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LM285-1.2, LM385-1.2, LM385B-1.2SLVS075J APRIL 1989REVISED JANUARY 2015

LMx85-1.2, LM385B-1.2 Micropower Voltage References1 Features 3 Description

These micropower, two-terminal, band-gap voltage1 Operating Current Range

references operate over a 10-A to 20-mA current LM285-1.2: 10 A to 20 mA range and feature exceptionally low dynamic LM385-1.2: 15 A to 20 mA impedance and good temperature stability. On-chip

trimming provides tight voltage tolerance. The band- LM385B-1.2: 15 A to 20 mAgap reference for these devices has low noise and 1% and 2% Initial Voltage Tolerance long-term stability.

Reference ImpedanceThe design makes these devices exceptionally LM385-1.2: 1 MAX at 25C tolerant of capacitive loading and, thus, easier to use

All devices: 1.5 MAX over Full in most reference applications. The wide dynamicTemperature Range operating temperature range accommodates varying

current supplies, with excellent regulation. Very Low Power Consumption Interchangeable with Industry Standard The extremely low power drain of this series makes

them useful for micropower circuitry. These voltageLM285-1.2 and LM385-1.2references can be used to make portable meters,regulators, or general-purpose analog circuitry, with2 Applicationsbattery life approaching shelf life. The wide operating

Portable Meter References current range allows them to replace older referenceswith tighter-tolerance parts. Portable Test Instruments

Battery-Operated SystemsDevice Information(1)

Current-Loop InstrumentationPART NUMBER PACKAGE (PIN) BODY SIZE (NOM)

Panel MetersSOIC (8) 4.90 mm 3.91 mmSOP (8) 6.20 mm 5.30 mm

LMx85-1.2TSSOP (8) 3.00 mm 4.40 mmTO-226 (3) 4.30 mm 4.30 mm

(1) For all available packages, see the orderable addendum atthe end of the datasheet.

4 Simplified Schematic

1

An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,intellectual property matters and other important disclaimers. PRODUCTION DATA.

http://www.ti.com/product/lm285-1.2?qgpn=lm285-1.2http://www.ti.com/product/lm385-1.2?qgpn=lm385-1.2http://www.ti.com/product/lm385b-1.2?qgpn=lm385b-1.2

LM285-1.2, LM385-1.2, LM385B-1.2SLVS075J APRIL 1989REVISED JANUARY 2015 www.ti.com

Table of Contents8.3 Feature Description................................................... 71 Features .................................................................. 18.4 Device Functional Modes.......................................... 72 Applications ........................................................... 1

9 Application and Implementation .......................... 83 Description ............................................................. 19.1 Application Information.............................................. 84 Simplified Schematic............................................. 19.2 Typical Application ................................................... 85 Revision History..................................................... 29.3 System Examples ................................................... 106 Pin Configuration and Functions ......................... 3

10 Power Supply Recommendations ..................... 117 Specifications......................................................... 411 Layout................................................................... 117.1 Absolute Maximum Ratings ...................................... 4

11.1 Layout Guidelines ................................................. 117.2 ESD Ratings.............................................................. 411.2 Layout Example .................................................... 117.3 Recommended Operating Conditions....................... 4

12 Device and Documentation Support ................. 127.4 Thermal Information .................................................. 412.1 Related Links ........................................................ 127.5 Electrical Characteristics........................................... 512.2 Trademarks ........................................................... 127.6 Typical Characteristics .............................................. 512.3 Electrostatic Discharge Caution............................ 128 Detailed Description .............................................. 712.4 Glossary ................................................................ 128.1 Overview ................................................................... 7

13 Mechanical, Packaging, and Orderable8.2 Functional Block Diagram ......................................... 7Information ........................................................... 12

5 Revision History

Changes from Revision I (December 2005) to Revision J Page

Added Applications, Device Information table, Pin Functions table, ESD Ratings table, Thermal Information table,Typical Characteristics, Feature Description section, Device Functional Modes, Application and Implementationsection, Power Supply Recommendations section, Layout section, Device and Documentation Support section, andMechanical, Packaging, and Orderable Information section. ................................................................................................. 1

Deleted Ordering Information table. ....................................................................................................................................... 1

2 Submit Documentation Feedback Copyright 19892015, Texas Instruments Incorporated

Product Folder Links: LM285-1.2 LM385-1.2 LM385B-1.2

http://www.ti.com/product/lm285-1.2?qgpn=lm285-1.2http://www.ti.com/product/lm385-1.2?qgpn=lm385-1.2http://www.ti.com/product/lm385b-1.2?qgpn=lm385b-1.2http://www.ti.comhttp://www.go-dsp.com/forms/techdoc/doc_feedback.htm?litnum=SLVS075J&partnum=LM285-1.2http://www.ti.com/product/lm285-1.2?qgpn=lm285-1.2http://www.ti.com/product/lm385-1.2?qgpn=lm385-1.2http://www.ti.com/product/lm385b-1.2?qgpn=lm385b-1.2

