MIC24055 Datasheet, PDF (8/29 Pages) Micrel Semiconductor – 12V, 12A High-Efficiency Buck Regulator

Micrel, Inc.
Typical Characteristics (Continued)
Output Current Limit
vs. Temperature
30
0.808
25
0.804
20
15
0.800
10
5
VIN = 12V
V_OUT = 1.8V
0
-50 -25 0 25 50 75 100 125
TEMPERATURE (°C)
0.796
0.792
0
Feedback Voltage
vs. Output Current
VIN = 12V
V_OUT = 1.8V
2
4
6
8
10 12
OUTPUT CURRENT (A)
MIC24055
1.819
1.814
1.810
1.805
1.800
1.796
1.791
1.787
1.782
0
Output Voltage
vs. Output Current
VIN = 12V
V_OUT = 1.8V
2
4
6
8
10
12
OUTPUT CURRENT (A)
Line Regulation
vs. Output Current
1.0%
0.5%
0.0%
-0.5%
-1.0%
0
VIN = 4.5V to 19V
V_OUT = 1.8V
2
4
6
8
10 12
OUTPUT CURRENT (A)
Switching Frequency
vs. Output Current
700
650
600
550
500
0
VIN = 12V
V_OUT = 1.8V
2
4
6
8
10
12
OUTPUT CURRENT (A)
Output Voltage (VIN = 5V)
vs. Output Current
5.0
VIN = 5V
V_FB < 0.8V
4.6
4.2
3.8
T_A
25ºC
85ºC
125ºC
3.4
3.0
0
3
6
9
12
15
OUTPUT CURRENT (A)
100
95
90
85
80
75
70
65
60
55
50
0
Efficiency (VIN = 5V)
vs. Output Current
3.3V
2.5V
1.8V
1.5V
1.2V
1.0V
0.9V
0.8V
VIN = 5V
3
6
9
12
15
OUTPUT CURRENT (A)
IC Power Dissipation (VIN = 5V)
vs. Output Current
4.0
VIN = 5V
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0.0
0
3
V_OUT = 3.3V
V_OUT = 0.8V
6
9
12
OUTPUT CURRENT (A)
Die Temperature* (VIN = 5V)
vs. Output Current
100
80
60
40
20
0
0
VIN = 5V
V_OUT = 1.8V
2
4
6
8
10
12
OUTPUT CURRENT (A)
Die Temperature* : The temperature measurement was taken at the hottest point on the MIC24055 case mounted on a 5 square inch, 4 layer,
0.62 inch, FR-4 PCB with 2oz finish copper weight per layer, see Thermal Measurement section. Actual results will depend upon the size of the PCB,
ambient temperature and proximity to other heat emitting components.
December 2012
8
M9999-120712-A