lm185byh-883 National Semiconductor Corporation, lm185byh-883 Datasheet

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lm185byh-883

Manufacturer Part Number
lm185byh-883
Description
Adjustable Micropower Voltage Reference
Manufacturer
National Semiconductor Corporation
Datasheet
1.LM185BYH-883.pdf (14 pages)
© 2005 National Semiconductor Corporation
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
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 makes it useful
for micropower circuitry. This voltage reference can be used
to make portable meters, regulators or general purpose
Connection Diagrams
Plastic Package
SOIC Package
Bottom View
Top View
TO-92
00525009
00525010
DS005250
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.
The LM185 is rated for operation over a −55˚C to 125˚C
temperature 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 pack-
age, 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 1Ω dynamic impedance
n Low temperature coefficient
20-Leadless Chip Carrier
Metal Can Package
Bottom View
Top View
TO-46
00525001
00525015
February 2005
www.national.com

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lm185byh-883 Summary of contents

Page 1

... Bottom View SOIC Package Top View © 2005 National Semiconductor Corporation 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. The LM185 is rated for operation over a −55˚C to 125˚C temperature range, while the LM285 is rated − ...

Page 2

... Ordering Information Package −55˚C to 125˚C LM185BH LM185BH/883 TO-46 LM185BYH LM185BYH/883 TO-92 8-Pin SOIC 20-Leadless Chip LM185BE/883 Carrier Block Diagram Typical Applications 1.2V Reference 00525014 www.national.com Temperature Range −40˚C to 85˚C 0˚C to 70˚C LM285BXZ LM385BXZ LM285BYZ LM385BYZ LM285Z LM385BZ LM385Z LM285M ...

Page 3

Absolute Maximum Ratings If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. (Note 2) Reverse Current Forward Current Operating Temperature Range (Note 3) LM185 Series LM285 Series LM385 Series Electrical Characteristics ...

Page 4

Electrical Characteristics Parameter Conditions Average I = 100µA X Suffix R Temperature Coefficient Y Suffix (Note 7) All Others Long Term I = 100µ 1000 R Stability Hr, ± 25˚C 0.1˚C A Note 1: Absolute Maximum ...

Page 5

Typical Performance Characteristics Temperature Drift of 3 Representative Units Minimum Operating Current Reverse Characteristics 00525016 Reverse Characteristics 00525018 Forward Characteristics 00525020 5 Feedback Current 00525017 00525019 00525021 www.national.com ...

Page 6

Typical Performance Characteristics Output Noise Voltage Response Time www.national.com (Continued) Dynamic Output Impedance 00525022 00525024 Temperature Coefficient Typical LM185 LM285 LM385 6 00525023 00525004 ...

Page 7

Typical Applications Precision 10V Reference 00525025 25V Low Current Shunt Regulator 00525027 7 Low AC Noise Reference 00525026 200 mA Shunt Regulator 00525028 www.national.com ...

Page 8

Typical Applications Series-Shunt 20 mA Regulator Voltage Level Detector Fast Positive Clamp 2.4V + ∆V D1 www.national.com (Continued) High Efficiency Low Power Regulator 00525029 00525031 00525033 8 00525030 Voltage Level Detector 00525032 Bidirectional Clamp ± 2.4V 00525034 ...

Page 9

Typical Applications (Continued) Bidirectional Adjustable Clamp ± ± 1.8V to 2.4V Simple Floating Current Detector Bidirectional Adjustable Clamp 00525035 00525037 9 ± ± 2. 00525036 Current Source 00525038 www.national.com ...

Page 10

Typical Applications *D1 can be any LED, V =1. mA. D1 may act as an indicator. D1 will Centigrade Thermometer, 10mV/˚C www.national.com (Continued) Precision Floating Current Detector THRESHOLD 00525011 10 00525039 ...

Page 11

Schematic Diagram 00525008 11 www.national.com ...

Page 12

Physical Dimensions unless otherwise noted www.national.com inches (millimeters) 20-Leadless Chip Carrier (E) NS Package Number E20A TO-46 Metal Can Package (H) NS Package Number H03H 12 ...

Page 13

Physical Dimensions inches (millimeters) unless otherwise noted (Continued) SO Package (M) NS Package Number M08A TO-92 Plastic Package (Z) NS Package Number Z03A 13 www.national.com ...

Page 14

National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications. For the most current product information ...

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