TEMPERATURE (C) LM134 Series Constant Current Source and Temperature Sensor FEATURES DESCRIPTIO n 1m A to 10mA Operation The LM134 is a three-terminal current source designed to n 0.02%/V Regulation operate at current levels from 1m A to 10mA, as set by an n 0.8V to 40V Operating Voltage external resistor. The device operates as a true two- n Can be Used as Linear Temperature Sensor terminal current source, requiring no extra power connec- n Draws No Reverse Current tions or input signals. Regulation is typically 0.02%/V and n Supplied in Standard Transistor Packages terminal-to-terminal voltage can range from 800mV to 40V. U Because the operating current is directly proportional to APPLICATIO S absolute temperature in degrees Kelvin, the device will n Current Mode Temperature Sensing also find wide applications as a temperature sensor. The n Constant Current Source for Shunt References temperature dependence of the operating current is n Cold Junction Compensation 0.336%/ C at room temperature. For example, a device n Constant-Gain Bias for Bipolar Differential Stage operating at 298m A will have a temperature coefficient of n Micropower Bias Networks 1m A/ C. The temperature dependence is extremely accu- n Buffer for Photoconductive Cell rate and repeatable. Devices specified as temperature n Current Limiter sensors in the 100m A to 1mA range are the LM134-3, LM234-3 and the LM134-6, LM234-6, with the dash numbers indicating 3 C and 6 C accuracies, respec- tively. If a zero temperature coefficient current source is re- quired, this is easily achieved by adding a diode and a , LTC and LT are registered trademarks of Linear Technology Corporation. resistor. TYPICAL APPLICATIO Remote Temperature Sensor with Voltage Output Operating Current vs Temperature 225 500 V 5V IN 400 125 + V R = 226 SET 300 25 R R SET 10mV/K 200 75 226 LM234-3 V R1 10k 175 100 TA01a 0 275 0 100 200 300 400 500 OPERATING CURRENT (A) TA01b 1 TEMPERATURE (K) U ULM134 Series ABSOLUTE AXI U RATI GS (Note 1) + V to V Forward Voltage Power Dissipation.............................................. 200mW LM134 ................................................................. 40V Operating Temperature Range LM134-3/LM134-6/LM234-3/ LM134 (OBSOLETE) ................... 55 C to 125 C LM234-6/LM334 ................................................. 30V LM234-3/LM234-6 ............................25 C to 100 C + V to V Reverse Voltage ........................................ 20V LM334 ..................................................... 0 C to 70 C R Pin to V Voltage.................................................... 5V Storage Temperature Range ................. 65 C to 150 C Set Current ........................................................... 10mA Lead Temperature (Soldering, 10 sec).................. 300 C UUW PACKAGE/ORDER I FOR ATIO ORDER PART ORDER PART BOTTOM VIEW NUMBER NUMBER BOTTOM VIEW + V R V CURRENT TEMP + CURRENT TEMP V R V SOURCE SENSOR SOURCE SENSOR LM134H LM134H-3 LM334Z LM234Z-3 H PACKAGE LM334H LM234H-3 Z PACKAGE LM234Z-6 3-LEAD TO-46 METAL CAN 3-LEAD PLASTIC TO-92 LM134H-6 T = 150 C, q = 440 C/W, q = 80 C/W JMAX JA JA T = 100 C, q = 160 C/W JMAX JA LM234H-6 OBSOLETE PACKAGE Consider the S8 or Z Packages for Alternate Source ORDER PART NUMBER V 1 8 NC LM334S8 R 2 7 NC + V 3 6 NC S8 PART NC 4 5 NC MARKING S8 PACKAGE 8-LEAD PLASTIC SO T = 100 C, q = 180 C/W 334 JMAX JA Consult LTC Marketing for availability of LM234Z-3 and LM234Z-6 2 U WWW