July 2005

1

MIC4451/4452

MIC4451/4452

Micrel, Inc.

General Description

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 mar-

gin. The MIC4451/4452 accepts any logic input from 2.4V to

V

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 MOS-

FET 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.

Features

• 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 Current .............. 450µA 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

IN

OUT

MIC4451

INVERTING

MIC4452

NONINVERTING

0.1mA

0.3mA

2kΩ

GND

MIC4451/4452

12A-Peak Low-Side MOSFET Driver

Bipolar/CMOS/DMOS Process

Micrel, Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com