LM18293 Four Channel Push-Pull Driver
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
(i e 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
Y
Y
Y
Y
Y
1A output current capability per channel
Pin for pin replacement for L293B
Special 16 pin power DIP package
36 volt operation
Internal thermal overload protection
Logical 鈥樷€?鈥欌€?input voltage up to 1 5 volts results in high
noise immunity
Typical Connection
TL H 8706 鈥?1
FIGURE 1 Application circuit showing bidirectional and on off control of a single DC motor
using two outputs and unidirectional on off 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
C
1995 National Semiconductor Corporation
TL H 8706
RRD-B30M115 Printed in U S A
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