參數(shù)資料
型號： LMD18400
廠商： National Semiconductor Corporation
英文描述： Quad High Side Driver
中文描述： 四高邊驅(qū)動器
文件頁數(shù)： 1/18頁
文件大小： 329K
代理商： LMD18400
TL/H/11026
L
June 1996
LMD18400
Quad High Side Driver
General Description
The LMD18400 is a fully protected quad high side driver. It
contains four common-drain DMOS N-channel power
switches, each capable of switching a continuous 1 Amp
load (
l
3 Amps transient) to a common positive power sup-
ply. The switches are fully protected from excessive voltage,
current and temperature. An instantaneous power sensing
circuit calculates the product of the voltage across and the
current through each DMOS switch and limits the power to a
safe level. The device can be disabled to produce a ‘‘sleep’’
condition reducing the supply current to less than 10
m
A.
Separate ON/OFF control of each switch is provided
through standard LSTLL/CMOS logic compatible inputs.
A MICROWIRE
TM
compatible serial data interface is built in
to provide extensive diagnostic information. This information
includes switch status readback, output load fault conditions
and thermal and overvoltage shutdown status. There are
also two direct-output error flags to provide an immediate
indication of a general system fault and an indication of ex-
cessive operating temperature.
The LMD18400 is packaged in a special power dissipating
leadframe that reduces the junction to case thermal resist-
ance to approximately 20
§
C/W.
Features
Y
Four independent outputs with
l
3A peak, 1A continu-
ous current capability
Y
1.3
X
maximum ON resistance over temperature
Y
True instantaneous power limit for each switch
Y
High survival voltage (60 V
DC
, 80V transient)
Y
Shorted load (to ground and supply) protection
Y
Overvoltage shutdown at V
CC
l
35V
Y
LS TTL/CMOS compatible logic inputs and outputs
Y
k
10
m
A supply current in ‘‘sleep’’ mode
Y
b
5V output clamp for discharging inductive loads
Y
Serial data interface for 11 diagnostic checks:
D Switch ON/OFF status
D Open or shorted load
D Operating temperature
D Excessive supply voltage
Y
Two direct-output error flags
Applications
Y
Relay and solenoid drivers
Y
High impedance automotive fuel injector drivers
Y
Lamp drivers
Y
Power supply switching
Y
Motor drivers
Typical Application
TL/H/11026–1
Connection Diagram
TL/H/11026–2
Order Number LMD18400N
See NS Package Number N20A
TRI-STATE
é
is a registered trademark of National Semiconductor Corporation.
MICROWIRE
TM
is a trademark of National Semiconductor Corporation.
C
1996 National Semiconductor Corporation
RRD-B30M76/Printed in U. S. A.
http://www.national.com
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