Datasheet

 2010 Microchip Technology Inc. DS22234A-page 7
MCP1640/B/C/D
Note: Unless otherwise indicated, V
IN
= EN = 1.2V, C
OUT
=C
IN
=10µF, L =4.7µH, V
OUT
=3.3V, I
LOAD
=15mA, 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
(µA)
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
Switch Resistance (Ohms)
P - Channel
N - Channel
0
2
4
6
8
10
12
14
16
00.511.522.533.54
V
IN
(V)
I
OUT
(mA)
V
OUT
= 2.0V
V
OUT
= 3.3V
V
OUT
= 5.0V