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LMD18400NNSCN/a50avaiQuad High Side Driver


LMD18400N ,Quad High Side DriverLMD18400 Quad High Side DriverJune 1996LMD18400Quad High Side Driver
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LMD18400N
Quad High Side Driver
LMD18400
Quad High Side Driver
General Description

The LMD18400isa fully protected quad high side driver.It
contains four common-drain DMOS N-channel power
switches, each capableof switchinga continuous1 Amp
load (>3 Amps transient)toa common positive power sup-
ply. The switches are fully protected from excessive voltage,
current and temperature.An instantaneous power sensing
circuit calculates the productof the voltage across and the
current through each DMOS switch and limitsthe powertoa
safe level. The device canbe disabledto producea “sleep”
condition reducing the supply currentto less than10 µA.
Separate ON/OFF controlof each switchis provided through
standard LSTLL/CMOS logic compatible inputs. MICROWIRE™ compatible serial data interfaceis builtin 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 flagsto providean immediate
indicationofa general system fault andan indicationof
excessive operating temperature.
The LMD18400is packagedina special power dissipating
leadframe that reduces the junctionto case thermal resis-
tanceto approximately 20˚C/W.
Features
Four independent outputs with >3A peak,1A continuous
current capability 1.3Ω maximum ON resistance over temperature True instantaneous power limitfor each switch High survival voltage (60 VDC, 80V transient) Shorted load(to ground and supply) protection Overvoltage shutdownat VCC> 35VLS TTL/CMOS compatible logic inputs and outputs <10µA supply currentin “sleep” mode −5V output clampfor discharging inductive loads Serial data interfacefor11 diagnostic checks: Switch ON/OFF status Openor shorted load Operating temperature Excessive supply voltage Two direct-output error flags
Applications
Relay and solenoid drivers High impedance automotive fuel injector drivers Lamp drivers Power supply switching Motor drivers
Typical Application

June 1996
LMD18400
Quad
High
Side
Driver
ic,good price


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