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DESCRIPTION

The LM134/LM234/LM334 are 3-terminal adjust-

able current sources characterized by:

The current is determined by an external resistor

without requiring other external components.

Reverse voltages of up to 20V will only draw a cur-

rent of several microamperes. This enables the

circuit to operate as a rectifier and as a source of

current in a.c. applications.

For the LM134/LM234/LM334, the voltage on the

control pin is 64mV at +25°C and is directly pro-

portional to the absolute temperature (°K). The

simplest external resistor connection generates a

current with

≈ 0.33%/°C temperature dependence.

Zero drift can be obtained by adding an additional

resistor and a diode to the external circuit.

ORDER CODE

Z = TO92 Plastic package - also available in Bulk (Z), Tape & Reel (ZT)

and Ammo Pack (AP)

D = Small Outline Package (SO) - also available in Tape & Reel (DT)

PIN CONNECTIONS (top view)

Part Number

Temperature

Range

Package

ZD

LM134

-55°C, +125°C

••

LM234

-25°C, +100°C

••

LM334

0°C, +70°C

••

Z

TO92

(Plastic Package)

D

SO8

(Plastic Micropackage)

ADJ

v+

v-

21

3

8765

1234

NC

NC

V-

NC

ADJ

NC

NC

V+

TO92

(Top view)

SO8

(Top view)

LM134

LM234 - LM334

THREE TERMINAL ADJUSTABLE CURRENT SOURCES

May 2003