Datasheet

 2003-2013 Microchip Technology Inc. DS21762B-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4kV
† 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 FUNCTION
V
IN
Input Source Voltage
SHDN Device Shutdown Pin
FB Output Voltage Feedback Input
A
GND
Analog Ground
V
OUT
Sensed Output Voltage
SYNC/PWM
Synchronous Clock input or PWM/
PFM select
P
GND
Power Ground
L
X
Output Inductor Node
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
2.7 — 5.5 V I
LOAD
= 0 mA to 500 mA
Shutdown Current I(V
IN
) — 0.05 1.0 µA Shutdown Mode (SHDN = GND)
PFM Mode Current I(V
IN
) — 119 180 µA SYNC/PWM = GND, PFM Mode
(I
LOAD
= 0 mA)
Oscillator Section
Internal Oscillator Frequency F
OSC
650 750 850 kHz SYNC/PWM = V
IN
External Oscillator Capture Range F
SYNC
850 — 1000 kHz F
SYNC
> F
OSC
External Oscillator Duty Cycle F
SYN-FALL
10 — 90 % F
SYNC
= 1 MHz
Internal Power Switches
R
DSon
P-CHANNEL R
DSon-P
— 500 — m I
P
=100 mA, T
A
=+25°C, V
IN
=4.2V
R
DSon
N-CHANNEL R
DSon-N
— 500 — m I
N
=100 mA, T
A
=+25°C, V
IN
=4.2V
Dropout Voltage V
DROPOUT
— 250 — mV V
OUT
= 2.7V, I
LOAD
= 300 mA,
T
A
=+25°C, V
DROPOUT
=97%V
OUT
Pin Leakage Current I
LX
-1.0 — 1.0 µA SHDN = 0V, V
IN
= 5.5V, L
X
= 0V, L
X
=
5.5V
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
0.9 — V
IN
V
Reference Feedback Voltage V
FB
0.78 0.8 0.82 V
Feedback Input Bias Current I
VFB
—0.1—nA
Line Regulation V
LINE-REG
—0.1—%/VV
IN
=2.7V to 5.5V, I
LOAD
=10 mA
Load Regulation V
LOAD-REG
—1.5—%V
IN
= 3.6V,
I
LOAD
= 0 mA to 300 mA
Start-Up Time T
START
— 0.5 — ms PWM Mode, SYNC/PWM=V
IN