SNVS746E – MARCH 2000 – REVISED MAY 2013
LM134/LM234/LM334 3-Terminal Adjustable Current Sources
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FEATURES
Operates From 1V to 40V
0.02%/V Current Regulation
Programmable From 1μA to 10mA
True 2-Terminal Operation
Available as Fully Specified Temperature
Sensor
±3% Initial Accuracy
The sense voltage used to establish operating current
in the LM134 is 64mV at 25°C and is directly
proportional to absolute temperature (°K). The
simplest one external resistor connection, then,
generates a current with
≈+0.33%/°C
temperature
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, LED driver, and temperature
sensing. The LM234-3 and LM234-6 are specified as
true temperature sensors with ensured initial
accuracy of ±3°C and ±6°C, respectively. These
devices are ideal in remote sense applications
because series resistance in long wire runs does not
affect accuracy. In addition, only 2 wires are required.
The LM134 is specified 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 hermetic, TO-92 and SOIC-8
plastic packages.
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DESCRIPTION
The LM134/LM234/LM334 are 3-terminal adjustable
current sources featuring 10,000:1 range in operating
current, excellent 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 ±3%.
The LM134/LM234/LM334 are true floating current
sources with no separate power supply connections.
In addition, 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.
Connection Diagrams
Figure 1. SOIC-8 Surface Mount Package
(LM334M; LM334M/NOPB; LM334MX;
LM334MX/NOPB)
See Package Number D
Figure 2. SOIC-8 Alternative Pinout Surface Mount
Package
(LM334SM; LM334SM/NOPB; LM334SMX;
LM334SMX/NOPB)
See Package Number D
Figure 3. TO Metal Can Package (Bottom View)
See Package Number NDV
Figure 4. TO-92 Plastic Package (Bottom View)
See Package Number LP
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Copyright © 2000–2013, Texas Instruments Incorporated
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
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