LM185_08 [NSC]
Adjustable Micropower Voltage References; 可调微功耗电压基准
| 型号： | LM185_08 |
| 厂家： | 
National Semiconductor |
| 描述： | Adjustable Micropower Voltage References |
| 文件： | 总14页 (文件大小：721K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
January 30, 2008
LM185/LM285/LM385
Adjustable Micropower Voltage References
wide operating current allows it to replace older references
with a tighter tolerance part.
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.
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
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.
Adjustable from 1.24V to 5.30V
■
■
■
■
■
Operating current of 10μA to 20mA
1% and 2% initial tolerance
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
1Ω dynamic impedance
Low temperature coefficient
Connection Diagrams
TO-92
Plastic Package
TO-46
Metal Can Package
525009
Bottom V5i2e5w001
Bottom View
SOIC Package
20-Leadless Chip Carrier
525010
Top View
525015
Top View
© 2008 National Semiconductor Corporation
5250
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
LM185BH
LM185BH/883
LM185BYH
TO-46
H03H
Z03A
LM185BYH/883
LM285BXZ
LM285BYZ
LM285Z
LM385BXZ
LM385BYZ
LM385BZ
LM385Z
TO-92
LM285M
LM385M
8-Pin SOIC
M08A
E20A
LM285BYM
LM385BM
20-Leadless Chip
Carrier
LM185BE/883
Block Diagram
525013
Typical Applications
1.2V Reference
5.0V Reference
525014
525002
www.national.com
2
ESD Susceptibility (Note 8)
Storage Temperature
Soldering Information
TO-92 Package (10 sec.)
TO-46 Package (10 sec.)
SO Package
Vapor Phase (60 sec.)
Infrared (15 sec.)
See An-450 “Surface Mounting Methods and Their Effect
on Product Reliability” for other methods of soldering
surface mount devices.
2kV
Absolute Maximum Ratings (Note 1)
−55°C to 150°C
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
260°C
300°C
(Note 2)
Reverse Current
Forward Current
30mA
10mA
215°C
220°C
Operating Temperature Range (Note 3)
LM185 Series
LM285 Series
−55°C to 125°C
−40°C to 85°C
0°C to 70°C
LM385 Series
Electrical Characteristics (Note 4)
LM185, LM285
LM385
LM185BX,
LM185BY
LM185B,
LM285BX,
LM285BY
LM385BX,
LM285
LM385
LM385BY
Units
Parameter
Conditions
(Limit)
Typ
Typ
Tested Design Tested Design
Limit Limit Limit Limit
(Note (Note (Note (Note
Tested Design Tested Design
Limit Limit Limit Limit
(Note (Note (Note (Note
5) 6) 5) 6)
1.265 1.270 1.240 1.252 1.255 1.265 1.270
5)
6)
5)
6)
Reference
Voltage
1.240 1.252
V
IR = 100μA
1.255
1.228
1.215
(max)
V
1.215 1.205
1.228 1.215 1.215 1.205
(min)
mV
Reference
Voltage
IMIN< IR < 1mA
0.2
4
1
1.5
20
1
1.5
20
0.2
5
1
1.5
25
1
1.5
25
Change with 1mA < IR < 20mA
Current
10
10
15
15
(max)
Dynamic
Output
f =
100Hz
IR = 100μA,
Impedance
IAC = 0.1 IR
VOUT
VREF
VOUT
5.3V
=
0.3
0.7
0.4
1
Ω
=
Reference
Voltage
IR = 100μA
mV
Change with
