1 Features

1• Operating Current Range

– LM285-1.2: 10 μA to 20 mA

– LM385-1.2: 15 μA to 20 mA

– LM385B-1.2: 15 μA to 20 mA band•

1% and 2% Initial Voltage Tolerance

• Reference Impedance

– LM385-1.2: 1 Ω MAX at 25°C

– All devices: 1.5 Ω MAX over Full

Temperature Range

• Very Low Power Consumption

• Interchangeable with Industry Standard

LM285-1.2 and LM385-1.2

2 Applications

• Portable Meter References

• Portable Test Instruments

• Battery-Operated Systems

• Current-Loop Instrumentation

• Panel Meters

3 Description

These micropower, two-terminal, band-gap voltage

references operate over a 10-μA to 20-mA current range and feature exceptionally low dynamic

impedance and good temperature stability. On-chip

trimming provides tight voltage tolerance. The band•

gap reference for these devices has low noise and long-term stability.

The design makes these devices exceptionally tolerant of capacitive loading and, thus, easier to use

in most reference applications. The wide dynamic

operating temperature range accommodates varying

current supplies, with excellent regulation.

The extremely low power drain of this series makes

them useful for micropower circuitry. These voltage

references can be used to make portable meters,

regulators, or general-purpose analog circuitry, with

battery life approaching shelf life. The wide operating

current range allows them to replace older references

with tighter-tolerance parts.