July 2005

1

MIC4423/4424/4425

MIC4423/4424/4425

Micrel, Inc.

INA

OUTA

INVERTING

NONINVERTING

0.1mA

0.6mA

2kΩ

INB

OUTB

INVERTING

NONINVERTING

0.1mA

0.6mA

2kΩ

GND

MIC4423/4424/4425

Dual 3A-Peak Low-Side MOSFET Driver

Bipolar/CMOS/DMOS Process

Features

•

Reliable, low-power bipolar/CMOS/DMOS construction

•

Latch-up protected to >500mA reverse current

•

Logic input withstands swing to –5V

•

High 3A-peak output current

•

Wide 4.5V to 18V operating range

•

Drives 1800pF capacitance in 25ns

•

Short <40ns typical delay time

•

Delay times consistent with in supply voltage change

•

Matched rise and fall times

•

TTL logic input independent of supply voltage

•

Low equivalent 6pF input capacitance

•

Low supply current

3.5mA with logic-1 input

350µA with logic-0 input

•

Low 3.5Ω typical output impedance

•

Output voltage swings within 25mV of ground or V

•

‘426/7/8-, ‘1426/7/8-, ‘4426/7/8-compatible pinout

•

Inverting, noninverting, and differential configurations

General Description

The MIC4423/4424/4425 family are highly reliable BiCMOS/

DMOS buffer/driver/MOSFET drivers. They are higher out-

put current versions of the MIC4426/4427/4428, which are

improved versions of the MIC426/427/428. All three families

are pin-compatible. The MIC4423/4424/4425 drivers are ca-

pable of giving reliable service in more demanding electrical

environments than their predecessors. They will not latch

under any conditions within their power and voltage ratings.

They can survive up to 5V of noise spiking, of either polarity,

on the ground pin. They can accept, without either damage

or logic upset, up to half an amp of reverse current (either

polarity) forced back into their outputs.

TheMIC4423/4424/4425seriesdriversareeasiertouse,more

flexible in operation, and more forgiving than other CMOS

or bipolar drivers currently available. Their BiCMOS/DMOS

construction dissipates minimum power and provides rail-to-

rail voltage swings.

Primarily intended for driving power MOSFETs, the

MIC4423/4424/4425driversaresuitablefordrivingotherloads

(capacitive, resistive, or inductive) which require low-imped-

ance, high peak currents, and fast switching times. Heavily

loadedclocklines,coaxialcables,orpiezoelectrictransducers

are some examples. The only known limitation on loading is

that total power dissipated in the driver must be kept within

the maximum power dissipation limits of the package.

Note: See MIC4123/4124/4125 for high power and narrow

pulse applications.

Functional Diagram

Integrated Component Count:

4 Resistors

4 Capacitors

52 Transistors

Ground Unused Inputs

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