MIC26903 Datasheet, PDF (8/31 Pages) Micrel Semiconductor – 28V, 9A Hyper Light Load Synchronous DC/DC Buck Regulator

Micrel, Inc.
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
0.808
0.804
0.800
0.796
V_IN = 12V
V_OUT = 1.8V
0.792
0
1.5
3
4.5
6
7.5
9
OUTPUT CURRENT (A)
Line Regulation
vs. Output Current
1.0%
0.5%
V_IN = 4.5V to 28V
V_OUT = 1.8V
0.0%
-0.5%
-1.0%
0
2
3
5
6
8
9
OUTPUT CURRENT (A)
Switching Frequency
vs. Output Current
700
V_IN = 12V
650
V_OUT = 1.8V
600
550
500
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
V_IN = 5V
3.3V
2.5V
1.8V
1.5V
1.2V
1.0V
0.9V
0.8V
3
6
9
12
OUTPUT CURRENT (A)
IC Power Dissipation (VIN = 5V)
3.0
vs. Output Current
V_IN = 5V
V_OUT = 0.8,V, 1.0V, 1.2V, 1.5V, 1.8V,2.5V, 3.3V
2.5
2.0
1.5
1.0
3.3V
0.8V
0.5
0.0
0
1.5
3
4.5
6
7.5
9
OUTPUT CURRENT (A)
MIC26903
Output Voltage
vs. Output Current
1.819
1.814
1.810
1.805
V_IN = 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)
Output Voltage (V_IN = 5V)
vs. Output Current
5.0
V_IN = 5V
4.6
V_FB < 0.8V
4.2
3.8
TA
25ºC
85ºC
3.4
125ºC
3.0
0
2
4
6
8
10
12
OUTPUT CURRENT (A)
Die Temperature* (V_IN = 5V)
vs. Output Current
100
80
60
40
V_IN = 5V
20
V_OUT = 1.8V
0
0
2
3
5
6
8
9
OUTPUT CURRENT (A)
July 2011
8
M9999-071311-A