LM385BM National Semiconductor, LM385BM Datasheet

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LM385BM

Manufacturer Part Number
LM385BM
Description
LM185/LM285/LM385 Adjustable Micropower Voltage References; Package: SOIC NARROW; No of Pins: 8; Qty per Container: 95; Container: Rail
Manufacturer
National Semiconductor
Datasheet

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© 2008 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 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
Connection Diagrams
Plastic Package
SOIC Package
Bottom View
Top View
TO-92
525009
5250
525010
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 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
Adjustable from 1.24V to 5.30V
Operating current of 10μA to 20mA
1% and 2% initial tolerance
1Ω dynamic impedance
Low temperature coefficient
20-Leadless Chip Carrier
Metal Can Package
Bottom View
Top View
TO-46
525001
525015
January 30, 2008
www.national.com

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LM385BM Summary of contents

Page 1

... Bottom View SOIC Package Top View © 2008 National Semiconductor Corporation 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 tem- perature range, while the LM285 is rated −40°C to 85°C and the LM385 0° ...

Page 2

... 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 www.national.com Temperature Range 0°C to 70°C LM285BXZ LM285BYZ LM285Z LM285M LM285BYM 525013 525014 2 NSC Drawing H03H LM385BXZ LM385BYZ Z03A LM385BZ LM385Z LM385M M08A LM385BM E20A 5.0V Reference 525002 ...

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... 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 Parameter Conditions = 100μA ...

Page 4

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

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Typical Performance Characteristics Temperature Drift of 3 Representative Units Minimum Operating Current Reverse Characteristics Feedback Current 525016 Reverse Characteristics 525018 Forward Characteristics 525020 5 525017 525019 525021 www.national.com ...

Page 6

Output Noise Voltage Response Time www.national.com Dynamic Output Impedance 525022 525024 Temperature Coefficient Typical LM185 LM285 LM385 6 525023 525004 ...

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Typical Applications Precision 10V Reference 25V Low Current Shunt Regulator 525025 525027 7 Low AC Noise Reference 525026 200 mA Shunt Regulator 525028 www.national.com ...

Page 8

Series-Shunt 20 mA Regulator Voltage Level Detector Fast Positive Clamp 2.4V + ΔV www.national.com 525029 525031 D1 525033 8 High Efficiency Low Power Regulator Voltage Level Detector 525032 Bidirectional Clamp ±2.4V 525034 525030 ...

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Bidirectional Adjustable Clamp ±1.8V to ±2.4V 525035 Simple Floating Current Detector Precision Floating Current Detector Bidirectional Adjustable Clamp ±2.4V to ±6V Current Source 525037 525039 9 525036 525038 www.national.com ...

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LED, V =1. mA. D1 may act as an indicator. D1 will Centigrade Thermometer, 10mV/°C Schematic Diagram www.national.com falls below the threshold current, except with I=O. THRESHOLD ...

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Physical Dimensions inches (millimeters) unless otherwise noted 20-Leadless Chip Carrier (E) NS Package Number E20A TO-46 Metal Can Package (H) NS Package Number H03H 11 www.national.com ...

Page 12

SO Package (M) NS Package Number M08A TO-92 Plastic Package (Z) NS Package Number Z03A 12 ...

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Notes 13 www.national.com ...

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... For more National Semiconductor product information and proven design tools, visit the following Web sites at: Products Amplifiers www.national.com/amplifiers Audio www.national.com/audio Clock Conditioners www.national.com/timing Data Converters www.national.com/adc Displays www.national.com/displays Ethernet www.national.com/ethernet Interface www.national.com/interface LVDS www.national.com/lvds Power Management www.national.com/power Switching Regulators www.national.com/switchers LDOs www ...

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