LM285BYZ-2.5 National Semiconductor, LM285BYZ-2.5 Datasheet

LM285BYZ-2.5

Manufacturer Part Number

LM285BYZ-2.5

Description

Voltage Reference

Manufacturer

National Semiconductor

Datasheets

1.LM285BXZ-2.5.pdf (13 pages)

2.LM285BXZ-2.5.pdf (14 pages)

Specifications of LM285BYZ-2.5

Peak Reflow Compatible (260 C)

Leaded Process Compatible

Reference Volt Tolerance Â±%

0.8%

Mounting Type

Through Hole

Supply Current

10mA

Package / Case

3-TO-92

Voltage Reference Type

Shunt

Lead Free Status / RoHS Status

Contains lead / RoHS non-compliant

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LM185-2.5/LM285-2.5/LM385-2.5

Micropower Voltage Reference Diode

General Description

The

2-terminal band-gap voltage regulator diodes. Operating

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

tionally low dynamic impedance and good temperature sta-

bility. On-chip trimming is used to provide tight voltage toler-

ance. Since the LM-185-2.5 band-gap reference uses only

transistors and resistors, low noise and good long term

stability result.

Careful design of the LM185-2.5 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 LM185-2.5 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. Fur-

ther, the wide operating current allows it to replace older

references with a tighter tolerance part. For applications

requiring 1.2V see LM185-1.2.

Connection Diagrams

* Pin 3 is attached to the Die Attach Pad (DAP) and should be connected to Pin 2 or left floating.

LM185-2.5/LM285-2.5/LM385-2.5

LM385BXZ-2.5 or LM385BYZ-2.5

See NS Package Number Z03A

LM285BXZ-2.5, LM285BYZ-2.5

LM385AYZ-2.5, LM385BZ-2.5,

Order Number LM285Z-2.5,

LM385Z-2.5, LM385AXZ-2.5

Plastic Package

Bottom View

TO-92

00551908

DS005519

are

See NS Package Number MA03B

Order Number LM385M3-2.5

micropower

SOT-23

00551929

The LM185-2.5 is rated for operation over a −55˚C to 125˚C

temperature range while the LM285-2.5 is rated −40˚C to

85˚C and the LM385-2.5 0˚C to 70˚C. The LM185-2.5/

LM285-2.5 are available in a hermetic TO-46 package and

the LM285-2.5/LM385-2.5 are also available in a low-cost

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

LM185-2.5 is also available in a hermetic leadless chip

carrier package.

Features

n Operating current of 20 µA to 20 mA

n 0.6Ω dynamic impedance (A grade)

n Low temperature coefficient

n Low voltage reference — 2.5V

n 1.2V device and adjustable device also

available — LM185-1.2 series and LM185 series,

respectively

20 mV (

LM385BXM-2.5 or LM385BYM-2.5

See NS Package Number M08A

LM285BXM-2.5, LM285BYM-2.5

0.8%) max. initial tolerance (A grade)

Order Number LM285M-2.5,

LM385M-2.5, LM385BM-2.5

SO Package

00551911

February 2005

www.national.com

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