = 50%
1.5
30
I SW = 0
100
100
150
150
2.0
40
800
700
600
500
400
300
200
100
120
110
100
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0.0
90
80
70
60
-100
-100
0
8
7
6
5
4
3
2
1
0
-50
0.0
Feedback Bias Current
T J = 25°C
MIC3172
V
Oscillator Frequency
IN
-50
-50
Switch ON Voltage
(Shutdown Mode)
= 40V
Supply Current
Switch Current (A)
0
Temperature (°C)
Temperature (°C)
Temperature (°C)
0.5
0
0
6
T J = –40°C
50
T
50
50
J
1.0
= 125°C
100
100
100
150
150
150
1.5
140
130
120
110
100
90
-1
-2
-3
-4
-5
1.4
1.3
1.2
1.1
0.9
0.8
5
4
3
2
1
0
0
-100
1
4
3
2
1
0
1
0
25°C
Oscillator Frequency
MIC3172
Feedback Voltage
Enable Thresholds
-50
Line Regulation
20
10
T J = -40°C
V
–40°C
Temperature (°C)
IN
Current Limit
10
Duty Cycle (%)
125°C
Operating (V)
R
40
ADJ
0
20
OFF
T J = 125°C
ON
(kΩ)
50
60
MIC2172
100
T J = 25°C
30
100
80
Micrel, Inc.
1000
April 2005
40
150
100