National Semiconductor LMD18400 Technical data

LMD18400 Quad High Side Driver

June 1996

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

3 Amps transient) to a common positive power sup-

load ( 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 µA. Separate ON/OFF control of each switch is provided through standard LSTLL/CMOS logic compatible inputs.

™

A MICROWIRE 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.

compatible serial data interface is built in

Features

n Four independent outputs with>3A peak, 1A continuous

current capability

n 1.3Ω maximum ON resistance over temperature n True instantaneous power limit for each switch n High survival voltage (60 V n Shorted load (to ground and supply) protection n Overvoltage shutdown at V n LS TTL/CMOS compatible logic inputs and outputs

10 µA supply current in “sleep” mode

n −5V output clamp for discharging inductive loads n Serial data interface for 11 diagnostic checks:

— Switch ON/OFF status — Open or shorted load — Operating temperature — Excessive supply voltage

n Two direct-output error flags

, 80V transient)

35V

Applications

n Relay and solenoid drivers n High impedance automotive fuel injector drivers n Lamp drivers n Power supply switching n Motor drivers

Typical Application

01102601

Connection Diagram

LMD18400

Order Number LMD18400N

See NS Package Number N20A

01102602

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LMD18400

Absolute Maximum Ratings (Note 1)

If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications.

Supply Survival Voltage (Pin 20)

Transient (t = 10 ms) 80V

Continuous −0.5V to +60V

Output Transient Current (Each Switch) 3.75A

Logic Input Voltage (Pins 4, 7) −0.3V to +6V

Error Flag Voltage 16V

ESD Susceptibility (Note 2) 2000V

Power Dissipation (Note 3) 5W

Internally Limited

Junction Temperature (T

150˚C) 150˚C

MAX

Storage Temperature Range −65˚C to +150˚C

Lead Temperature (Soldering, 10 sec.) +260˚C

Output Transient Current

(Total, All Switches) 6A

Operating Ratings (Note 1)

Output Steady State Current

(Each Switch) 1A

Logic Input Voltage

Ambient Temperature Range (T

Supply Voltage Range 7V to 28V

) −25˚C to +85˚C

(Pins 3, 9, 10, 11, 12) −0.3V to +16V

Electrical Characteristics V

over the entire operating temperature range, −25˚C ≤ T

Parameter Conditions

= 12V, CCP= 0.01 µFd, unless otherwise indicated. Boldface limits apply

≤ +85˚C, all other limits are for TA=TJ= +25˚C.

Typical

(Note 4)

Limit

(Note 5)

Units

(Limit)

DC CHARACTERISTICS

Supply Current Enable Input = 0V 0.04 10 µA (Max)

Enable Input = 5V, Inputs = 0V 7.5 15 mA (Max)

Enable Input = 5V, Inputs = 5V

Open Loads 7.5 15 mA (Max)

Output Leakage Enable Input = 0V, Inputs = 0V

(Pins 1, 2, 18, 19)

Rds ON I

Short Circuit Current V

Maximum Output Current V

= 1A, (Note 6) 0.8 1.3 Ω (Max)

OUT

= 12V, (Note 6) 1.2 0.6 A (Min)

= 7V, (Note 6) 2.4 A

= 28V, (Note 6) 0.6 A

CC−VO

= 4V, (Note 6) 3.75 A

0.01 300 µA (Max)

Lead Error Threshold Voltage Pins 1, 2, 18, 19 4.1 V

Open Load Detection Current Pins 1, 2, 18, 19 150 µA

Negative Clamp Output Voltage I

= 1A, (Note 6) −5 V

Overvoltage Shutdown Threshold 31 40 V (Max)

Overvoltage Shutdown Hysteresis 0.75 V

Error Output Leakage Current V

Thermal Warning Temperature V

Thermal Shutdown Temperature V

Thermal Warning Temperature V

= 12V 0.001 10 µA (Max)

PIN 13

PIN 17

PIN 13

0.8V 145 ˚C

0.8V 170 ˚C

0.8V 145 ˚C

AC CHARACTERISTICS

Switch Turn-On Delay (t

Switch Turn-On Rise Time (t

Switch Turn-Off Delay (t

Switch Turn-Off Fall Time (t

Enable Time (t

) Measured with Switch 1, Pin9=5V 30 50 µs(Max)

Error Reporting Delay (t

Data Setup Time (t

TRI-STATE

Control (t1H,tOH) Pin 8, Hi-Z Enable Time 2 µs

) Enable (Pin 3) = 5V, I

d(ON)

