LM334Z/NOPB

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℃ and is directly proportional to absolute temperature (°K). The simplest one external resistor connection, then, generates a current with +0.33%/℃ 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℃ and ±6℃ 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℃ to +125℃, the LM234 from -25℃ to +100℃ and the LM334 from 0℃ to +70℃. These devices are available in TO hermetic, TO - 92 and SOIC - 8 plastic packages.

Applications

• bias networks
• surge protection
• low power reference
• ramp generation
• LED driver
• temperature sensing
• remote sense applications

Key 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