NSC LM285BYZ Adjustable micropower voltage reference Datasheet

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 exceptionally low 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 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. 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
■
■
■
■
■
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
525009
Bottom View
525001
Bottom View
SOIC Package
20-Leadless Chip Carrier
525010
Top View
525015
Top View
© 2008 National Semiconductor Corporation
5250
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LM185/LM285/LM385 Adjustable Micropower Voltage Reference
January 30, 2008
LM185/LM285/LM385
Ordering Information
Package
Temperature Range
−55°C to 125°C
−40°C to 85°C
NSC
Drawing
0°C to 70°C
LM185BH
LM185BH/883
TO-46
H03H
LM185BYH
LM185BYH/883
TO-92
LM285BXZ
LM385BXZ
LM285BYZ
LM385BYZ
LM285Z
LM385BZ
LM285M
LM385M
LM285BYM
LM385BM
Z03A
LM385Z
8-Pin SOIC
20-Leadless Chip
Carrier
LM185BE/883
E20A
Block Diagram
525013
Typical Applications
1.2V Reference
5.0V Reference
525014
525002
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M08A
2
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
Electrical Characteristics
30mA
10mA
−55°C to 125°C
−40°C to 85°C
0°C to 70°C
(Note 4)
LM185, LM285
Parameter
Conditions
Typ
LM385
LM185BX,
LM185BY
LM185B,
LM285BX,
LM285BY
LM385BX,
LM285
IR = 100μA
Reference
Voltage
Change with
Current
IMIN< IR < 1mA
Dynamic
Output
Impedance
IR = 100μA,
1.240
1mA < IR < 20mA
IAC = 0.1 IR
f=
100Hz
VOUT =
VREF
VOUT =
5.3V
Reference
Voltage
Change with
Output
Voltage
1.252
1.265
1.270
1.255
1.228
1.215
1.215
1.205
Tested Design Tested Design
Limit
Limit
Limit
Limit
(Note (Note (Note (Note
5)
6)
5)
6)
1.240
1.252
1.255
1.265
1.270
V
1.228
1.215
1.215
1.205
(max)
V
(min)
0.2
1
1.5
1
1.5
0.2
1
1.5
1
1.5
mV
4
10
20
10
20
5
15
25
15
25
(max)
0.3
0.4
0.7
1
Ω
IR = 100μA
Feedback
Current
Units
(Limit)
Typ
Tested Design Tested Design
Limit
Limit
Limit
Limit
(Note (Note (Note (Note
5)
6)
5)
6)
Reference
Voltage
LM385
LM385BY
mV
1
3
6
3
6
2
5
10
5
10
13
20
25
20
25
16
30
35
30
35
nA
(max)
(max)
Minimum
Operating
Current (see
curve)
VOUT = VREF
6
9
10
9
10
7
11
13
11
13
μA
VOUT = 5.3V
30
45
50
45
50
35
55
60
55
60
(max)
Output
Wideband
IR = 100μA, 10Hz < f <
10kHz
VOUT = VREF
50
50
VOUT = 5.3V
170
170
Noise
3
μVrms
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LM185/LM285/LM385
ESD Susceptibility (Note 8)
2kV
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.
Absolute Maximum Ratings (Note 1)
LM185/LM285/LM385
LM185, LM285
Parameter
Conditions
LM185BX,
LM185BY
LM185B,
LM285BX,
LM285BY
Typ
LM385
LM385BX,
LM285
LM385BY
IR = 100μA
Long Term
Stability
Tested Design Tested Design
Limit
Limit
Limit
Limit
(Note (Note (Note (Note
5)
6)
5)
6)
X Suffix
30
30
Y Suffix
50
50
All
Others
IR = 100μA, T = 1000
Hr,
TA = 25°C ± 0.1°C
150
ppm/°
c
(max)
150
20
Units
(Limit)
Typ
Tested Design Tested Design
Limit
Limit
Limit
Limit
(Note (Note (Note (Note
5)
6)
5)
6)
Average
Temperature
Coefficient
(Note 7)
LM385
150
20
150
ppm
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
150°C
LM285
125°C
LM385
100°C
Thermal Resistance
θJA (Junction to Ambient)
TO-92
TO-46
SO-8
180°C/W (0.4″ leads)
440°C/W
165°C/W
80°C/W
N/A
170°C/W (0.125″ leads)
θJC (Junction to Case)
N/A
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.
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4
LM185/LM285/LM385
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
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LM185/LM285/LM385
Output Noise Voltage
Dynamic Output Impedance
525023
525022
Response Time
525024
Temperature Coefficient Typical
LM185
LM285
LM385
525004
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6
LM185/LM285/LM385
Typical Applications
Precision 10V Reference
Low AC Noise Reference
525025
525026
25V Low Current Shunt Regulator
200 mA Shunt Regulator
525027
525028
7
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LM185/LM285/LM385
Series-Shunt 20 mA Regulator
High Efficiency Low Power Regulator
525029
525030
Voltage Level Detector
Voltage Level Detector
525031
525032
Fast Positive Clamp
2.4V + ΔVD1
Bidirectional Clamp
±2.4V
525034
525033
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8
LM185/LM285/LM385
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
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LM185/LM285/LM385
*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
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10
LM185/LM285/LM385
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
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LM185/LM285/LM385
SO Package (M)
NS Package Number M08A
TO-92 Plastic Package (Z)
NS Package Number Z03A
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12
LM185/LM285/LM385
Notes
13
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LM185/LM285/LM385 Adjustable Micropower Voltage Reference
Notes
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