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LM185/LM285/LM385 Adjustable Micropower Voltage Reference

February 2005

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

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

Adjustable from 1.24V to 5.30V

Operating current of 10µA to 20mA

1% and 2% initial tolerance

1Ω dynamic impedance

Low temperature coefficient

Connection Diagrams

TO-92

Plastic Package

TO-46

Metal Can Package

00525009

Bottom View

00525001

Bottom View

20-Leadless Chip Carrier

SOIC Package

00525010

Top View

00525015

DS005250

www.national.com

LM185/LM285/LM385

Ordering Information

Package

−55˚C to 125˚C

LM185BH

TO-46

LM185BH/883

LM185BYH

LM185BYH/883

LM285BXZ

TO-92

LM285BYZ

LM285Z

LM285M

LM285BYM

LM185BE/883

LM385BXZ

LM385BYZ

LM385BZ

LM385Z

8-Pin SOIC

20-Leadless Chip

Carrier

LM385M

LM385BM

M08A

E20A

Z03A

H03H

Temperature Range

−40˚C to 85˚C

0˚C to 70˚C

NSC

Drawing

Block Diagram

00525013

Typical Applications

1.2V Reference

5.0V Reference

00525014

00525002

www.national.com

LM185/LM285/LM385

Absolute Maximum Ratings

(Note 1)

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

−55˚C to 125˚C

−40˚C to 85˚C

0˚C to 70˚C

30mA

10mA

Storage Temperature

Soldering Information

TO-92 Package (10 sec.)

TO-46 Package (10 sec.)

SO Package

Vapor Phase (60 sec.)

Infrared (15 sec.)

−55˚C to 150˚C

260˚C

300˚C

215˚C

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)

LM185, LM285

LM185BX,

LM185BY

LM185B,

LM285BX,

Typ

LM285BY

Tested Design Tested Design

Limit

(Note

Reference

Voltage

= 100µA

1.240 1.252

1.255

1.228

1.215

Reference

Voltage

Change with

Current

Impedance

MIN

1mA

20mA

0.2

1.5

0.2

1.5

1.215

1.205

1.228

1.215

1.205

Limit

(Note

Limit

(Note

1.265

Limit

(Note

LM285

Typ

Tested Design Tested Design

Limit

(Note

Limit

(Note

1.255

Limit

(Note

1.265

Limit

(Note

1.270

(max)

(min)

(max)

LM385

LM385BX,

LM385BY

LM385

Units

(Limit)

Parameter

Conditions

1.270

1.240 1.252

Dynamic Output I

= 100µA, f = 100Hz

= 0.1 I

OUT

REF

OUT

5.3V

Reference

Voltage

Change with

Output

Voltage

Feedback

Current

Minimum

Operating

Current (see

curve)

Output

Wideband

Noise

OUT

= V

REF

OUT

= 5.3V

= 100µA, 10Hz

10kHz

OUT

= V

REF

OUT

= 5.3V

170

µV

rms

(max)

µA

(max)

= 100µA

0.3

0.7

0.4

Ω

(max)

www.national.com

LM185/LM285/LM385

Electrical Characteristics

(Note 4)

(Continued)

LM185, LM285

LM385

LM385BX,

LM285

Typ

Tested Design Tested Design

Limit

(Note

150

ppm

Limit

(Note

Limit

(Note

Limit

(Note

ppm/˚c

(max)

Limit

(Note

Limit

(Note

LM385BY

LM385

Units

(Limit)

LM185BX,

LM185BY

LM185B,

LM285BX,

Typ

LM285BY

Tested Design Tested Design

Limit

(Note

Average

Temperature

Coefficient

(Note 7)

Long Term

Stability

= 100µA

X Suffix

Y Suffix

All Others

= 100µA, T = 1000

Hr,

= 25˚C

0.1˚C

Limit

(Note

Parameter

Conditions

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

max is:

LM185

LM285

LM385

Thermal Resistance

(Junction to Ambient)

(Junction to Case)