) Enable (Pin 3) = 5V, I

d(OFF)

OFF

) Enable (Pin 3) = 5V, Switch 1 Load

Error

= 1A 7 15 µs (Max)

OUT

= 1A 0.15 1 µs (Max)

OUT

Opened

= 30 pF 200 500 ns (Min)

= 1A 5 10 µs (Max)

OUT

= 1A 0.5 2 µs (Max)

OUT

75 150 µs (Max)

Data Clock Frequency 3 1 MHz (Max)

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Electrical Characteristics V

= 12V, CCP= 0.01 µFd, unless otherwise indicated. Boldface limits apply over

the entire operating temperature range, −25˚C ≤ T

≤ +85˚C, all other limits are for TA=TJ= +25˚C. (Continued)

LMD18400

Parameter Conditions

Typical

(Note 4)

Limit

(Note 5)

DIGITAL CHARACTERISTICS

Logic “1” Input Voltage Pins 3, 4, 7, 9, 10, 11, 12 2.0 V (Min)

Logic “0” Input Voltage Pins 3, 4, 7, 9, 10, 11, 12 0.8 V (Max)

Logic “1” Input Current Pins 4, 7 0.001 1 µA (Max)

Logic “0” Input Current Pins 4, 7 −0.001 −1 µA (Max)

TRI-STATE Output Current Pin 8, Pin4=5V 0.05 10 µA (Max)

Pin8=0V −0.05 −10 µA (Max)

Enable Input Current Pin 3 = 2.4V 12 25 µA (Max)

Channel Input Resistance Pins 9, 10, 11, 12 75 15 kΩ (Min)

Error Output Sink Current Pin 13 = 0.8V 4 1.6 mA (Min)

Logic “1” Output Voltage Pin 8

= −360 µA 4.4 2.4 V (Min)

OUT

= −10 µA 5.1 4.5 V (Min)

OUT

= −10 µA 5.5 V (Min)

OUT

Logic “0” Output Voltage Pin 8

OUT

Thermal Shutdown Output Source

Pin 17 = 2.4V

Current

= 100 µA

5 3 µA (Min)

0.4 V (Max)

Thermal Shutdown Output Sink Current Pin 17 = 0.8V 360 250 µA (Min)

Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is intended to be functional, but do not guarantee specific performance limits. For guaranteed specifications and test conditions, see the Electrical Characteristics.

Note 2: Human body model; 100 pF discharge through a 1.5 kΩ resistor. All pins except pins 8 and 13 which are protected to 1000V and pins 1, 2, 18 and 19 which are protected to 500V.

Note 3: The maximum power dissipation is a function of T ambient temperature is P shutdown. For the LMD18400 the junction-to-ambient thermal resistance, θ the package will be, I

Note 4: Typical values are at T

Note 5: All limits are 100% production tested at +25˚C. Limits at temperature extremes are guaranteed through correlation and accepted Statistical Quality Control

(SQC) methods.

Note 6: Pulse Testing techniques used. Pulse width is

=(T

MAX

–TA)/θJA. If this dissipation is exceeded, the die temperature will rise above 150˚C and the device will eventually go into thermal

MAX

x 4 switches 1A2x 1.3Ω x 4 = 5.2W).

(MAX)

= +25˚C and represent the most likely parametric norm.

, θJA, and TAand is limited by thermal shutdown. The maximum allowable power dissipation at any

MAX

, is 60˚C/W. With sufficient heatsinking the maximum continuous power dissipation for

5 ms with a duty cycle<1%.

Units

(Limit)

Timing Specification Definitions

Switching Turn ON/OFF Enable Turn-On

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01102604

Timing Specification Definitions (Continued)

Error Reporting Delay Data Setup Time

LMD18400

01102605

Typical Performance Characteristics For all curves, V

perature unless otherwise noted.

Switch ON Resistance

vs Temperature

01102631

Maximum Power Dissipation

vs Ambient Temperature

= 12V, Temperature is the junction tem-

“Sleep Mode” Supply Current

vs Temperature

01102632

Short Circuit Current

vs Temperature

01102606

01102633

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Typical Performance Characteristics For all curves, V

temperature unless otherwise noted. (Continued)

= 12V, Temperature is the junction

LMD18400

Clamp Characteristics

vs Temperature

Turn ON Rise Time

vs Temperature

01102635

Error Sense Threshold

Voltage vs Temperature

01102636

Turn ON Delay Time

vs Temperature

Turn OFF Time

vs Temperature

01102637 01102638

Switch Select Logic Input

Resistance vs Temperature

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