Datasheet LM285Z, LM285MX, LM285M, LM285BXZ, LM285BYZ Datasheet (NSC)

LM185/LM285/LM385
Adjustable Micropower Voltage References

General Description

The LM185/LM285/LM385 are micropower 3-terminal ad­justable band-gap voltage reference diodes. Operating from

1.24 to 5.3V and over a 10µA to 20mA current range, they
feature exceptionallylow dynamic impedance and good tem­perature 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 designof 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 makeportable 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.

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 package, 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

Connection Diagrams

TO-92

Plastic Package

DS005250-9

Bottom View

TO-46

Metal Can Package

DS005250-1

Bottom View

SOIC Package

DS005250-10

Top View

20-Leadless Chip Carrier

DS005250-15

Top View

February 2000

LM185/LM285/LM385 Adjustable Micropower Voltage Reference

© 2000 National Semiconductor Corporation DS005250 www.national.com

Ordering Information

Package Temperature Range NSC

Drawing

−55˚C to 125˚C −40˚C to 85˚C 0˚C to 70˚C

TO-46

LM185BH

H03H

LM185BH/883

LM185BYH

LM185BYH/883

TO-92

LM285BXZ LM385BXZ

Z03A

LM285BYZ LM385BYZ

LM285Z LM385BZ

LM385Z

8-Pin SOIC

LM285M LM385M

M08A

LM285BYM LM385BM

20-Leadless Chip
Carrier

LM185BE/883

E20A

Block Diagram

Typical Applications

DS005250-13

1.2V Reference

DS005250-14

5.0V Reference

DS005250-2

LM185/LM285/LM385

www.national.com 2

Absolute Maximum Ratings (Note 1)

If Military/Aerospace specified devices are required,
please contact the National Semiconductor SalesOffice/
Distributors for availability and specifications.

(Note 2)
Reverse Current 30mA

Forward Current 10mA

Operating Temperature Range (Note 3)

LM185 Series −55˚C to 125˚C
LM285 Series −40˚C to 85˚C
LM385 Series 0˚C to 70˚C

Storage Temperature −55˚C to 150˚C
Soldering Information

TO-92 Package (10 sec.) 260˚C
TO-46 Package (10 sec.) 300˚C
SO Package

Vapor Phase (60 sec.) 215˚C
Infrared (15 sec.) 220˚C

See An-450 “Surface Mounting Methods and Their Effect
on Product Reliability” for other methods of soldering
surface mount devices.

Electrical Characteristics (Note 4)

Parameter Conditions

LM185, LM285 LM385

Typ

LM185BX,

LM185BY

Typ

LM385BX,

LM185B,

LM285BX,

LM285

LM385BY

LM385

Units

LM285BY (Limit)

Tested Design Tested Design Tested Design Tested Design

Limit Limit Limit Limit Limit Limit Limit Limit

(Note 5) (Note 6) (Note 5) (Note 6) (Note 5) (Note 6) (Note 5) (Note 6)

Reference Voltage I

R

=

100µA 1.240 1.252 1.265 1.270 1.240 1.252 1.255 1.265 1.270 V

1.255 (max)

1.228 1.215 1.205 1.228 1.215 1.215 1.205 V

1.215 (min)

Reference Voltage I

MIN

<

I

R

<

1mA 0.2 1 1.5 1 1.5 0.2 1 1.5 1 1.5 mV

Change with Current 1mA

<

I

R

<

20mA 4 10 20 10 20 515 25 15 25 (max)

Dynamic Output I

R

=

100µA, f=100Hz

Impedance I

AC

=

0.1 I

R

V

OUT

=

V

REF

0.3 0.4

Ω

V

OUT

=

5.3V 0.7 1

Reference Voltage I

R

=

100µA mV
Change with Output 1 3 6 3 6 25 10 5 10 (max)
Voltage
Feedback Current 13 20 25 20 25 16 30 35 30 35 nA

(max)

Minimum Operating V

OUT

=

V

REF

69 10 9 10 711 13 11 13 µA

Current (see curve) V

OUT

=

5.3V 30 45 50 45 50 35 55 60 55 60 (max)

Output Wideband I

R

=

100µA, 10Hz

<f<

10kHz

Noise V

OUT

=

V

REF

50 50 µV

rms

V

OUT

=

5.3V 170 170

Average
Temperature

I

R

=

100µA X Suffix 30 30 ppm/˚c

Coefficient (Note 7) Y Suffix 50 50 (max)

All Others 150 150 150 150

Long Term Stability I

R

=

100µA, T=1000 Hr, 20 20 ppm

T

A

=

25˚C

±

0.1˚C

Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is in­tended to be functional, but do not guarantee specific performance limits. For guaranteed specifications and test conditions, see the Electrical Characteristics. The
guaranteed specifications apply only for the test conditions listed.

