MIC4451/4452
12A-Peak Low-Side MOSFET Driver
Bipolar/CMOS/DMOS Process
General Description
Features
MIC4451 and MIC4452 CMOS MOSFET drivers are
robust, efficient, and easy to use. The MIC4451 is an
inverting driver, while the MIC4452 is a non-inverting
driver.
Both versions are capable of 12A (peak) output and can
drive the largest MOSFETs with an improved safe
operating margin. The MIC4451/4452 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.
MIC4451/4452 drivers can replace three or more discrete
components, reducing PCB area requirements, simplifying
product design, and reducing assembly cost.
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.
Data sheets and support documentation can be found on
Micrel’s web site at: www.micrel.com.
• 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: 12A peak
• Wide operating range: 4.5V to 18V
• High capacitive load drive: 62,000Pf
• Low delay time: 30ns (typ.)
• Logic high input for any voltage from 2.4V to VS
• Low supply current 450µA with logic 1 input
• Low output impedance: 1.0Ω
• Output voltage swing to within 25mV of GND or VS
• Low equivalent input capacitance (typ.): 7pF
Applications
• Switch mode power supplies
• Motor controls
• Pulse transformer driver
• Class-D switching amplifiers
• Line drivers
• Driving MOSFET or IGBT parallel chip modules
• Local power ON/OFF switch
• Pulse generators
____________________________________________________________________________________________________________
Functional Diagram
VS
0.3mA
MIC4451
INVERTING
0.1mA
OUT
IN
2kΩ
MIC4452
NONINVERTING
GND
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-01200 • fax + 1 (408) 474-1000 • http://www.micrel.com
October 2011
M9999-103111-B
