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MIC4451YN

12A-Peak Low-Side MOSFET Driver

Micrel 

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 VS

•..Low Supply Current450µA 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

0.1mA

IN

2kΩ

0.3mA

MIC4451

INVERTING

MIC4452

NONINVERTING

OUT

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

January 2011

M9999-011811-A

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