LM334

LM134-LM234 LM334 THREE TERMINAL ADJUSTABLE CURRENT SOURCES . . . . OPERATES from 1V to 40V 0.02% V CURRENT REGULATION PROGRAMMABLE from 1µA to 10mA ±3% INITIAL ACCURACY Z TO92 (Plastic Package) DESCRIPTION The LM134/LM234/LM334 are 3-terminal adjustable current sources characterized by : - an operating current range of 10000 : 1 - an excellent current regulation - a wide dynamic voltage range of 1V to 40V The current is determined by an external resistor without requiring other external components. Reverse voltages of up to 20V will only draw a current of several microamperes. This enables the circuit to operate as a rectifier and as a source of current in a.c. applications. For the LM134/LM234/LM334, the voltage on the control pin is 64mV at +25oC and is directly proportionalto the absolute temperature (oK). The simplest external resistor connection generates a current with ≈ 0.33%/oC temperature dependence. Zero drift can be obtainedby adding an additionalresistor and a diode to the external circuit. PIN CONNECTIONS TO92 (Bottom view) NC D SO8 (Plastic Micropackage) ORDER CODES Part Number LM134 LM234 LM334 Example : LM134Z Temperature Range –55oC, +125oC –25 C, +100 C 0 C, +70 C o o o o Package Z D SO8 (Top view) NC 8 V+ 2 7 V6 NC 5 AD J 1 V - 3 1 ADJ 2 NC 3 NC 4 V+ October 1997 1/10 LM134-LM234-LM334 SCHEMATIC DIAGRAM V Q4 Q5 Q6 Q3 C1 50pF Q2 Q1 ADJ V ABSOLUTE MAXIMUM RATING Symbol Voltage V to V Forward Reverse VADJISET Ptot Tst...