MIC26950 Datasheet, PDF (8/27 Pages) Micrel Semiconductor – 12A Hyper Speed Control Synchronous DC-DC Buck Regulator

Micrel, Inc.
MIC26950
Typical Characteristics (Continued)
Efficiency
vs. Output Current
95
6VIN
90
12VIN
85
18VIN
80
24VIN
75
70
65
60
0
VOUT = 1.2V
VDD = 5V
3
6
9
12
OUTPUT CURRENT (A)
0.808
0.806
0.804
0.802
0.800
0.798
0.796
0.794
0.792
0
Feedback Voltage
vs. Output Current
VIN = 12V
VOUT = 1.2V
VDD = 5V
3
6
9
12
OUTPUT CURRENT (A)
0.1%
0.0%
-0.1%
-0.2%
-0.3%
-0.4%
-0.5%
0
Feedback Voltage (%)
vs. Output Current
VIN = 12V
VOUT = 1.2V
VDD = 5V
3
6
9
12
OUTPUT CURRENT (A)
0.5%
0.4%
0.3%
0.2%
0.1%
0.0%
0
Line Regulation
vs. Output Current
VIN = 6V to 26V
VOUT = 1.2V
VDD = 5V
3
6
9
12
OUTPUT CURRENT (A)
390
360
330
300
270
240
210
0
Switching Frequency
vs. Output Current
VIN = 12V
VOUT = 1.2V
VDD = 5V
3
6
9
12
OUTPUT CURRENT (A)
5
4.8
4.6
4.4
4.2
4
3.8
3.6
3.4
0
Output Voltage (VIN = 5V)
vs. Output Current
VIN = 5V
VFB < 0.8V
VDD = 5V
TA
25ºC
85ºC
125ºC
3
6
9
12
15
OUTPUT CURRENT (A)
Die Temperature* (VIN = 5V)
vs. Output Current
100
80
60
40
20
0
0
VIN = 5V
VOUT = 1.2V
VDD= 5V
3
6
9
12
OUTPUT CURRENT (A)
Die Temperature* (VIN = 12V)
vs. Output Current
100
80
60
40
20
0
0
VIN = 12V
VOUT = 1.2V
VDD= 5V
3
6
9
12
OUTPUT CURRENT (A)
Die Temperature* (VIN = 24V)
vs. Output Current
100
80
60
40
20
0
0
VIN = 24V
VOUT = 1.2V
VDD = 5V
3
6
9
12
OUTPUT CURRENT (A)
100
95
90
85
80
75
70
0
Efficiency (VIN = VDD = 5V)
vs. Output Current
3.3V
2.5V
1.8V
1.5V
1.2V
1.0V
0.9V
0.8V
3
6
9
12
15
OUTPUT CURRENT (A)
100
95
90
85
80
75
70
0
Efficiency (VIN = 12V)
vs. Output Current
5.0V
3.3V
2.5V
1.8V
1.5V
1.2V
1.0V
0.9V
0.8V
3
6
9
12
15
OUTPUT CURRENT (A)
95
90
85
80
75
70
0
Efficiency (VIN = 24)
vs. Output Current
5.0V
3.3V
2.5V
1.8V
1.5V
1.2V
1.0V
0.9V
0.8V
3
6
9
12
15
OUTPUT CURRENT (A)
Die Temperature* : The temperature measurement was taken at the hottest point on the MIC26950 case mounted on a 5 square inch PCB; see
Thermal Measurement section. Actual results will depend upon the size of the PCB, ambient temperature and proximity to other heat emitting
components.
September 2010
8
M9999-091710-C