MIC4421/4422 Micrel, Inc. MIC4421/4422
9A-Peak Low-Side MOSFET Driver Bipolar/CMOS/DMOS Process
General Description Features MIC4421 and MIC4422 MOSFET drivers are rugged, efficient, and easy to use. The MIC4421 is an inverting driver,
while the MIC4422 is a non-inverting driver. BiCMOS/DMOS Construction Latch-Up Proof: Fully Isolated Process is Inherently
Immune to Any Latch-up. Input Will Withstand Negative Swing of Up to 5V Matched Rise and Fall Times . 25ns High Peak Output Current .9A Peak Wide Operating Range . 4.5V to 18V High Capacitive Load Drive . 47,000pF Low Delay Time .30ns Typ. Logic High Input for Any Voltage from 2.4V to VS Low Equivalent Input Capacitance (typ) . 7pF Low Supply Current . 450ВµA With Logic 1 Input Low Output Impedance .1.5О© Output Voltage Swing to Within 25mV of GND or VS Both versions are capable of 9A (peak) output and can drive
the largest MOSFETs with an improved safe operating margin. The MIC4421/4422 accepts any logic input from 2.4V to
VS without external speed-up capacitors or resistor networks.
Proprietary circuits allow the input to swing negative by as
much as 5V without damaging the part. Additional circuits
protect against damage from electrostatic discharge.
MIC4421/4422 drivers can replace three or more discrete
components, reducing PCB area requirements, simplifying
product design, and reducing assembly cost. Applications Modern Bipolar/CMOS/DMOS construction guarantees
freedom from latch-up. The rail-to-rail swing capability of
CMOS/DMOS insures adequate gate voltage to the MOSFET during power up/down sequencing. Since these devices
are fabricated on a self-aligned process, they have very low
crossover current, run cool, use little power, and are easy
to drive. Switch Mode Power Supplies
Motor Controls
Pulse Transformer Driver
Class-D Switching Amplifiers
Line Drivers
Driving MOSFET or IGBT Parallel Chip Modules …
