1 Features

• 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
• 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.

1. For all available packages, see the orderable addendum at the end of the datasheet.

4 Simplified Schematic