LM285 Datasheet | National Semiconductor

Description The LM185/LM285/LM385 are micropower 3- terminal adjustable band-gap voltage reference diodes. Operating from 1.24 to 5.3V and over a 10 /LA to 20 m A current range, they feature exceptionally low dynamic impedance and good temperature stability. On-chip trimming is used to provide tight voltage tolerance. Since the LM185 band-gap reference uses only transistors and resistors, low noise and good long-term stability result. Careful design of the LM185 has made the device tolerant of capacitive loading, making it easy to use in almost any reference application. The wide dynamic operating range allows its use with widely varying supplies with excellent regulation. The extremely low power drain of the LM185 makes it useful for micropower circuitry. This voltage reference can be used to make portable meters, regulators or general purpose an- alog circuitry with battery life approaching shelf life. Further, the wide operating current allows it to replace older references with a tighter tolerance part. The LM185 is rated for operation over a -55'C to 125'C temperature range, while the LM285 is rated -40'C to 85'C and the LM385 O'C to 70'C. The LM185 is available in a hermetic TO-46 package and the LM285/LM385 are available in a low-cost TO-92 molded package, as well as S.O. Features III Adjustable from 1.24V to 5.30V III Operating current of 10 /LA to 20 m A III 1% and 2% initial tolerance III 1 n dynamic impedance II Low temperature coefficient Connection Diagrams TO-92 Plastic Package TO-46 Metal Can Package SO Package + NC NC ADJ 8 TLIH/5250-9 Bottom View Order Number LM285BXZ, LM285BYZ, LM285Z, LM385BXZ, LM385BYZ or LM385Z See NS Package Number Z03A TL/H/5250-1 Bottom View Order Number LM185BH, LM185BXH or LM185BYH See NS Package Number H03A Block Diagram Typical Applications 1.2V Reference 9V H1 500k . . . . .- - 1 . 2 V + TLi H/5250-10 Order Number LM285M or LM385M See NS Package Number M08A 5.0V Reference 9V (~+ H1 VOUT=...