Datasheet

MCP1623/24
DS41420C-page 6 © 2011 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: MCP1623 Efficiency vs.
I
OUT
, V
OUT
= 2.0V.
FIGURE 2-8: MCP1623 Efficiency vs.
I
OUT
, V
OUT
= 3.3V.
FIGURE 2-9: MCP1623 Efficiency vs.
I
OUT
, V
OUT
= 5.0V.
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: MCP1623 PWM Pulse
Skipping Mode Threshold vs. I
OUT
.
0
10
20
30
40
50
60
70
80
90
100
0.01 0.1 1 10 100 1000
I
OUT
(mA)
V
IN
= 1.6V
V
IN
= 0.8V
V
IN
= 1.2V
Efficiency (%)
0
10
20
30
40
50
60
70
80
90
100
0.01 0.1 1 10 100 1000
I
OUT
(mA)
V
IN
= 2.5V
V
IN
= 0.8V
V
IN
= 1.2V
Efficiency (%)
0
10
20
30
40
50
60
70
80
90
100
0.01 0.1 1 10 100 1000
I
OUT
(mA)
V
IN
= 3.6V
V
IN
= 1.2V
V
IN
= 1.8V
Efficiency (%)
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