LM134, LM234, LM334
SNVS746E – MARCH 2000 – REVISED MAY 2013
LM134/LM234/LM334 3-Terminal Adjustable Current Sources
Check for Samples: LM134, LM234, LM334
•2 Operates From 1V to 40V
• 0.02%/V Current Regulation
• Programmable From 1μA to 10mA
• True 2-Terminal Operation
• Available as Fully Specified Temperature
• ±3% Initial Accuracy
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.
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
Figure 1. SOIC-8 Surface Mount Package
(LM334M; LM334M/NOPB; LM334MX;
See Package Number D
Figure 2. SOIC-8 Alternative Pinout Surface Mount
(LM334SM; LM334SM/NOPB; LM334SMX;
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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