MIC2174 Datasheet, PDF (5/24 Pages) Micrel Semiconductor – 300kHz, Synchronous Buck Controller 300kHz, Synchronous Buck Controller

Micrel, Inc.
Typical Characteristics
12V to 3.3V Efficiency
100
95
90
85
80
75
70
65
60
55
50
0
VIN=5V
2
4
6
8
10
OUTPUT CURRENT (A)
Feedback Voltage vs. Load
0.85
0.84
0.83
0.82
0.81
0.80
0.79
0.78
0.77
0.76
0.75
0
VIN=5V
2
4
6
8
10
OUTPUT CURRENT (A)
0.810
0.808
0.806
0.804
0.802
0.800
0.798
0.796
0.794
0.792
0.790
-40
Feedback Voltage
vs. Temperature
VIN=5V
-20 0 20 40 60 80 100 120
TEMPERATURE (°C)
350
340
330
320
310
300
290
280
270
260
250
3
Switching Frequency
vs. HSD Voltage
VIN=5V
VOUT=1.8V
7 11 15 19 23 27 31 35 39
HSD VOLTAGE (V)
September 2009
24V to 1.8V Efficiency
90
85
80
75
70
65
60
55
50
45
40
0
VIN=5V
2
4
6
8
10
OUTPUT CURRENT (A)
Feedback Voltage
vs. Input Voltage
0.85
0.84
0.83
0.82
0.81
0.80
0.79
0.78
0.77
0.76
0.75
3
3.5
4
4.5
5
5.5
INPUT VOLTAGE (V)
350
340
330
320
310
300
290
280
270
260
250
0
Switching Frequency
vs. Load
VHSD=24V
VIN=5V
VOUT=3.3V
2
4
6
8
10
OUTPUT CURRENT (A)
350
340
330
320
310
300
290
280
270
260
250
-40
Switching Frequency
vs. Temperature
VIN=5V
-20 0 20 40 60 80 100 120
TEMPERATURE (°C)
5
MIC2174
24V to 3.3V Efficiency
90
85
80
75
70
65
60
55
50
45
40
0
VIN=5V
2
4
6
8
10
OUTPUT CURRENT (A)
0.85
0.84
0.83
0.82
0.81
0.80
0.79
0.78
0.77
0.76
0.75
3
Feedback Voltage
vs. HSD Voltage
VIN=5V
7 11 15 19 23 27 31 35 39
HSD VOLTAGE (V)
350
340
330
320
310
300
290
280
270
260
250
3
Switching Frequency
vs. Input Voltage
VHSD=24V
VOUT=3.3V
3.5
4
4.5
5
5.5
INPUT VOLTAGE (V)
Current Limit Threshold vs.
Feedback Voltage Percentage
150
135
120
105
90
75
60
45
30
15
0
0 10 20 30 40 50 60 70 80 90 100
Feedback Voltage Percentage (%)
M9999-090409-B