MIC22405 Datasheet, PDF (8/30 Pages) Micrel Semiconductor – 4A Integrated Switch High-Efficiency Synchronous Buck Regulator

Micrel, Inc.
Typical Characteristics (Continued)
Efficiency
vs. Output Current
100
V_IN =3.3V
95
90
85
V_IN =5.0V
80
75
70
65
60
V_OUT = 1.8V
55
50
0
1
2
3
4
OUTPUT CURRENT (A)
Feedback Voltage
vs. Output Current
0.725
0.715
0.705
0.695
0.685
V_IN = 3.3V
V_OUT = 1.8V
0.675
0
1
2
3
4
OUTPUT CURRENT (A)
Switching Frequency
1100
vs. Output Current
1050
V_IN = 3.3V
V_OUT = 1.8V
I_OUT = 0A
Output Voltage (V_IN = 3.3V)
vs. Output Current
4.3
V_IN = 3.3V
V_FB < 0.8V
3.8
1000
950
900
0
1
2
3
4
OUTPUT CURRENT (A)
100
95
90
85
80
75
70
65
0
Efficiency (V_IN = 3.3V)
vs. Output Current
V_IN = 3.3V
2.5V
1.8V
1.5V
1.2V
1.0V
0.9V
0.8V
0.7V
1
2
3
4
5
6
OUTPUT CURRENT (A)
3.3
T_A
2.8 ^25ºC
85ºC
125ºC
2.3
0
1
2
3
4
OUTPUT CURRENT (A)
IC Power Dissipation (V_IN = 3.3V)
vs. Output Current
1.25
2.5V
1.8V
1.00
1.5V
1.2V
1.0V
0.75
0.9V
0.8V
0.7V
0.50
0.25
0.00
0
V_IN = 3.3V
1
2
3
4
OUTPUT CURRENT (A)
MIC22405
0.06%
0.04%
Line Regulation
vs. Output Current
V_IN = 2.9V to 5.5V
V_OUT = 1.8V
0.02%
0.00%
-0.02%
0
1
2
3
4
OUTPUT CURRENT (A)
Output Voltage (V_IN = 5.0V)
vs. Output Current
6.0
V_IN = 5.0V
V_FB < 0.8V
5.5
5.0
T_A
4.5 ^25ºC
85ºC
125ºC
4.0
0
1
2
3
4
OUTPUT CURRENT (A)
Case Temperature* (V_IN = 3.3V)
vs. Output Current
80
60
40
20
0
0
V_IN = 3.3V
V_OUT = 1.8V
1
2
3
4
OUTPUT CURRENT (A)
June 2011
8
M9999-061511-A