LM385BZ1.2 National Semiconductor, LM385BZ1.2 Datasheet

LM385BZ1.2

Manufacturer Part Number

LM385BZ1.2

Description

Manufacturer

National Semiconductor

Datasheet

1.LM385M3X-1.2.pdf (11 pages)

Specifications of LM385BZ1.2

Case

TO92-3

Date_code

2003+

Current page: 1 of 11
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LM185-1.2/LM285-1.2/LM385-1.2

Micropower Voltage Reference Diode

General Description

The

2-terminal band-gap voltage regulator diodes. Operating

over a 10µA to 20mA current range, they feature exception-

ally low dynamic impedance and good temperature stability.

On-chip trimming is used to provide tight voltage tolerance.

Since the LM185-1.2 band-gap reference uses only transis-

tors and resistors, low noise and good long term stability

result.

Careful design of the LM185-1.2 has made the device ex-

ceptionally 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 LM185-1.2 makes it

useful for micropower circuitry. This voltage reference can be

used to make portable meters, regulators or general purpose

analog circuitry with battery life approaching shelf life.

Further, the wide operating current allows it to replace older

references with a tighter tolerance part.

Connection Diagrams

LM185-1.2/LM285-1.2/LM385-1.2

LM385BXZ-1.2 or LM385BYZ-1.2

See NS Package Number Z03A

LM285BXZ-1.2, LM285BYZ-1.2

Order Number LM285Z-1.2,

LM385Z-1.2, LM385BZ-1.2

Plastic Package (Z)

Bottom View

T0-92

00551810

DS005518

are

micropower

The LM185-1.2 is rated for operation over a −55˚C to 125˚C

temperature range while the LM285-1.2 is rated −40˚C to

85˚C and the LM385-1.2 0˚C to 70˚C. The LM185-1.2/

LM285-1.2 are available in a hermetic TO-46 package and

the LM285-1.2/LM385-1.2 are also available in a low-cost

TO-92 molded package, as well as SO and SOT-23. The

LM185-1.2 is also available in a hermetic leadless chip

carrier package.

Features

n Operating current of 10µA to 20mA

n 1Ω dynamic impedance

n Low temperature coefficient

n Low voltage reference — 1.235V

n 2.5V device and adjustable device also available

n LM185-2.5 series and LM185 series, respectively

* Pin 3 is attached to the Die Attach Pad (DAP) and should be connected

to Pin 2 or left floating.

1% and 2% initial tolerance

See NS Package Number MF03A

Order Number LM385M3-1.2

SOT23

00551833

February 2005

www.national.com

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