Datasheet > LM299

LM299

更新时间： 2024-11-26 05:42:03

品牌	Logo	应用领域
美国国家半导体 - NSC		/
页数	文件大小	规格书
10页	652K
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Precision Reference

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LM299 数据手册

April 2005

LM199/LM299/LM399

Precision Reference

General Description

The LM199 series are precision, temperature-stabilized

monolithic zeners offering temperature coefficients a factor

of ten better than high quality reference zeners. Constructed

on a single monolithic chip is a temperature stabilizer circuit

and an active reference zener. The active circuitry reduces

the dynamic impedance of the zener to about 0.5Ω and

allows the zener to operate over 0.5 mA to 10 mA current

range with essentially no change in voltage or temperature

coefficient. Further, a new subsurface zener structure gives

low noise and excellent long term stability compared to

ordinary monolithic zeners. The package is supplied with a

thermal shield to minimize heater power and improve tem-

perature regulation.

power supplies. Further in many cases the LM199 can re-

place references in existing equipment with a minimum of

wiring changes.

The LM199 series devices are packaged in a standard her-

metic TO-46 package inside a thermal shield. The LM199 is

rated for operation from −55˚C to +125˚C while the LM299 is

rated for operation from −25˚C to +85˚C and the LM399 is

rated from 0˚C to +70˚C.

Features

n Guaranteed 0.0001%/˚C temperature coefficient

n Low dynamic impedance — 0.5Ω

n Initial tolerance on breakdown voltage — 2%

n Sharp breakdown at 400 µA

The LM199 series references are exceptionally easy to use

and free of the problems that are often experienced with

ordinary zeners. There is virtually no hysteresis in reference

voltage with temperature cycling. Also, the LM199 is free of

voltage shifts due to stress on the leads. Finally, since the

unit is temperature stabilized, warm up time is fast.

n Wide operating current — 500 µA to 10 mA

n Wide supply range for temperature stabilizer

n Guaranteed low noise

n Low power for stabilization — 300 mW at 25˚C

n Proven reliability, low-stress packaging in TO-46

integrated-circuit hermetic package, for low hysteresis

The LM199 can be used in almost any application in place of

ordinary zeners with improved performance. Some ideal

applications are analog to digital converters, calibration stan-

dards, precision voltage or current sources or precision

after thermal cycling. 33 million hours MTBF at T_A

+25˚C (T_J= +86˚C)

Connection Diagram

Metal Can Package (TO-46)

00571714

Top View

NS Package Number H04D

Ordering Information

Order Number Initial Tolerance Ambient Temperature Package Marking Transport Method NSC Package

LM199AH

LM199AH/883

LM299H

-50˚C to +125˚C

-25˚C to +85˚C

0˚C to +70˚C

LM199AH

LM199AH/Q

LM299H

Box of 500

Tray of 20

Box of 500

H04A

LM399AH

LM399H

LM399AH

LM399H

0˚C to +70˚C

DS005717

www.national.com

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LM2990QML	TI	获取价格	LM2990QML Negative Low Dropout Regulator
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LM2990S-12	NSC	获取价格	Negative Low Dropout Regulator

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