LM285MX-2.5/NOPB National Semiconductor, LM285MX-2.5/NOPB Datasheet

LM285MX-2.5/NOPB

Manufacturer Part Number

LM285MX-2.5/NOPB

Description

IC VOLT REF MICROPWR 2.5V 8SOIC

Manufacturer

National Semiconductor

Datasheet

1.LM385MX-2.5NOPB.pdf (16 pages)

Specifications of LM285MX-2.5/NOPB

Reference Type

Shunt

Voltage - Output

2.5V

Tolerance

±1.5%

Temperature Coefficient

150ppm/°C

Number Of Channels

Current - Cathode

20µA

Current - Output

20mA

Operating Temperature

-40°C ~ 85°C

Mounting Type

Surface Mount

Package / Case

8-SOIC (3.9mm Width)

Fixed / Adjust / Prog

Precision

Output Voltage (max)

2.5V

Reference Voltage Accuracy (max)

1.5

Load Regulation

10mV

Operating Temp Range

-40C to 85C

Operating Temperature Classification

Industrial

Mounting

Surface Mount

Pin Count

Package Type

SOIC N

Leaded Process Compatible

Yes

Rohs Compliant

Yes

Peak Reflow Compatible (260 C)

Yes

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

Voltage - Input

Current - Quiescent

Lead Free Status / Rohs Status

Compliant

Other names

LM285MX-2.5
LM285MX-2.5TR

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LM185-2.5/LM285-2.5/LM385-2.5

Micropower Voltage Reference Diode

General Description

The LM185-2.5/LM285-2.5/LM385-2.5 are micropower 2-ter-

minal band-gap voltage regulator diodes. Operating over a 20

μA to 20 mA current range, they feature exceptionally low dy-

namic impedance and good temperature stability. On-chip

trimming is used to provide tight voltage tolerance. Since the

LM-185-2.5 band-gap reference uses only transistors and re-

sistors, low noise and good long term stability result.

Careful design of the LM185-2.5 has made the device excep-

tionally tolerant of capacitive loading, making it easy to use in

almost any reference application. The wide dynamic operat-

ing 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 re-

quiring 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.

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

551908

5519

See NS Package Number MA03B

Order Number LM385M3-2.5

SOT-23

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

■

551929

±20 mV (±0.8%) max. initial tolerance (A grade)

Operating current of 20 μA to 20 mA

0.6Ω dynamic impedance (A grade)

Low temperature coefficient

Low voltage reference—2.5V

1.2V device and adjustable device also available—

LM185-1.2 series and LM185 series, respectively

LM385BXM-2.5 or LM385BYM-2.5

See NS Package Number M08A

LM285BXM-2.5, LM285BYM-2.5

Order Number LM285M-2.5,

LM385M-2.5, LM385BM-2.5

SO Package

551911

January 30, 2008

www.national.com

Related parts for LM285MX-2.5/NOPB

LM285MX-2.5/NOPB Summary of contents

Page 1

... See NS Package Number Z03A * Pin 3 is attached to the Die Attach Pad (DAP) and should be connected to Pin 2 or left floating. © 2008 National Semiconductor Corporation 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° ...

Page 2

LCC Leadless Chip Carrier Order Number LM185E-2.5/883 See NS Package Number E20A www.national.com LM185H-2.5/883, LM185BXH-2.5, LM185BXH-2.5/883, LM185BYH-2.5, LM185BYH2.5/883, LM285H-2.5, 551914 See NS Package Number H02A 2 TO-46 Metal Can Package 551913 Bottom View Order Number LM185H-2.5, or LM285BYH-2.5 ...

Page 3

... Absolute Maximum Ratings If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Reverse Current Forward Current Operating Temperature Range (Note 3) LM185-2.5 LM285-2.5 LM385-2.5 Electrical Characteristics (Note 4) Parameter Reverse Breakdown I R Voltage Minimum Operating ...

Page 4

Electrical Characteristics Parameter Conditions Reverse T = 25°C, A Breakdown ≤ ≤ 20 μA Voltage Minimum Operating Current LM385M3-2.5 ≤ ≤ 20 μA Reverse Breakdown Voltage ≤ ≤ Change with 1 mA ...

Page 5

Typical Performance Characteristics Reverse Characteristics Forward Characteristics Reverse Dynamic Impedance Reverse Characteristics 551915 Temperature Drift 551917 Reverse Dynamic 551919 5 551916 551918 Impedance 551920 www.national.com ...

Page 6

Noise Voltage Response Time Applications Wide Input Range Reference 551912 Micropower Reference from 9V Battery 551902 www.national.com Filtered Output Noise 551921 551923 LM385-2.5 Applications Micropower 5V Reference ≃ 40 μA Note 10 551922 551909 ...

Page 7

Note 11 PRECISION 1 μ CURRENT SOURCES Micropower 10V Reference 551910 551924 7 551925 www.national.com ...

Page 8

METER THERMOMETERS Calibration 1. Short LM385-2.5, adjust R3 for I =temp at 1μA/°K OUT Remove short, adjust R2 for correct reading in centigrade Calibration =temp at 1.8 μA/°K 1. Short LM385-2.5, adjust R3 for I OUT Remove short, adjust R2 ...

Page 9

Micropower Thermocouple Cold Junction Compensator Adjustment Procedure 1. Adjust TC ADJ pot until voltage across R1 equals Kelvin temperature multiplied by the thermocouple Seebeck coefficient. 2. Adjust zero ADJ pot until voltage across R2 equals the thermocouple Seebeck coefficient multiplied ...

Page 10

Schematic Diagram www.national.com 551901 10 ...

Page 11

Physical Dimensions inches (millimeters) unless otherwise noted Order Number LM185H-2.5, LM185H-2.5/883, LM185BXH-2.5, LM185BXH-2.5/883, LM185BYH-2.5, LM185BYH-2.5/883, LM285H-2.5, or LM285BYH-2.5 Order Number LM185E-2.5/883 NS Package Number E20A TO-46 Metal Can Package (H) NS Package Number H02A 11 www.national.com ...

Page 12

SOT-23 Package (M3) Order Number LM385M3-2.5 NS Package Number MA03B 12 ...

Page 13

Small Outline (SO-8) Package (M) Order Number LM285M-2.5, LM285BXM-2.5, LM285BYM-2.5, LM385M-2.5, LM385BM-2.5, LM385BXM-2.5 or LM385BYM-2.5 NS Package Number M08A 13 www.national.com ...

Page 14

Order Number LM285Z-2.5, LM285BXZ-2.5, LM285BYZ-2.5, www.national.com TO-92 Plastic Package (Z) LM385Z-2.5, LM385AXZ-2.5, LM385AYZ-2.5, LM385BZ-2.5, LM385BXZ-2.5 or LM385BYZ-2.5 NS Package Number Z03A 14 ...

Page 15

Notes 15 www.national.com ...

Page 16

... 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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