July 2005

1

M9999-072205

MIC4420/4429

Micrel, Inc.

MIC4420/4429

6A-Peak Low-Side MOSFET Driver

Bipolar/CMOS/DMOS Process

General Description

MIC4420, MIC4429 and MIC429 MOSFET drivers are

tough, efficient, and easy to use. The MIC4429 and MIC429

are inverting drivers, while the MIC4420 is a non-inverting

driver.

They are capable of 6A (peak) output and can drive the larg-

est MOSFETs with an improved safe operating margin. The

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.

MIC4420/4429/429 drivers can replace three or more

discrete components, reducing PCB area requirements,

simplifying product design, and reducing assembly cost.

Modern BiCMOS/DMOS construction guarantees freedom

from latch-up. The rail-to-rail swing capability insures ad-

equate gate voltage to the MOSFET during power up/down

sequencing.

Note: See MIC4120/4129 for high power and narrow

pulse applications.

Features

• CMOS Construction

• Latch-Up Protected: Will Withstand >500mA

Reverse Output Current

• Logic Input Withstands Negative Swing of Up to 5V

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

• High Peak Output Current ............................... 6A Peak

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

• High Capacitive Load Drive ............................10,000pF

• Low Delay Time .............................................. 55ns Typ

• Low Equivalent Input Capacitance (typ) ..................6pF

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

• Low Output Impedance ......................................... 2.5Ω

Applications

• Switch Mode Power Supplies

• Motor Controls

• Pulse Transformer Driver

• Class-D Switching Amplifiers

Functional Diagram

IN

OUT

MIC4429

INVERTING

MIC4420

NONINVERTING

0.1mA

0.4mA

2kΩ

GND

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