Datasheet

MCP16323
DS22284A-page 4 © 2011 Microchip Technology Inc.
PFM Mode Feedback
Comparator Threshold
V
FB-PFM
—V
OUT
+ 1% — V
Feedback Input Bias
Current
I
FB
—100 —nA
EN Input Characteristics
EN Input Logic High V
IH
2.2 ——V
EN Input Logic Low V
IL
—— 0.8 V
EN Input Hysteresis V
EN-HYST
—480 —mV
EN Input Leakage Current I
ENLK
—3.5 —µAV
EN
= 5V
—-1.5 —µAV
EN
= 0V
Soft-Start Time t
SS
—4 —ms
Switching Characteristics
Switching Frequency f
SW
0.9 1 1.1 MHz Open Loop V
FB
Low
Maximum Duty Cycle DC
MAX
95 97 99 % Open Loop V
FB
Low
Note 1
Minimum Duty Cycle — 7 — %
NMOS Low-Side
Switch On Resistance
Low-Side R
DS(ON)
—120 —mΩ
NMOS High-Side
Switch On Resistance
High-Side
R
DS(ON)
—180 —mΩ
NMOS High-Side
Switch Current Limit
I
N(MAX)
3.4 3.8 4.4 A MCP16323
PG Output Characteristics
PG Low-level
Output Voltage
PG
IL
——0.01 VI
PG
= -0.3 mA
PG High-Level Output
Leakage Current
I
PGLK
—0.5 —µAV
PG
= 5V
PG Release Timer t
PG
—10 —ms
V
OUT
Undervoltage
Threshold
V
OUT-UV
91% V
OUT
93% V
OUT
95% V
OUT
V
OUT
Undervoltage
Hysteresis
V
OUT-UV_HYST
—1.5%V
OUT
—
V
OUT
Overvoltage Thresh-
old
V
OUT-OV
—103%V
OU
T
—
V
OUT
Overvoltage
Hysteresis
V
OUT-OV_HYST
—1%V
OUT
—
Thermal Characteristics
Thermal Shutdown
Die Temperature
T
SD
—170 —°C
Die Temperature
Hysteresis
T
SDHYS
—10 —°C
DC CHARACTERISTICS (CONTINUED)
Electrical Characteristics: Unless otherwise indicated, T
A
= +25°C, V
IN
=12V, V
OUT
= 3.3V, I
OUT
= 300 mA,
L=4.7µH, C
OUT
=2x22µF, C
IN
=2x10µF. Boldface specifications apply over the T
J
range of -40°C to +125°C.
Parameters Sym Min Typ Max Units Conditions
Note 1: Regulator SW pin is forced off for 240 ns every 8 cycles to ensure the BOOST cap is replenished.
2: As a result of the maximum duty cycle limitations, 3A of output current for 5V output conditions may not
regulate the voltage. External component selection may have an impact on this. A minimum input voltage
of 6.5V is recommended.