TLH8706

March 1995

LM18293 Four Channel Push-Pull Driver

General Description

The LM18293 is designed to drive DC loads up to one amp

Typical applications include driving such inductive loads as

solenoids relays and stepper motors along with driving

switching power transistors and use as a buffer for low level

logic signals The four inputs accept standard TTL and DTL

levels for ease of interfacing Two enable pins are provided

that also accept the standard TTL and DTL levels Each

enable controls 2 channels and when an enable pin is dis-

abled (tied low) the corresponding outputs are forced to the

TRI-STATE condition If the enable pins are not connected

(ie floating) the circuit will function as if it has been en-

abled Separate pins are provided for the main power supply

(pin 8) and the logic supply (pin 16) This allows a lower

voltage to be used to bias up the logic resulting in reduced

power dissipation The chip is packaged in a specially de-

signed 16 pin power DIP The 4 center pins of this package

are tied together and form the die paddle inside the pack-

age This provides much better heat sinking capability than

most other DIP packages available The device is capable

of operating at voltages up to 36 volts

Features

Y

1A output current capability per channel

Y

Pin for pin replacement for L293B

Y

Special 16 pin power DIP package

Y

36 volt operation

Y

Internal thermal overload protection

Y

Logical ‘‘0’’ input voltage up to 15 volts results in high

noise immunity

Typical Connection

TLH8706 – 1

FIGURE 1 Application circuit showing bidirectional and onoff control of a single DC motor

using two outputs and unidirectional onoff function of two DC motors using a single output each

Order Number LM18293N

NS Package Number N16A

TRI-STATE

is a registered trademark of National Semiconductor Corp

C1995 National Semiconductor Corporation

RRD-B30M115Printed in U S A