Datasheet

© 2011 Microchip Technology Inc. DS22285A-page 3
MCP16321/2
1.0 ELECTRICAL
CHARACTERISTICS
Absolute Maximum Ratings†
V
IN
.................................................................... -0.3V to 26.4V
SW ...................................................................... -1V to 26.4V
BOOST – GND ........................................... -0.3V to (V
IN
+6V)
EN,V
FB
, PG Voltage.............................................. -0.3V to 6V
Continuous Total Power Dissipation .......................................
...................................................See Thermal Characteristics
Storage Temperature ....................................-65°C to +150°C
Operating Junction Temperature...................-40°C to +125°C
ESD Protection On All Pins:
HBM ......................................................................... 3 kV
MM ..........................................................................200V
† Notice: Stresses above those listed under “Absolute
Maximum Ratings” 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 sections of this
specification is not intended. Exposure to maximum
rating conditions for extended periods may affect
device reliability.
DC CHARACTERISTICS
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
V
IN
Supply Voltage
Input Voltage V
IN
6.0 — 24 V
Quiescent Current
(Switching)
I
Q
—5.2 —mAI
OUT
= 0 mA
Quiescent Current
(Non-Switching)
I
Q
— 2.3 — mA Closed Loop in
Overvoltage
I
OUT
= 0 mA
Quiescent Current -
Shutdown
I
Q
—5 10 µA EN = 0
V
IN
Undervoltage Lockout
Undervoltage Lockout Start UVLO
STRT
5.5 5.75 6.0 VV
IN
Rising
Undervoltage Lockout
Hysteresis
UVLO
HYS
— 0.65 — V Non-Switching
Output Characteristics
Maximum Output Current
MCP16321
I
OUT
1 ——AV
IN
= 6V to 24V
Maximum Output Current
MCP16322
I
OUT
2 ——AV
IN
= 6V to 24V
Output Voltage Adjust Range V
OUT
0.9 — 5.0 V
Output Voltage Tolerance
in PWM Mode
V
OUT-PWM
V
OUT
-2% V
OUT
V
OUT
+2% VI
OUT
= 1A
Output Voltage Tolerance
in PFM Mode
V
OUT-PFM
V
OUT
-1% V
OUT
+1% V
OUT
+3.5% VI
OUT
= 0A
Feedback Voltage V
FB
0.886 0.9 0.914 V
Feedback Reference
To leranc e
V
FB-TOL
-1.5 — 1.5 %
PFM Mode Feedback
Comparator Threshold
V
FB-PFM
—V
OUT
+ 1% — V
Feedback Input Bias
Current
I
FB
—100 —nA
Note 1: Regulator SW pin is forced off for 240 ns every 8 cycles to ensure the BOOST cap is replenished.