MIC26903ZA_14 Datasheet, PDF (8/29 Pages) Micrel Semiconductor – 28V, 9A Hyper Speed Control Synchronous DC/DC Buck Regulator

Micrel, Inc.
MIC26903-ZA
Typical Characteristics (Continued)
Efficiency
vs. Output Current
100
12V_IN
90
80
24V_IN
70
60
V_OUT = 1.8V
50
0
1.5
3
4.5
6
7.5
9
OUTPUT CURRENT (A)
Feedback Voltage
vs. Output Current
0.608
0.604
0.600
0.596
VIN = 12V
VOUT = 1.8V
0.592
0
1.5
3
4.5
6
7.5
9
OUTPUT CURRENT (A)
Output Voltage
vs. Output Current
1.819
1.814
1.810
1.805
VIN = 12V
VOUT = 1.8V
1.800
1.796
1.791
1.787
1.782
0
1.5
3
4.5
6
7.5
9
OUTPUT CURRENT (A)
Line Regulation
vs. Output Current
1.0%
0.5%
VIN = 4.5V to 28V
VOUT = 1.8V
0.0%
-0.5%
-1.0%
0
1.5
3
4.5
6
7.5
9
OUTPUT CURRENT (A)
100
95
90
85
80
75
70
65
60
55
50
0
Efficiency (V_IN = 5V)
vs. Output Current
3.3V
2.5V
1.8V
1.5V
1.2V
1.0V
0.9V
0.8V
VIN = 5V
2
4
6
8
10
12
OUTPUT CURRENT (A)
Switching Frequency
vs. Output Current
700
VIN = 12V
650
VOUT = 1.8V
600
550
500
0
2
4
6
8
10
OUTPUT CURRENT (A)
IC Power Dissipation (V_IN = 5V)
vs. Output Current
4.0
3.5
V_IN = 5V
V_OUT = 0.8V, 1.0V, 1.2V, 1.5V, 1.8V, 2.5V, 3.3V
3.0
2.5
2.0
1.5
1.0
0.5
0.0
0
1.5
3
4.5
6
7.5
9
OUTPUT CURRENT (A)
Output Voltage (V_IN = 5V)
vs. Output Current
5.0
V_IN = 5V
V_FB < 0.6V
4.6
4.2
3.8
3.4
3.0
0
T_A
25ºC
85ºC
125ºC
2
4
6
8
10
12
OUTPUT CURRENT (A)
Die Temperature* (V_IN = 5V)
vs. Output Current
100
80
60
40
VIN = 5V
20
VOUT = 1.8V
0
0
1.5
3
4.5
6
7.5
9
OUTPUT CURRENT (A)
Die Temperature* : The temperature measurement was taken at the hottest point on the MIC26903-ZA while it was case mounted on a 5in² 4-layer,
0.62”, FR-4 PCB, with 2oz finish copper weight per layer. See the “Thermal Measurements” section for more details. Actual results will depend on the
size of the PCB, ambient temperature, and proximity to other heat emitting components.
July 22, 2014
8
Revision 1.1