MIC4421 Micrel Semiconductor, MIC4421 Datasheet

MIC4421

Manufacturer Part Number

MIC4421

Description

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

Manufacturer

Micrel Semiconductor

Datasheet

1.MIC4421.pdf (10 pages)

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General Description

MIC4421 and MIC4422 MOSFET drivers are rugged, effi-

cient, and easy to use. The MIC4421 is an inverting driver,

while the MIC4422 is a non-inverting driver.

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

the largest MOSFETs with an improved safe operating mar-

gin. The MIC4421/4422 accepts any logic input from 2.4V to

works. 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.

MIC4421/4422 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 free-

dom from latch-up. The rail-to-rail swing capability of CMOS/

DMOS insures adequate gate voltage to the MOSFET dur-

ing 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.

Functional Diagram

MIC4421/4422

without external speed-up capacitors or resistor net-

0.1mA

0.3mA

NON-INVERTING

5-42

INVERTING

MIC4421

MIC4422

Features

• BiCMOS/DMOS Construction

• Latch-Up Proof: Fully Isolated Process is Inherently

• Input Will Withstand Negative Swing of Up to 5V

• Matched Rise and Fall Times ............................... 25ns

• High Peak Output Current .............................. 9A Peak

• Wide Operating Range .............................. 4.5V to 18V

• High Capacitive Load Drive ........................... 47,000pF

• Low Delay Time ........................................... 30ns Typ.

• Logic High Input for Any Voltage from 2.4V to V

• Low Equivalent Input Capacitance (typ) ................. 7pF

• Low Supply Current .............. 450 A With Logic 1 Input

• Low Output Impedance ........................................ 1.5

• Output Voltage Swing to Within 25mV of GND or V

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

Immune to Any Latch-up.

9A-Peak Low-Side MOSFET Driver

Bipolar/CMOS/DMOS

MIC4421/4422

GND

OUT

Process

April 1998

Micrel

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