
2003 Microchip Technology Inc.
DS21762A-page 3
MCP1601
1.0
ELECTRICAL
CHARACTERISTICS
Absolute Maximum Ratings
V
IN
- A
GND
......................................................................6.0V
SHDN, FB, SYNC/PWM, V
OUT
.....(A
GND
-0.3V) to (V
IN
+0.3V)
L
X
to P
GND
................................................ -0.3V to (V
IN
+0.3V)
P
GND
to A
GND
..................................................-0.3V to +0.3V
Output Short Circuit Current .................................continuous
Storage temperature .....................................-65
°
C to +150
°
C
Ambient Temp. with Power Applied ................-40
°
C to +85
°
C
Operating Junction Temperature...................-40
°
C to +125
°
C
ESD protection on all pins
..................................................≥
4 kV
Notice:
Stresses above those listed under
“
Maximum rat-
ings
”
may cause permanent damage to the device. This is a
stress rating only and functional operation of the device at
those or any other conditions above those indicated in the
operational listings of this specification is not implied. Expo-
sure to maximum rating conditions for extended periods may
affect device reliability.
PIN FUNCTION TABLE
NAME
V
IN
SHDN
FB
A
GND
V
OUT
FUNCTION
Input Source Voltage
Device Shutdown Pin
Output Voltage Feedback Input
Analog Ground
Sensed Output Voltage
Synchronous Clock input or PWM/
PFM select
Power Ground
Output Inductor Node
SYNC/PWM
P
GND
L
X
ELECTRICAL SPECIFICATIONS
Electrical Specifications:
Unless otherwise indicated, V
IN
=4.2V, V
OUT
=1.8V, I
LOAD
= 10 mA, T
A
=-40
°
C to +85
°
C.
Parameters
Sym
Min
Typ
Max
Units
Conditions
Power Input Requirements
Voltage
V
IN
I(V
IN
)
I(V
IN
)
2.7
—
5.5
V
I
LOAD
= 0 mA to 500 mA
Shutdown Mode (SHDN = GND)
Shutdown Current
—
0.05
1.0
μA
PFM Mode Current
—
119
180
μA
SYNC/PWM = GND, PFM Mode
(I
LOAD
= 0 mA)
Oscillator Section
Internal Oscillator Frequency
F
OSC
F
SYNC
F
SYN-FALL
650
750
850
kHz
SYNC/PWM = V
IN
F
SYNC
> F
OSC
F
SYNC
= 1 MHz
External Oscillator Capture Range
850
—
1000
kHz
External Oscillator Duty Cycle
10
—
90
%
Internal Power Switches
R
DSon
P-CHANNEL
R
DSon
N-CHANNEL
Dropout Voltage
R
DSon-P
R
DSon-N
V
DROPOUT
—
500
—
m
m
I
P
=100 mA, T
A
=+25
°
C, V
IN
=4.2V
I
N
=100 mA, T
A
=+25
°
C, V
IN
=4.2V
V
OUT
= 2.7V, I
LOAD
= 300 mA,
T
A
=+25
°
C, V
DROPOUT
=97%V
OUT
SHDN = 0V, V
IN
= 5.5V, L
X
= 0V, L
X
=
5.5V
—
500
—
—
250
—
mV
Pin Leakage Current
I
LX
-1.0
—
1.0
μA
Output PWM Mode
Peak Current Limit
I
PEAK-PWM
—
1.0
—
A
PWM Mode, SYNC/PWM = V
IN,
T
A
=
+25
°
C
Output Voltage
Output Voltage Range
V
OUT
V
FB
I
VFB
V
LINE-REG
V
LOAD-REG
0.9
—
V
IN
0.82
V
Reference Feedback Voltage
0.78
0.8
V
Feedback Input Bias Current
—
0.1
—
nA
Line Regulation
—
0.1
—
%/V
V
IN
=2.7V to 5.5V, I
LOAD
=10 mA
V
IN
= 3.6V,
I
LOAD
= 0 mA to 300 mA
PWM Mode, SYNC/PWM=V
IN
Load Regulation
—
1.5
—
%
Start-Up Time
T
START
—
0.5
—
ms