LM185-1.2/ LM285-1.2/LM385-1.2 Micropower Voltage Reference FEATURES DESCRIPTIO n 10m A to 20mA Operating Range The LM185-1.2 is a two terminal band gap reference diode n Guaranteed 1% Initial Voltage Tolerance that has been designed for applications which require n Guaranteed 1W Dynamic Impedance precision performance with micropower operation. The n Very Low Power Consumption device provides guaranteed operating specifications at currents as low as 10m A. The nominal voltage is 1.235V U with both 1% and 2% tolerances available. Some addi- APPLICATIO S tional features are: maximum dynamic impedance of 1W , n Portable Meter References low noise and excellent stability over time and tempera- n Portable Test Instruments ture. Advanced design, processing and testing techniques n Battery Operated Systems make Linears LM185-1.2 a superior choice over previous n Current Loop Instrumentation designs. A micropower 5V reference application is shown below. For guaranteed TC, micropower references, see the LT1034 data sheet. , LTC and LT are registered trademarks of Linear Technology Corporation. TYPICAL APPLICATIO Reverse Voltage Change with Current Micropower 5V Reference V IN 10 T = 25C 7V TO 15V A + V 8 R LM334 6 5.6k V 7 3 4 + 6 5V LT1494 2 2 LM385-1.2 4 3.01M 150pF 1% 0 1M 1% 2 185/285/385 TA01a 0.01 0.1 1 10 100 REVERSE CURRENT (mA) 185/285/385 TA01b 1 OUTPUT VOLTAGE CHANGE (mV) U ULM185-1.2/ LM285-1.2/LM385-1.2 ABSOLUTE AXI U RATI GS Operating Temperature Range Storage Temperature Range ................. 65 C to 150 C LM185-1.2(OBSOLETE) ............... 55 C to 125 C Lead Temperature (Soldering, 10 sec).................. 300 C LM285-1.2 ..........................................40 C to 85 C Reverse Breakdown Current ................................. 30mA LM385-1.2 .............................................. 0 C to 70 C Forward Current ................................................... 10mA UUW PACKAGE/ORDER I FOR ATIO BOTTOM VIEW ORDER PART ORDER PART BOTTOM VIEW NUMBER NUMBER 12 LM185H-1.2 LM285Z-1.2 LM285H-1.2 LM385Z-1.2 LM385H-1.2 LM385BZ-1.2 Z PACKAGE H PACKAGE LM385BH-1.2 3-LEAD PLASTIC TO-92 2-LEAD TO-46 METAL CAN T = 150 C, JMAX T = 150 C, q = 160 C/W JMAX JA q = 440 C/W, q = 80 C/W JA JC (NOTE 3) (NOTE 3) OBSOLETE PACKAGE Consider the S8 or Z Packages for Alternate Source ORDER PART NUMBER TOP VIEW NC 1 8 LM385BS8-1.2 NC 2 7 NC LM385S8-1.2 NC 3 6 S8 PART 4 5 NC (DO MARKING NOT USE) S8 PACKAGE 8-LEAD PLASTIC SO 3851 T = 150 C, q = 190 C/W JMAX JA 3851B Consult LTC Marketing for parts specified with wider operating temperature ranges. 2 U WWW