MIC22705_11 Datasheet, PDF (8/29 Pages) Micrel Semiconductor – 1MHz, 7A Integrated Switch High-Efficiency Synchronous Buck Regulator

Micrel, Inc.
Typical Characteristics (Continued)
Efficiency
vs. Output Current
100
3.3VIN
95
5.0VIN
90
0.707
0.704
0.700
Feedback Voltage
vs. Output Current
85
VOUT = 1.8V
80
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OUTPUT CURRENT (A)
Switching Frequency
vs. Output Current
1200
1100
1000
900
800
0
V_IN = 5.0V
V_OUT = 1.8V
I_OUT = 0A
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OUTPUT CURRENT (A)
Efficiency (VIN = 3.3V)
vs. Output Current
100
95
90
85
80
VIN = 3.3V
75
70
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OUTPUT CURRENT (A)
2.5V
1.8V
1.5V
1.2V
1.0V
0.9V
0.8V
89
0.697
VIN = 5.0V
VOUT = 1.8V
0.693
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OUTPUT CURRENT (A)
Output Voltage (VIN = 3.3V)
vs. Output Current
3.4
3.3
V_IN = 3.3V
V_FB < 0.7V
3.2
3.1
3.0
2.9
2.8
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OUTPUT CURRENT (A)
IC Power Dissipation vs. Output
Current (VIN = 3.3V)
2
VIN = 3.3V
VOUT = 0.8V, 1.0V, 1.2V, 1.5V, 1.8V, 2.5V
1.5
1
0.5
0
0
2
4
6
OUTPUT CURRENT (A)
MIC22705
0.5%
0.4%
Line Regulation
vs. Output Current
V_IN = 2.9V to 5.5V
V_OUT = 1.8V
0.3%
0.2%
0.1%
0.0%
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OUTPUT CURRENT (A)
Output Voltage (VIN = 5.0V)
vs. Output Current
5.2
5.1
VIN = 5.0V
VFB < 0.7V
5.0
4.9
4.8
4.7
4.6
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OUTPUT CURRENT (A)
Case Temperature* (VIN = 3.3V)
vs. Output Current
100
80
60
40
20
0
0
VIN = 3.3V
VOUT = 1.8V
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OUTPUT CURRENT (A)
March 2011
8
M9999-033111-A