MCP1640/B/C/D
Note: Unless otherwise indicated, V = EN = 1.2V, C
= C = 10 µF, L = 4.7 µH, V
= 3.3V, I
= 15 mA, T = +25°C.
IN
OUT
IN
OUT
LOAD A
10000
PWM / PFM
PWM ONLY
VOUT = 5.0V
1000
100
10
VOUT = 3.3V
VOUT = 2.0V
VOUT = 3.3V
VOUT = 5.0V
VOUT = 2.0V
0.8 1.1 1.4 1.7
2
2.3 2.6 2.9 3.2 3.5
VIN (V)
FIGURE 2-13:
Input No Load Current vs.
FIGURE 2-16:
MCP1640 3.3V VOUT PFM
VIN.
Mode Waveforms.
5
4
P - Channel
3
2
1
0
N - Channel
1.5
1
2
2.5
3
3.5
4
4.5
5
> VIN or VOUT
FIGURE 2-14:
N-Channel and P-Channel
FIGURE 2-17:
MCP1640B 3.3V VOUT
R
DSON vs. > of VIN or VOUT
.
PWM Mode Waveforms.
16
14
12
10
8
VOUT = 5.0V
VOUT = 3.3V
VOUT = 2.0V
6
4
2
0
0
0.5
1
1.5
2
2.5
3
3.5
4
VIN (V)
FIGURE 2-15:
PFM / PWM Threshold
FIGURE 2-18:
MCP1640/B High Load
Current vs. VIN.
Waveforms.
2010 Microchip Technology Inc.
DS22234A-page 7
MICROCHIP [ MICROCHIP ]
