Datasheet

MCP1640/B/C/D
DS22234A-page 6  2010 Microchip Technology Inc.
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 2-7: 3.3V V
OUT
vs. Ambient
Temperature.
FIGURE 2-8: 3.3V V
OUT
vs. Ambient
Temperature.
FIGURE 2-9: 3.3V V
OUT
vs. V
IN
.
FIGURE 2-10: Minimum Start-up and
Shutdown V
IN
into Resistive Load vs. I
OUT
.
FIGURE 2-11: F
OSC
vs. Ambient
Temperature.
FIGURE 2-12: PWM Pulse Skipping Mode
Threshold vs. I
OUT
.
3.285
3.29
3.295
3.3
3.305
3.31
3.315
3.32
3.325
3.33
-40 -25 -10 5 20 35 50 65 80
Ambient Temperature (°C)
V
OUT
(V)
I
OUT
= 15 mA
V
IN
= 0.8V
V
IN
= 1.8V
V
IN
= 1.2V
3.26
3.28
3.30
3.32
3.34
3.36
3.38
-40 -25 -10 5 20 35 50 65 80
Ambient Temperature (°C)
V
OUT
(V)
I
OUT
= 15 mA
V
IN
= 1.5V
I
OUT
= 50 mA
I
OUT
= 5 mA
3.20
3.24
3.28
3.32
3.36
3.40
0.8 1.2 1.6 2 2.4 2.8
V
IN
(V)
V
OUT
(V)
T
A
= - 40°C
I
OUT
= 5 mA
T
A
= 25°C
T
A
= 85°C
0.25
0.40
0.55
0.70
0.85
1.00
0 20406080100
I
OUT
(mA)
V
IN
(V)
Startup
Shutdown
V
OUT
= 3.3V
480
485
490
495
500
505
510
515
520
525
-40 -25 -10 5 20 35 50 65 80
Ambient Temperature (°C)
Switching Frequency (kHz)
V
OUT
= 3.3V
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
012345678910
I
OUT
(mA)
V
IN
(V)
V
OUT
= 3.3V
V
OUT
= 5.0V
V
OUT
= 2.0V