Output
1
3
6
3
6
2
5
10
5
10
(max)
Voltage
Feedback
Current
13
6
20
9
25
10
50
20
9
25
10
50
16
7
30
11
55
35
13
60
30
11
55
35
13
60
nA
(max)
Minimum
Operating
VOUT = VREF
μA
Current (see VOUT = 5.3V
curve)
30
45
45
35
(max)
Output
Wideband
IR = 100μA, 10Hz < f <
10kHz
Noise
VOUT = VREF
50
50
μVrms
VOUT = 5.3V
170
170
3
www.national.com
LM185, LM285
LM385
LM385BX,
LM385BY
LM185BX,
LM185BY
LM185B,
LM285BX,
LM285BY
LM285
LM385
Units
Parameter
Conditions
(Limit)
Typ
Typ
Tested Design Tested Design
Limit Limit Limit Limit
(Note (Note (Note (Note
Tested Design Tested Design
Limit Limit Limit Limit
(Note (Note (Note (Note
5)
6)
5)
6)
5)
6)
5)
6)
Average
X Suffix
30
30
ppm/°
c
IR = 100μA
Temperature
Coefficient
(Note 7)
Y Suffix
50
50
(max)
All
150
150
150
150
Others
Long Term
Stability
20
20
ppm
IR = 100μA, T = 1000
Hr,
TA = 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, TJmax is:
LM185
LM285
LM385
150°C
125°C
100°C
Thermal Resistance
TO-92
180°C/W (0.4″ leads)
170°C/W (0.125″ leads)
N/A
TO-46
SO-8
440°C/W
165°C/W
θ
θ
JA (Junction to Ambient)
80°C/W
N/A
JC (Junction to Case)
Note 4: Parameters identified with boldface type apply at temperature extremes. All other numbers apply at TA = TJ = 25°C. Unless otherwise specified, all
parameters apply for VREF < VOUT < 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 TMIN to TMAX, divided
by TMAX − TMIN. The measured temperatures are −55, −40, 0, 25, 70, 85, 125°C.
Note 8: The human body model is a 100 pF capacitor discharged through a 1.5 kΩ resistor into each pin.
www.national.com
4
Typical Performance Characteristics
Temperature Drift of 3
Representative Units
Feedback Current
525017
525016
Minimum Operating Current
Reverse Characteristics
525018
525019
Reverse Characteristics
Forward Characteristics
525020
525021
5
www.national.com
Output Noise Voltage
Dynamic Output Impedance
525023
525022
Response Time
525024
Temperature Coefficient Typical
LM185
LM285
LM385
525004
www.national.com
6
Typical Applications
Precision 10V Reference
Low AC Noise Reference
525025
525026
25V Low Current Shunt Regulator
200 mA Shunt Regulator
525027
525028
7
www.national.com
Series-Shunt 20 mA Regulator
High Efficiency Low Power Regulator
525029
525030
Voltage Level Detector
Voltage Level Detector
525031
525032
Fast Positive Clamp
Bidirectional Clamp
±2.4V
2.4V + ΔVD1
525034
525033
www.national.com
8
Bidirectional Adjustable Clamp
±1.8V to ±2.4V
Bidirectional Adjustable Clamp
±2.4V to ±6V
525036
525035
Simple Floating Current Detector
Current Source
525038
525037
Precision Floating Current Detector
525039
9
www.national.com
*D1 can be any LED, VF=1.5V to 2.2V at 3 mA. D1 may act as an indicator. D1 will be on if ITHRESHOLD falls below the threshold current, except with I=O.
