LM134 - 3-Terminal Adjustable Current Source

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 plastic packages.

Products containing the "LM134" keyword are: LM134 , LM134 MDC , LM134AH , LM134DT , LM134DZ , LM134H , LM134H , LM134H-3 , LM134H-3/883 , LM134H-6 , LM134H-6/883 , LM134H-MIL , LM134H/883 , LM134H/883B , LM134H/883C , LM134H/883Q , LM134H/N0PB , LM134H/NOPB , LM134H/NOPB , LM134H3

• 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

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