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MIC4681YM Datasheet(PDF) 9 Page - Micrel Semiconductor

Part # MIC4681YM
Description  2A-Peak SuperSwitcher SOP-8 Buck Regulator
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Manufacturer  MICREL [Micrel Semiconductor]
Direct Link  http://www.micrel.com
Logo MICREL - Micrel Semiconductor

MIC4681YM Datasheet(HTML) 9 Page - Micrel Semiconductor

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April 2005
9
MIC4681
MIC4681
Micrel
Bode Plots
The following bode plots show that the MIC4681 is stable over all conditions using a 68
µF inductor (L) and a 220µF output
capacitor (C
OUT). To assure stability, it is a good practice to maintain a phase margin of greater than 35°.
No-Load Stability
Phase Margin = 94
°
V
IN = 7V
V
OUT = 5.0V
I
OUT = 0A
Amb = 22
°C
L = 68
µF
C
OUT = 220µF
Full-Load Stability
Phase Margin = 74
°
V
IN = 7V
V
OUT = 5.0V
I
OUT = 1.1A
Amb = 22
°C
L = 68
µF
C
OUT = 220µF
No-Load Stability
Phase Margin = 102
°
V
IN = 12V
V
OUT = 5.0V
I
OUT = 0A
Amb = 22
°C
L = 68
µF
C
OUT = 220µF
Full-Load Stability
Phase Margin = 59
°
V
IN = 30V
V
OUT = 5.0V
I
OUT = 1.1A
Amb = 22
°C
L = 68
µF
C
OUT = 220µF
No-Load Stability
Phase Margin = 118
°
V
IN = 30V
V
OUT = 5.0V
I
OUT = 0A
Amb = 22
°C
L = 68
µF
C
OUT = 220µF
Full-Load Stability
Phase Margin = 53
°
V
IN = 12V
V
OUT = 5.0V
I
OUT = 1.4A
Amb = 22
°C
L = 68
µF
C
OUT = 220µF


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