Maker : National Semiconductor
Part No. : LM334M

  Datasheet PDF : LM334M.pdf
  Cross Reference : LM334M Cross Reference
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Shortcut : LM334  LM334  LM334  LM334D  LM334H  LM334M  LM334MX  LM334S8  LM334SM  LM334SMX  LM334Z  LM334Z 

Product Information

LM134/LM234/LM334 3-Terminal Adjustable Current Sources March 2000 LM134/LM234/LM334 3-Terminal Adjustable Current Sources General 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. 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 guaranteed 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 guaranteed 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-46 hermetic, TO-92 and SO-8 plastic packages. Features n n n n n n 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 Connection Diagrams SO-8 Surface Mount Package SO-8 Alternative Pinout Surface Mount Package TO-46 Metal Can Package DS005697-24 DS005697-12 DS005697-25 Order Number LM334M or LM334MX See NS Package Number M08A Order Number LM334SM or LM334SMX See NS Package Number M08A V− Pin is electrically connected to case. Bottom View Order Number LM134H, LM234H or LM334H See NS Package Number H03H TO-92 Plastic Package DS005697-10 Bottom View Order Number LM334Z, LM234Z-3 or LM234Z-6 See NS Package Number Z03A © 2000 National Semiconductor Corporation DS005697 www.national.com LM134/LM234/LM334 Absolute Maximum Ratings (Note 1) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. V+ to V− Forward Voltage LM134/LM234/LM334 LM234-3/LM234-6 V+ to V− Reverse Voltage R Pin to V− Voltage Set Current Power Dissipation ESD Susceptibility (Note 6) Operating Temperature Range (Note 5) LM134 40V 30V 20V 5V 10 mA 400 mW 2000V −55˚C to +125˚C LM234/LM234-3/LM234-6 −25˚C to +100˚C LM334 0˚C to +70˚C Soldering Information TO-92 Package (10 sec.) 260˚C TO-46 Package (10 sec.) 300˚C SO Package Vapor Phase (60 sec.) 215˚C Infrared (15 sec.) 220˚C See AN-450 “Surface Mounting Methods and Their Effect on Product Reliability” (Appendix D) for other methods of soldering surface mount devices. Electrical Characteristics (Note 2) Parameter Set Current Error, V+ =2.5V, (Note 3) Ratio of Set Current to Bias Current Minimum Operating Voltage Conditions Min 10µA ≤ ISET ≤ 1mA 1mA < ISET ≤ 5mA 2µA ≤ ISET < 10µA 100µA ≤ ISET ≤ 1mA 1mA ≤ ISET ≤ 5mA 2 µA≤ISET≤100 µA 2µA ≤ ISET ≤ 100µA 100µA < ISET ≤ 1mA 1mA < ISET ≤ 5mA Average Change in Set Current with Input Voltage 2µA ≤ ISET ≤ 1mA 1.5 ≤ V+ ≤ 5V 5V ≤ V+ ≤ 40V 1mA < ISET ≤ 5mA 1.5V ≤ V ≤ 5V 5V ≤ V ≤ 40V Temperature Dependence of Set Current (Note 4) Effective Shunt Capacitance 15 15 pF Note 1...

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