Datasheet

 2007-2012 Microchip Technology Inc. DS22042B-page 9
MCP1603/B/L
Note: Unless otherwise indicated, MCP1603/L, V
IN
= SHDN =3.6V, C
OUT
=C
IN
= 4.7 µF, L = 4.7 µH,
V
OUT
(ADJ) = 1.8V, I
LOAD
= 100 mA, T
A
= +25°C. Adjustable or fixed output voltage options can be used to generate the
Typical Performance Characteristics.
FIGURE 2-13: Efficiency vs. Input Voltage
(V
OUT
= 3.3V).
FIGURE 2-14: Efficiency vs. Output Load
(V
OUT
= 3.3V).
FIGURE 2-15: PWM-Only Device Minimum
Load for Regulation (MCP1603B).
FIGURE 2-16: Switching Frequency vs.
Ambient Temperature.
FIGURE 2-17: Switching Frequency vs.
Input Voltage.
FIGURE 2-18: Switch Resistance vs. Input
Voltage.
90.0
92.5
95.0
97.5
100.0
Efficiency (%)
V
OUT
= 3.3V
I
OUT
= 100 mA
I
OUT
= 500 mA
I
OUT
= 300 mA
85.0
87.5
3.5 3.75 4 4.25 4.5 4.75 5 5.25 5.5
Input Voltage (V)
40
50
60
70
80
90
100
E
fficiency (%)
V
IN
= 4.2V
V
IN
= 3.6V
0
10
20
30
0.1 1 10 100 1000
E
Output Current (mA)
V
OUT
= 3.3
V
PFM/PWM
PWM Only
3
4
5
6
7
8
9
10
o
ad Current (mA)
T
A
= -40
o
C
T
A
= +25
o
C
T
A
=+85
o
C
Regulation
0
1
2
3
1.8 2 2.2 2.4 2.6 2.8 3 3.2 3.4 3.6
L
o
V
IN
-V
OUT
(V)
T
A
= +85
C
No Regulation
2.05
2.10
2.15
2.20
h
ing Frequency (MHz)
1.95
2.00
-40 -25 -10 5 20 35 50 65 80 95 110 125
Switc
h
Ambient Temperature (
o
C)
200
2.05
2.10
2.15
2.20
h
ing Frequency (MHz)
1.95
2
.
00
2.7 3.05 3.4 3.75 4.1 4.45 4.8 5.15 5.5
Switc
h
Input Voltage (V)
0.45
0.50
0.55
0.60
0.65
tch Resistance ()
N-Channel
P-Channel
0.35
0.40
2.7 3.05 3.4 3.75 4.1 4.45 4.8 5.15 5.5
Swit
Input Voltage (V)