LM134-3 Linear Technology Corporation, LM134-3 Datasheet

LM134-3

Manufacturer Part Number

LM134-3

Description

Constant Current Source And Temperature Sensor

Manufacturer

Linear Technology Corporation

Datasheet

1.LM134-3.pdf (12 pages)

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Download datasheet (156Kb)

FEATURES

TYPICAL APPLICATIO

APPLICATIO S

, LTC and LT are registered trademarks of Linear Technology Corporation.

1 A to 10mA Operation

0.02%/V Regulation

0.8V to 40V Operating Voltage

Can be Used as Linear Temperature Sensor

Draws No Reverse Current

Supplied in Standard Transistor Packages

Current Mode Temperature Sensing

Constant Current Source for Shunt References

Cold Junction Compensation

Constant-Gain Bias for Bipolar Differential Stage

Micropower Bias Networks

Buffer for Photoconductive Cell

Current Limiter

Remote Temperature Sensor with Voltage Output

226

SET

LM234-3

–

10k

10mV/ K

TA01a

DESCRIPTIO

The LM134 is a three-terminal current source designed to

operate at current levels from 1 A to 10mA, as set by an

external resistor. The device operates as a true two-

terminal current source, requiring no extra power connec-

tions or input signals. Regulation is typically 0.02%/V and

terminal-to-terminal voltage can range from 800mV to

40V.

Because the operating current is directly proportional to

absolute temperature in degrees Kelvin, the device will

also find wide applications as a temperature sensor. The

temperature dependence of the operating current is

0.336%/ C at room temperature. For example, a device

operating at 298 A will have a temperature coefficient of

1 A/ C. The temperature dependence is extremely accu-

rate and repeatable. Devices specified as temperature

sensors in the 100 A to 1mA range are the LM134-3,

LM234-3 and the LM134-6, LM234-6, with the dash

numbers indicating 3 C and 6 C accuracies, respec-

tively.

If a zero temperature coefficient current source is re-

quired, this is easily achieved by adding a diode and a

resistor.

Constant Current Source

and Temperature Sensor

500

400

300

200

100

Operating Current vs Temperature

100

OPERATING CURRENT ( A)

SET

200

= 226

LM134 Series

300

400

TA01b

500

225

125

–75

–175

–275

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