LMD18400 Datasheet, PDF (1/26 Pages) National Semiconductor (TI) – Quad High Side Driver

LMD18400
www.ti.com
SNVS094C – JUNE 1996 – REVISED APRIL 2013
LMD18400 Quad High Side Driver
Check for Samples: LMD18400
FEATURES
1
•2 Four Independent Outputs with >3A Peak, 1A
Continuous Current Capability
• 1.3Ω Maximum ON Resistance Over
Temperature
• True Instantaneous Power Limit for Each
Switch
• High Survival Voltage (60 V_DC, 80V Transient)
• Shorted Load (to Ground and Supply)
Protection
• Overvoltage Shutdown at V_CC > 35V
• LS TTL/CMOS Compatible Logic Inputs and
Outputs
• <10 µA Supply Current in “Sleep” Mode
• −5V Output Clamp for Discharging Inductive
Loads
• Serial Data Interface for 11 Diagnostic Checks:
– Switch ON/OFF Status
– Open or 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
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 (>3 Amps transient) to a
common positive power supply. 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 µA. Separate ON/OFF control
of each switch is provided through standard
LSTLL/CMOS logic compatible inputs.
A MICROWIRE 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 excessive operating temperature.
The LMD18400 is packaged in a special power
dissipating leadframe that reduces the junction to
case thermal resistance to approximately 20°C/W.
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
All trademarks are the property of their respective owners.
2
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 1996–2013, Texas Instruments Incorporated