MIC4421A 데이터 시트보기 (PDF) - Master Instrument Corporation

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MIC4421A

9A Peak Low-Side MOSFET Driver Bipolar/CMOS/DMOS Process

Master Instrument Corporation 

MIC4421A/4422A

9A Peak Low-Side MOSFET Driver

Bipolar/CMOS/DMOS Process

General Description

Features

MIC4421A and MIC4422A MOSFET drivers are rugged,

efficient, and easy to use. The MIC4421A is an inverting

driver, while the MIC4422A is a non-inverting driver.

Both versions are capable of 9A (peak) output and can

drive the largest MOSFETs with an improved safe

operating margin. The MIC4421A/4422A 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.

• High peak-output current: 9A Peak (typ.)

• Wide operating range: 4.5V to 18V (typ.)

• Minimum pulse width: 50ns

• Latch-up proof: fully isolated process is inherently

immune to any latch-up

• Input will withstand negative swing of up to 5V

• High capacitive load drive: 47,000pF

• Low delay time: 15ns (typ.)

• Logic high input for any voltage from 2.4V to VS

• Low equivalent input capacitance: 7pF (typ.)

MIC4421A/4422A drivers can replace three or more

discrete components, reducing PCB area requirements,

simplifying product design, and reducing assembly cost.

• Low supply current: 500µA (typ.)

• Output voltage swing to within 25mV of GND or VS

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.

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

___________________________________________________________________________________________________________

Typical Application

Load

Voltage

VS

+15V

1µF

0.1µF

0.1µF

On

Off

MIC4422A

1

7

VS OUT

8

6

VS OUT

IN

2

GND

4,5

Si9410DY*

N-Channel

MOSFET

* Siliconix 30m, 7A max.

† Load voltage limited by MOSFET drain-to-source rating

Low-Side Power Switch

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

June 2007

M9999-062707

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