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© 2011 Microchip Technology Inc.
DS22285A-page 7
MCP16321/2
2.0
TYPICAL PERFORMANCE CURVES
Note:
 Unless otherwise indicated, V
IN
= 12V, EN = Floating (Internally pulled up), C
IN
= 20  µF,  C
OUT
= 2x22 µF,
L = 4.7 µH (XAL6060-472MEB), I
LOAD
= 200 mA,  T
A
= +25°C. MCP16321 maximum output current = 1A.
FIGURE 2-1:
5V V
OUT
 Efficiency vs. I
OUT
.
FIGURE 2-2:
3.3V V
OUT
 Efficiency vs. 
I
OUT.
FIGURE 2-3:
2.5V V
OUT
 Efficiency vs. 
I
OUT.
FIGURE 2-4:
1.8V V
OUT
 Efficiency vs. 
I
OUT
.
FIGURE 2-5:
1.5V V
OUT
 Efficiency vs. 
I
OUT.
FIGURE 2-6:
0.9V V
OUT
 Efficiency vs. 
I
OUT.
Note:
The graphs and tables provided following this note are a statistical summary based on a limited number of
samples and are provided for informational purposes only. The performance characteristics listed herein
are not tested or guaranteed. In some graphs or tables, the data presented may be outside the specified
operating range (e.g., outside specified power supply range) and therefore outside the warranted range.
50
55
60
65
70
75
80
85
90
95
100
0.0
0.4
0.8
1.2
1.6
2.0
Efficiency
 (%
)
I
OUT
(A)
V
IN
= 6V
V
IN
= 24V
V
IN
= 18V
V
IN
= 12V
V
OUT
= 5V
50
55
60
65
70
75
80
85
90
95
0
0.4
0.8
1.2
1.6
2
Efficiency
 (%
)
I
OUT
(A)
V
IN
= 24V
V
IN
= 6V
V
IN
= 18V
V
IN
= 12V
V
OUT
= 3.3V
40
50
60
70
80
90
100
0
0.4
0.8
1.2
1.6
2
Efficiency
 (%
)
I
OUT 
(A)
V
IN
= 24V
V
IN
= 6V
V
IN
= 18V
V
IN
= 12V
V
OUT
= 2.5V
40
50
60
70
80
90
100
0
0.4
0.8
1.2
1.6
2
Efficiency
 (%
)
I
OUT
(A)
V
IN
= 6V
V
IN
= 18V
V
IN
= 12V
V
OUT
= 1.8V
40
45
50
55
60
65
70
75
80
85
90
0
0.4
0.8
1.2
1.6
2
Efficiency
 (%
)
I
OUT
(A)
V
IN
= 6V
V
IN
= 18V
V
OUT
= 1.5V
V
IN
= 12V
40
50
60
70
80
90
100
0
0.4
0.8
1.2
1.6
2
Efficiency
 (%
)
I
OUT
(A)
V
IN
= 10V
V
IN
= 6V
V
IN
= 8V
V
OUT
= 0.9V