Note 2: Refer to RETS185H for military specifications.
Note 3: For elevated temperature operation, T

J

max is:

LM185 150˚C
LM285 125˚C
LM385 100˚C

Thermal Resistance TO-92 TO-46 SO-8

θ

JA

(Junction to Ambient) 180˚C/W (0.4" leads) 440˚C/W 165˚C/W

170˚C/W (0.125" leads)

θ

JC

(Junction to Case) N/A 80˚C/W N/A

LM185/LM285/LM385

www.national.com3

Electrical Characteristics (Note 4) (Continued)

Note 4: Parameters identifiedwith boldface type apply at temperature extremes.Allother numbers apply atT

A

=

T

J

=

25˚C. Unless otherwise specified, all param-

eters apply for V

REF

<

V

OUT

<

5.3V.

Note 5: Guaranteed and 100%production tested.
Note 6: Guaranteed, but not 100%production tested. These limits are not to be used to calculate average outgoing quality levels.
Note 7: The average temperature coefficient is defined as the maximum deviation of reference voltage at all measured temperatures from T

MIN

to T

MAX

, divided by

T

MAX−TMIN

. The measured temperatures are −55, −40, 0, 25, 70, 85, 125˚C.

Typical Performance Characteristics

Temperature Drift of 3
Representative Units

DS005250-16

Feedback Current

DS005250-17

Minimum Operating Current

DS005250-18

Reverse Characteristics

DS005250-19

Reverse Characteristics

DS005250-20

Forward Characteristics

DS005250-21

Output Noise Voltage

DS005250-22

Dynamic Output Impedance

DS005250-23

Response Time

DS005250-24

LM185/LM285/LM385

www.national.com 4

Typical Performance Characteristics (Continued)

Typical Applications

Temperature Coefficient Typical

LM185 LM285 LM385

DS005250-4

Precision 10V Reference

DS005250-25

Low AC Noise Reference

DS005250-26

25V Low Current Shunt Regulator

DS005250-27

200 mA Shunt Regulator

DS005250-28

LM185/LM285/LM385

www.national.com5

Typical Applications (Continued)

Series-Shunt 20 mA Regulator

DS005250-29

High Efficiency Low Power Regulator

DS005250-30

Voltage Level Detector

DS005250-31

Voltage Level Detector

DS005250-32

Fast Positive Clamp

2.4V + ∆V

D1

DS005250-33

Bidirectional Clamp

±

2.4V

DS005250-34

LM185/LM285/LM385

www.national.com 6

Typical Applications (Continued)

Bidirectional Adjustable Clamp

±

1.8V to±2.4V

DS005250-35

Bidirectional Adjustable Clamp

±

2.4V to±6V

DS005250-36

Simple Floating Current Detector

DS005250-37

Current Source

DS005250-38

LM185/LM285/LM385

www.national.com7

Typical Applications (Continued)

Precision Floating Current Detector

DS005250-39

*D1 can be any LED, V

F

=

1.5V to 2.2V at 3 mA. D1 may act as an indicator. D1 will be on if I

THRESHOLD

falls below the threshold current, except with I=O.

Centigrade Thermometer, 10mV/˚C

DS005250-11

Freezer Alarm

DS005250-12

LM185/LM285/LM385

www.national.com 8

Schematic Diagram

DS005250-8

LM185/LM285/LM385

www.national.com9

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

LM185/LM285/LM385

www.national.com 10

Physical Dimensions inches (millimeters) unless otherwise noted (Continued)

SO Package (M)

NS Package Number M08A

TO-92 Plastic Package (Z)
NS Package Number Z03A

LM185/LM285/LM385

www.national.com11

Notes

LIFE SUPPORT POLICY

NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT
DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL
COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein:

1. Life support devices or systems are devices or
systems which, (a) are intended for surgical implant
into the body, or (b) support or sustain life, and
whose failure to perform when properly used in
accordance with instructions for use provided in the
labeling, can be reasonably expected to result in a
significant injury to the user.

2. A critical component is any component of a life
support device or system whose failure to perform
can be reasonably expected to cause the failure of
the life support device or system, or to affect its
safety or effectiveness.

National Semiconductor
Corporation

Americas
Tel: [phone]
Fax: [phone]
Email: [e-mail]

National Semiconductor
Europe

Fax: [phone]

Email: [e-mail]
Deutsch Tel: [phone]
English Tel: [phone]
Français Tel: [phone]

National Semiconductor
Asia Pacific Customer
Response Group

Tel: [phone]
Fax: [phone]
Email: [e-mail]

National Semiconductor
Japan Ltd.

Tel: [phone]
Fax: [phone]

www.national.com

LM185/LM285/LM385 Adjustable Micropower Voltage Reference

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.