April 2008

1

M9999-042108

MIC4426/4427/4428

Micrel, Inc.

MIC4426/4427/4428

Dual 1.5A-Peak Low-Side MOSFET Driver

General Description

The MIC4426/4427/4428 family are highly-reliable dual low-

sideMOSFETdriversfabricatedonaBiCMOS/DMOSprocess

for low power consumption and high efficiency. These drivers

translate TTL or CMOS input logic levels to output voltage

levels that swing within 25mV of the positive supply or ground.

Comparable bipolar devices are capable of swinging only

to within 1V of the supply. The MIC4426/7/8 is available in

three configurations: dual inverting, dual noninverting, and

one inverting plus one noninverting output.

The MIC4426/4427/4428 are pin-compatible replacements

for the MIC426/427/428 and MIC1426/1427/1428 with im-

proved electrical performance and rugged design (Refer to

the Device Replacement lists on the following page). They

can withstand up to 500mAof reverse current (either polarity)

without latching and up to 5V noise spikes (either polarity)

on ground pins.

Primarily intended for driving power MOSFETs, MIC4426/7/8

driversaresuitablefordrivingotherloads(capacitive,resistive,

orinductive)whichrequirelow-impedance,highpeakcurrent,

and fast switching time. Other applications include driving

heavily loaded clock lines, coaxial cables, or piezoelectric

transducers. The only load limitation is that total driver power

dissipation must not exceed the limits of the package.

Note See MIC4126/4127/4128 for high power and narrow

pulse applications.

Functional Diagram

INA

OUTA

INVERTING

NONINVERTING

0.1mA

0.6mA

2kΩ

INB

OUTB

INVERTING

NONINVERTING

0.1mA

0.6mA

2kΩ

GND

Features

• Bipolar/CMOS/DMOS construction

• Latch-up protection to >500mA reverse current

• 1.5A-peak output current

• 4.5V to 18V operating range

• Low quiescent supply current

4mA at logic 1 input

400µA at logic 0 input

• Switches 1000pF in 25ns

• Matched rise and rall times

• 7Ω output impedance

• <40ns typical delay

• Logic-input threshold independent of supply voltage

• Logic-input protection to –5V

• 6pF typical equivalent input capacitance

• 25mV max. output offset from supply or ground

• Replaces MIC426/427/428 and MIC1426/1427/1428

• Dual inverting, dual noninverting, and inverting/

noninverting configurations

• ESD protection

Applications

• MOSFET driver

• Clock line driver

• Coax cable driver

• Piezoelectic transducer driver

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