Features Four independent outputs with >3A peak, 1A continuous current capability 1.3 maximum ON resistance over temperature True instantaneous power limit for each switch High survival voltage (60 VDC, 80V transient) Shorted load (to ground and supply) protection Overvoltage shutdown at VCC > 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 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. Applications Relay and solenoid drivers High impedance automotive fuel injector drivers Lamp drivers Power supply switching Motor drivers

Typical Application click for larger image	Block Diagram click for larger image
Typical Performance click for larger image

Datasheets

Title		Size	Date	Other Language
	LMD18400 Quad High Side Driver	623 Kbytes	3-Aug-04

Part Number(s) (NSID)	Top View	Availability	Current Reported Stock	Budgetary Pricing	Pack Size
LMD18400N/NOPB LMD18400N RoHS Status	MDIP	Full production Lead Time: 6 weeks	Distributor Region Qty ARROW Worldwide 11 DIGI-KEY Worldwide 82 FARNELL Europe and Asia 175 MOUSER Worldwide 45 NEWARK Americas 108 TAYLOR Americas 11	$6.55 each at 1K+ pcs	rail of 18

All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/en/packaging/leadfree.html.

Moisture Sensitivity Level Data for LMD18400.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

National's certificate of product compliance for LMD18400 is located at RoHS Status.

Part Number(s) (NSID)	Weight (milligrams)	Type	Pins	MSL Rating	Peak Reflow	RoHS Status	CAD Symbols	Models	Package Marking Format
LMD18400N/NOPB LMD18400N	1424.649 1429.999	MDIP	20	1 1	NA NA	Detail	N/A	N/A	NSUZXYYTTE# LMD18400N

All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/en/packaging/leadfree.html.

Moisture Sensitivity Level Data for LMD18400.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

National's certificate of product compliance for LMD18400 is located at RoHS Status.

CAD Symbols and Models N/A

Models N/A