Centigrade Thermometer, 10mV/°C
Freezer Alarm
525012
525011
Schematic Diagram
525008
www.national.com
10
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
SO Package (M)
NS Package Number M08A
TO-92 Plastic Package (Z)
NS Package Number Z03A
www.national.com
12
Notes
13
www.national.com
Notes
For more National Semiconductor product information and proven design tools, visit the following Web sites at:
Products
www.national.com/amplifiers
Design Support
Amplifiers
WEBENCH
www.national.com/webench
www.national.com/AU
Audio
www.national.com/audio
www.national.com/timing
www.national.com/adc
Analog University
App Notes
Clock Conditioners
Data Converters
Displays
www.national.com/appnotes
www.national.com/contacts
www.national.com/quality/green
www.national.com/packaging
Distributors
www.national.com/displays
www.national.com/ethernet
www.national.com/interface
www.national.com/lvds
Green Compliance
Packaging
Ethernet
Interface
Quality and Reliability www.national.com/quality
LVDS
Reference Designs
Feedback
www.national.com/refdesigns
www.national.com/feedback
Power Management
Switching Regulators
LDOs
www.national.com/power
www.national.com/switchers
www.national.com/ldo
LED Lighting
PowerWise
www.national.com/led
www.national.com/powerwise
Serial Digital Interface (SDI) www.national.com/sdi
Temperature Sensors
Wireless (PLL/VCO)
www.national.com/tempsensors
www.national.com/wireless
THE CONTENTS OF THIS DOCUMENT ARE PROVIDED IN CONNECTION WITH NATIONAL SEMICONDUCTOR CORPORATION
(“NATIONAL”) PRODUCTS. NATIONAL MAKES NO REPRESENTATIONS OR WARRANTIES WITH RESPECT TO THE ACCURACY
OR COMPLETENESS OF THE CONTENTS OF THIS PUBLICATION AND RESERVES THE RIGHT TO MAKE CHANGES TO
SPECIFICATIONS AND PRODUCT DESCRIPTIONS AT ANY TIME WITHOUT NOTICE. NO LICENSE, WHETHER EXPRESS,
IMPLIED, ARISING BY ESTOPPEL OR OTHERWISE, TO ANY INTELLECTUAL PROPERTY RIGHTS IS GRANTED BY THIS
DOCUMENT.
TESTING AND OTHER QUALITY CONTROLS ARE USED TO THE EXTENT NATIONAL DEEMS NECESSARY TO SUPPORT
NATIONAL’S PRODUCT WARRANTY. EXCEPT WHERE MANDATED BY GOVERNMENT REQUIREMENTS, TESTING OF ALL
PARAMETERS OF EACH PRODUCT IS NOT NECESSARILY PERFORMED. NATIONAL ASSUMES NO LIABILITY FOR
APPLICATIONS ASSISTANCE OR BUYER PRODUCT DESIGN. BUYERS ARE RESPONSIBLE FOR THEIR PRODUCTS AND
APPLICATIONS USING NATIONAL COMPONENTS. PRIOR TO USING OR DISTRIBUTING ANY PRODUCTS THAT INCLUDE
NATIONAL COMPONENTS, BUYERS SHOULD PROVIDE ADEQUATE DESIGN, TESTING AND OPERATING SAFEGUARDS.
EXCEPT AS PROVIDED IN NATIONAL’S TERMS AND CONDITIONS OF SALE FOR SUCH PRODUCTS, NATIONAL ASSUMES NO
LIABILITY WHATSOEVER, AND NATIONAL DISCLAIMS ANY EXPRESS OR IMPLIED WARRANTY RELATING TO THE SALE
AND/OR USE OF NATIONAL PRODUCTS INCLUDING LIABILITY OR WARRANTIES RELATING TO FITNESS FOR A PARTICULAR
PURPOSE, MERCHANTABILITY, OR INFRINGEMENT OF ANY PATENT, COPYRIGHT OR OTHER INTELLECTUAL PROPERTY
RIGHT.
LIFE SUPPORT POLICY
NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR
SYSTEMS WITHOUT THE EXPRESS PRIOR WRITTEN APPROVAL OF THE CHIEF EXECUTIVE OFFICER AND GENERAL
COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein:
Life support devices or systems are devices 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. A critical component is any component in 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 and the National Semiconductor logo are registered trademarks of National Semiconductor Corporation. All other
brand or product names may be trademarks or registered trademarks of their respective holders.
Copyright© 2008 National Semiconductor Corporation
For the most current product information visit us at www.national.com
National Semiconductor
Americas Technical
Support Center
Email:
new.feedback@nsc.com
Tel: 1-800-272-9959
National Semiconductor Europe
Technical Support Center
Email: europe.support@nsc.com
German Tel: +49 (0) 180 5010 771
English Tel: +44 (0) 870 850 4288
National Semiconductor Asia
Pacific Technical Support Center
Email: ap.support@nsc.com
National Semiconductor Japan
Technical Support Center
Email: jpn.feedback@nsc.com
www.national.com
相关型号：
©2020 ICPDF网 联系我们和版权申明