MIC4451_11 Datasheet, PDF (1/14 Pages) Micrel Semiconductor – 12A-Peak Low-Side MOSFET Driver

MIC4451/4452
12A-Peak Low-Side MOSFET Driver
Bipolar/CMOS/DMOS Process
General Description
Features
MIC4451 and MIC4452 CMOS MOSFET drivers are
tough, 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.
• 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 V_S
•..Low Supply Current450µA With Logic 1 Input
•..Low Output Impedance: 1.0Ω
•..Output Voltage Swing to Within 25mV of GND or V_S
• 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
V_S
0.1mA
IN
2kΩ
0.3mA
MIC4451
INVERTING
MIC4452
NONINVERTING
OUT
GND
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel [phone] • fax + 1 [phone] • http://www.micrel.com
January 2011
M9999-011811-A