Datasheet

MCP1601
DS21762B-page 2  2003-2013 Microchip Technology Inc.
Typical Application
Functional Block Diagram
V
OUT
P
GND
L
X
SHDN
V
IN
1
2
3
4
8
7
6
5
MCP1601
FB
SYNC/
A
GND
Input
Voltage
2.7V-4.2V
C
IN
10 µF
10 µH
C
OUT
10 µF
R
1
250 k
(for 1.8V)
R
2
200 k
Typical Application (2.7V to 4.2V)
I
OUT
= 0 mA to 400 mA
C
OUT
Range
10 µF to 47 µF
L Range
10 µH to 22 µH
C
1
47 pF
V
OUT
Range
1.2V to 3.3V
PWM
+
-
EA
C
COMP
FB
R
COMP
Feedforward Oscillator
K*V
IN
Duty
Clamp
10% - 90%
PWM Latch
R
OUT
Inset
Timing
0.8V
I
SENSE
P
V
REF
S
SQW
V
IN
SHDN
Internal
Circuit
UVLO
Enable Out
A
GND
A
GND
A
GND
PFM Comparator
Internal
Band Gap
Reference
Buffered 0.8V Output
V
REF
SYNC/PWM
V
REF
I
SENSE
P
I
SENSE
N
PFM Mode
Timing
L
X
V
OUT
P
GND
P
GND
Soft Start
I
SENSE
N
Duty
Clamp
800 k
12 pF
10 pF
3M
-
-
+
V
REF
-
-
+
-
+
Enable
Cycle
Cycle