January 1999

1

MIC4423/4424/4425

MIC4423/4424/4425

Micrel

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

350

µA with logic-0 input

•

Low 3.5

Ω typical output impedance

•

•

‘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 output

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

capable 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.

The MIC4423/4424/4425 series drivers are easier to use,

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/

4424/4425 drivers are suitable for driving other loads

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

impedance, high peak currents, and fast switching times.

Heavily loaded clock lines, coaxial cables, or piezoelectric

transducers 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.

Functional Diagram

Integrated Component Count:

4 Resistors

4 Capacitors

52 Transistors

Ground Unused Inputs

INA

OUTA

INVERTING

NONINVERTING

0.1mA

0.6mA

2k

Ω

INB

OUTB

INVERTING

NONINVERTING

0.1mA

0.6mA

2k

Ω

GND

Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 944-0970 • http://www.micrel.com