LM385BYZ National Semiconductor, LM385BYZ Datasheet

LM385BYZ

Manufacturer Part Number

LM385BYZ

Description

Adjustable Micropower Voltage References

Manufacturer

National Semiconductor

Datasheet

1.LM385BYZ.pdf (12 pages)

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LM185/LM285/LM385

Adjustable Micropower Voltage References

General Description

The LM185/LM285/LM385 are micropower 3-terminal ad-

justable band-gap voltage reference diodes. Operating from

1.24 to 5.3V and over a 10µA to 20mA current range, they

feature exceptionally low dynamic impedance and good tem-

perature 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 refer-

ence 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 ana-

log circuitry with battery life approaching shelf life. Further,

the wide operating current allows it to replace older refer-

ences with a tighter tolerance part.

Connection Diagrams

Metal Can Package

Plastic Package

Bottom View

TO-92

TO-46

DS005250-9

DS005250-1

DS005250

The LM185 is rated for operation over a −55˚C to 125˚C tem-

perature range, while the LM285 is rated −40˚C to 85˚C and

the LM385 0˚C to 70˚C. The LM185 is available in a hermetic

TO-46 package and a leadless chip carrier package, while

the LM285/LM385 are available in a low-cost TO-92 molded

package, as well as S.O.

Features

n Adjustable from 1.24V to 5.30V

n Operating current of 10µA to 20mA

n 1% and 2% initial tolerance

n 1

n Low temperature coefficient

dynamic impedance

20-Leadless Chip Carrier

SOIC Package

Top View

DS005250-10

DS005250-15

February 2000

www.national.com

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