150˚C

125˚C

100˚C

TO-92

TO-46

SO-8

180˚C/W (0.4" leads)

170˚C/W (0.125" leads)

N/A

440˚C/W 165˚C/W

80˚C/W

N/A

Note 4:

Parameters identified with

boldface type

apply at temperature extremes. All other numbers apply at T

= T

= 25˚C. Unless otherwise specified, all

parameters apply for V

REF

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

− T

MIN

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

www.national.com

LM185/LM285/LM385

Typical Performance Characteristics

Temperature Drift of 3

Representative Units

Feedback Current

00525016

00525017

Minimum Operating Current

Reverse Characteristics

00525018

00525019

Reverse Characteristics

Forward Characteristics

00525020

00525021

www.national.com

参数对比

与LM385BYZ相近的元器件有：LM285BYM、LM285BYZ、LM385BM、LM385BZ、LM385M、LM385Z、LM185BE/883、LM185BH/883、LM185BYH。描述及对比如下：

型号	LM385BYZ	LM285BYM	LM285BYZ	LM385BM	LM385BZ	LM385M	LM385Z	LM185BE/883	LM185BH/883	LM185BYH
描述	1-OUTPUT TWO TERM VOLTAGE REFERENCE, 1.24 V, PDSO8	1-OUTPUT TWO TERM VOLTAGE REFERENCE, 1.24 V, PDSO8	1-OUTPUT TWO TERM VOLTAGE REFERENCE, 1.24 V, PDSO8	1-OUTPUT TWO TERM VOLTAGE REFERENCE, 1.24 V, PDSO8	1-OUTPUT TWO TERM VOLTAGE REFERENCE, 1.24 V, PDSO8	1-OUTPUT TWO TERM VOLTAGE REFERENCE, 1.24 V, PDSO8	1-OUTPUT TWO TERM VOLTAGE REFERENCE, 1.24 V, PBCY3	1-OUTPUT TWO TERM VOLTAGE REFERENCE, 1.24 V, PDSO8	1-OUTPUT TWO TERM VOLTAGE REFERENCE, 1.24 V	1-OUTPUT TWO TERM VOLTAGE REFERENCE, 1.24 V, PDSO8
功能数量	1	1	1	1	1	1	1	1	1	1
最大输出电压	1.252 V	1.252 V	1.25 V	1.265 V	1.265 V	1.265 V	1.265 V	1.252 V	1.25 V	1.25 V
最小输出电压	1.228 V	1.228 V	1.23 V	1.215 V	1.215 V	1.215 V	1.215 V	1.228 V	1.23 V	1.23 V
最大电压温度系数	50 ppm/°C	50 ppm/°C	50 ppm/Cel	150 ppm/°C	150 ppm/°C	150 ppm/°C	150 ppm/°C	150 ppm/°C	150 ppm/Cel	50 ppm/Cel
温度等级	COMMERCIAL	INDUSTRIAL	INDUSTRIAL	COMMERCIAL	COMMERCIAL	COMMERCIAL	COMMERCIAL	MILITARY	MILITARY	INDUSTRIAL
是否Rohs认证	不符合	不符合	-	不符合	不符合	不符合	不符合	不符合	-	-
包装说明	TO-92, SIP3,.1,50	SOIC-8	-	SOIC-8	TO-92, SIP3,.1,50	SOIC-8	PLASTIC, TO-92, 3 PIN	QCCN, LCC20,.35SQ	-	-
Reach Compliance Code	_compli	_compli	-	_compli	_compli	_compli	_compli	compli	-	-
