Microchip Technology ARD00386 Data Sheet
2011 Microchip Technology Inc.
DS22234B-page 7
MCP1640/B/C/D
Note: Unless otherwise indicated,
V
IN
= EN = 1.2V, C
OUT
= C
IN
= 10 µF, L
= 4.7 µH, V
OUT
= 3.3V, I
LOAD
= 15 mA, T
A
= +25°C.
FIGURE 2-13:
Input No Load Current vs.
V
IN
.
FIGURE 2-14:
N-Channel and P-Channel
R
DSON
vs. > of V
IN
or V
OUT
.
FIGURE 2-15:
PFM / PWM Threshold
Current vs. V
IN
.
FIGURE 2-16:
MCP1640 3.3V V
OUT
PFM
Mode Waveforms.
FIGURE 2-17:
MCP1640B 3.3V V
OUT
PWM Mode Waveforms.
FIGURE 2-18:
MCP1640/B High Load
Waveforms.
10
100
1000
10000
0.8
1.1
1.4
1.7
2
2.3
2.6
2.9
3.2
3.5
V
IN
(V)
I
IN
(µ
A
)
V
OUT
= 3.3V
V
OUT
= 5.0V
V
OUT
= 2.0V
V
OUT
= 2.0V
V
OUT
= 3.3V
V
OUT
= 5.0V
PWM / PFM
PWM ONLY
0
1
2
3
4
5
1
1.5
2
2.5
3
3.5
4
4.5
5
> V
IN
or V
OUT
S
w
it
c
h
Re
si
st
an
ce (
O
hm
s)
P - Channel
N - Channel
0
2
4
6
8
10
12
14
16
0
0.5
1
1.5
2
2.5
3
3.5
4
V
IN
(V)
I
OU
T
(m
A
)
V
OUT
= 2.0V
V
OUT
= 3.3V
V
OUT
= 5.0V