Datasheet

 2004-2013 Microchip Technology Inc. DS21876B-page 5
MCP1650/51/52/53
1.0 ELECTRICAL
CHARACTERISTICS
Absolute Maximum Ratings †
V
IN
TO GND...........................................................6.0V
CS,FB,LBI,LBO
,SHDN,PG,EXT............GND – 0.3V to
V
IN
+ 0.3V
Current at EXT pin ................................................±1A
Storage temperature ..........................-65°C to +150°C
Operating Junction Temperature........-40°C to +125°C
ESD protection on all pins  4kV HBM
† 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.
DC CHARACTERISTICS
Electrical Specifications: Unless otherwise noted, all parameters apply at V
IN
= +2.7V to +5.5V, SHDN =High,
T
J
= -40°C to +125°C. Typical values apply for V
IN
= 3.3V, T
A
+25°C.
Parameters Sym Min Typ Max Units Conditions
Input Characteristics
Supply Voltage V
IN
2.7 — 5.5 V
Undervoltage Lockout
(S Option)
UVLO 2.4 2.55 2.7 V V
IN
rising edge
Under Voltage Lockout
(R Option)
UVLO 1.85 2.0 2.15 V V
IN
rising edge
Undervoltage Hysteresis UVLO
HYST
—117— mV
Shutdown Supply Current I
SHD
— 0.001 1 µA SHDN = GND
Quiescent Supply Current I
Q
— 120 220 µA EXT = Open
Soft Start Time T
SS
—500— µs
Feedback Characteristics
Feedback Voltage V
FB
1.18 1.22 1.26 V All conditions
Feedback Comparator
Hysteresis
V
HYS
—1223mV
Feedback Input Bias Current I
FBlk
-50 — 50 nA V
FB
< 1.3V
Current Sense Input
Current Sense Threshold I
SNS-TH
75 114 155 mV
Delay from Current Sense to
Output
T
dly_ISNS
—80— ns
Ext Drive
EXT Driver ON Resistance
(High Side)
R
HIGH
—818 
EXT Driver ON Resistance
(Low Side)
R
LOW
—412 
Oscillator Characteristics
Switching Frequency F
OSC
650 750 850 kHz
Low Duty Cycle Switch-Over
Voltage
V
LowDuty
—3.8— VV
IN
rising edge
Duty Cycle Switch Voltage
Hysteresis
DC
Hyst
—92— mV
Low Duty Cycle DC
LOW
50 56 62 %
High Duty Cycle DC
HIGH
72 80 88 %