MIC4451/4452

12A-Peak Low-Side MOSFET Driver

Bipolar/CMOS/DMOS Process

Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (

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 margin. The MIC4451/4452 accepts any logic

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.

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)

•..Low Supply Current450µA With Logic 1 Input

•..Low Output Impedance: 1.0Ω

• 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

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Functional Diagram

IN

OUT

MIC4451

INVERTING

MIC4452

NONINVERTING

0.1mA

0.3mA

2kΩ

GND

January 2011

M9999-011811-A