ECCN代码	EAR99	EAR99	-	EAR99	EAR99	EAR99	EAR99	EAR99	-	-
其他特性	ADJUSTABLE FROM 1.24V TO 5.30V	ADJUSTABLE FROM 1.24V TO 5.30V	-	ADJUSTABLE FROM 1.24V TO 5.30V	ADJUSTABLE FROM 1.24V TO 5.30V	ADJUSTABLE FROM 1.24V TO 5.30V	ADJUSTABLE FROM 1.24V TO 5.30V	ADJUSTABLE FROM 1.24V TO 5.30V	-	-
模拟集成电路 - 其他类型	TWO TERMINAL VOLTAGE REFERENCE	TWO TERMINAL VOLTAGE REFERENCE	-	TWO TERMINAL VOLTAGE REFERENCE	TWO TERMINAL VOLTAGE REFERENCE	TWO TERMINAL VOLTAGE REFERENCE	TWO TERMINAL VOLTAGE REFERENCE	TWO TERMINAL VOLTAGE REFERENCE	-	-
JESD-30 代码	O-PBCY-W3	R-PDSO-G8	-	R-PDSO-G8	O-PBCY-W3	R-PDSO-G8	O-PBCY-W3	S-CQCC-N20	-	-
JESD-609代码	e0	e0	-	e0	e0	e0	e0	-	-	-
湿度敏感等级	1	1	-	1	1	1	1	1	-	-
输出次数	1	1	-	1	1	1	1	1	-	-
端子数量	3	8	8	8	3	8	3	20	-	8
最高工作温度	70 °C	85 °C	-	70 °C	70 °C	70 °C	70 °C	125 °C	-	-
标称输出电压	1.24 V	1.24 V	-	1.24 V	1.24 V	1.24 V	1.24 V	1.24 V	-	-
封装主体材料	PLASTIC/EPOXY	PLASTIC/EPOXY	-	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY	CERAMIC, METAL-SEALED COFIRED	-	-
封装代码	TO-92	SOP	-	SOP	TO-92	SOP	TO-92	QCCN	-	-
封装等效代码	SIP3,.1,50	SOP8,.25	-	SOP8,.25	SIP3,.1,50	SOP8,.25	SIP3,.1,50	LCC20,.35SQ	-	-
封装形状	ROUND	RECTANGULAR	-	RECTANGULAR	ROUND	RECTANGULAR	ROUND	SQUARE	-	-
封装形式	CYLINDRICAL	SMALL OUTLINE	-	SMALL OUTLINE	CYLINDRICAL	SMALL OUTLINE	CYLINDRICAL	CHIP CARRIER	-	-
峰值回流温度（摄氏度）	260	235	-	235	260	235	260	225	-	-
认证状态	Not Qualified	Not Qualified	-	Not Qualified	Not Qualified	Not Qualified	Not Qualified	Not Qualified	-	-
最大供电电流 (Isup)	0.055 mA	0.045 mA	-	0.055 mA	0.055 mA	0.055 mA	0.055 mA	-	-	-
最大供电电压 (Vsup)	5.3 V	5.3 V	-	5.3 V	5.3 V	5.3 V	5.3 V	5.3 V	-	-
最小供电电压 (Vsup)	1.24 V	1.24 V	-	1.24 V	1.24 V	1.24 V	1.24 V	1.24 V	-	-
表面贴装	NO	YES	YES	YES	NO	YES	NO	YES	-	YES
技术	BIPOLAR	BIPOLAR	-	BIPOLAR	BIPOLAR	BIPOLAR	BIPOLAR	BIPOLAR	-	-
端子面层	Tin/Lead (Sn85Pb15)	Tin/Lead (Sn/Pb)	-	Tin/Lead (Sn/Pb)	Tin/Lead (Sn85Pb15)	Tin/Lead (Sn/Pb)	Tin/Lead (Sn/Pb)	-	-	-
端子形式	WIRE	GULL WING	GULL WING	GULL WING	WIRE	GULL WING	WIRE	NO LEAD	-	GULL WING
端子节距	1.27 mm	1.27 mm	-	1.27 mm	1.27 mm	1.27 mm	1.27 mm	1.27 mm	-	-
端子位置	BOTTOM	DUAL	DUAL	DUAL	BOTTOM	DUAL	BOTTOM	QUAD	-	DUAL
处于峰值回流温度下的最长时间	40	30	-	30	40	30	40	NOT SPECIFIED	-	-
微调/可调输出	YES	YES	-	YES	YES	YES	YES	YES	-	-