LM285-1.2, LM385-1.2, LM385B-1.2www.ti.com SLVS075J APRIL 1989REVISED JANUARY 2015

6 Pin Configuration and Functions

Pin FunctionsPIN

TYPE DESCRIPTIONNAME LP D, PS or PWANODE 1 4 I Shunt Current/Voltage inputCATHODE 2 8 O Common pin, normally connected to groundNC 3 1, 2, 3, 5, 6, 7 No internal connection

Copyright 19892015, Texas Instruments Incorporated Submit Documentation Feedback 3

Product Folder Links: LM285-1.2 LM385-1.2 LM385B-1.2

http://www.ti.com/product/lm285-1.2?qgpn=lm285-1.2http://www.ti.com/product/lm385-1.2?qgpn=lm385-1.2http://www.ti.com/product/lm385b-1.2?qgpn=lm385b-1.2http://www.ti.comhttp://www.go-dsp.com/forms/techdoc/doc_feedback.htm?litnum=SLVS075J&partnum=LM285-1.2http://www.ti.com/product/lm285-1.2?qgpn=lm285-1.2http://www.ti.com/product/lm385-1.2?qgpn=lm385-1.2http://www.ti.com/product/lm385b-1.2?qgpn=lm385b-1.2

LM285-1.2, LM385-1.2, LM385B-1.2SLVS075J APRIL 1989REVISED JANUARY 2015 www.ti.com

7 Specifications

7.1 Absolute Maximum Ratingsover operating free-air temperature range (unless otherwise noted) (1)

MIN MAX UNITIR Reverse Current 30 mAIF Forward Current 10 mATJ Operating virtual junction temperature 150 CTstg Storage temeprature 65 150 C

(1) Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratingsonly, which do not imply functional operation of the device at these or any other conditions beyond those indicated under RecommendedOperating Conditions. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

7.2 ESD RatingsVALUE UNIT

Human body model (HBM), per ANSI/ESDA/JEDEC JS-001, all pins (1) 2000V(ESD) Electrostatic discharge VCharged device model (CDM), per JEDEC specification JESD22-C101, 1000all pins (2)

(1) JEDEC document JEP155 states that 500-V HBM allows safe manufacturing with a standard ESD control process.(2) JEDEC document JEP157 states that 250-V CDM allows safe manufacturing with a standard ESD control process.

7.3 Recommended Operating Conditionsover operating free-air temperature range (unless otherwise noted)

MIN MAX UNITIZZ Reference current 0.01 20 mA

LM285-1.2 40 85TA Operating free-air temperature CLM385-1.2, LM385B-1.2 0 70

7.4 Thermal InformationLMx85-1.2

THERMAL METRIC (1) D LP PS PW UNIT8 PINS 3 PINS 8 PINS 8 PINS

RJA Junction-to-ambient thermal resistance 97 140 95 149 C/W

(1) For more information about traditional and new thermal metrics, see the IC Package Thermal Metrics application report, SPRA953.

4 Submit Documentation Feedback Copyright 19892015, Texas Instruments Incorporated

Product Folder Links: LM285-1.2 LM385-1.2 LM385B-1.2

http://www.ti.com/product/lm285-1.2?qgpn=lm285-1.2http://www.ti.com/product/lm385-1.2?qgpn=lm385-1.2http://www.ti.com/product/lm385b-1.2?qgpn=lm385b-1.2http://www.ti.comhttp://www.ti.com/lit/pdf/spra953http://www.go-dsp.com/forms/techdoc/doc_feedback.htm?litnum=SLVS075J&partnum=LM285-1.2http://www.ti.com/product/lm285-1.2?qgpn=lm285-1.2http://www.ti.com/product/lm385-1.2?qgpn=lm385-1.2http://www.ti.com/product/lm385b-1.2?qgpn=lm385b-1.2

LM285-1.2, LM385-1.2, LM385B-1.2www.ti.com SLVS075J APRIL 1989REVISED JANUARY 2015

7.5 Electrical Characteristicsover operating free-air temperature range (unless otherwise noted)

LM285-1.2 LM385-1.2 LM385B-1.2PARAMETER TEST CONDITIONS TA(1) UNITMIN TYP MAX MIN TYP MAX MIN TYP MAX

VZ Reference voltage IZ = I(min) to 20 mA (2) 25C 1.223 1.235 1.247 1.21 1.235 1.26 1.223 1.235 1.247 V

Average temperature Full ppm/VZ coe