LM334SMX National Semiconductor, LM334SMX Datasheet

LM334SMX

Manufacturer Part Number

LM334SMX

Description

3-Terminal Adjustable Current Sources

Manufacturer

National Semiconductor

Datasheet

1.LM334SMX.pdf (14 pages)

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LM134/LM234/LM334

3-Terminal Adjustable Current Sources

General Description

The LM134/LM234/LM334 are 3-terminal adjustable current

sources featuring 10,000:1 range in operating current, excel-

lent current regulation and a wide dynamic voltage range of

1V to 40V. Current is established with one external resistor

and no other parts are required. Initial current accuracy is

sources with no separate power supply connections. In addi-

tion, reverse applied voltages of up to 20V will draw only a

few dozen microamperes of current, allowing the devices to

act as both a rectifier and current source in AC applications.

The sense voltage used to establish operating current in the

LM134 is 64mV at 25˚C and is directly proportional to abso-

lute temperature (˚K). The simplest one external resistor

connection, then, generates a current with +0.33%/˚C tem-

perature dependence. Zero drift operation can be obtained

by adding one extra resistor and a diode.

Applications for the current sources include bias networks,

surge protection, low power reference, ramp generation,

Connection Diagrams

3%. The LM134/LM234/LM334 are true floating current

See NS Package Number M08A

Order Number LM334M or

Surface Mount Package

LM334MX

SO-8

DS005697-24

Order Number LM334Z, LM234Z-3 or LM234Z-6

DS005697

See NS Package Number M08A

See NS Package Number Z03A

Order Number LM334SM or

TO-92 Plastic Package

Surface Mount Package

SO-8 Alternative Pinout

Bottom View

LM334SMX

DS005697-10

LED driver, and temperature sensing. The LM234-3 and

LM234-6 are specified as true temperature sensors with

guaranteed initial accuracy of

These devices are ideal in remote sense applications be-

cause series resistance in long wire runs does not affect ac-

curacy. In addition, only 2 wires are required.

The LM134 is guaranteed over a temperature range of

−55˚C to +125˚C, the LM234 from −25˚C to +100˚C and the

LM334 from 0˚C to +70˚C. These devices are available in

TO-46 hermetic, TO-92 and SO-8 plastic packages.

Features

n Operates from 1V to 40V

n 0.02%/V current regulation

n Programmable from 1µA to 10mA

n True 2-terminal operation

n Available as fully specified temperature sensor

3% initial accuracy

DS005697-25

−

Pin is electrically connected to case.

Order Number LM134H,

3˚C and

LM234H or LM334H

Metal Can Package

See NS Package

Number H03H

Bottom View

TO-46

6˚C, respectively.

DS005697-12

www.national.com

March 2000

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