SLVS023I − JANUARY 1989 − REVISED FEBRUARY 2005
D Operating Current Range . . . 20 µA to
D
D
D
D
D
LM285-2.5 . . . D PACKAGE
LM385-2.5, LM385B-2.5 . . . D OR PW PACKAGE
(TOP VIEW)
20 mA
1.5% and 3% Initial Voltage Tolerance
Reference Impedance
− LM385 . . . 1 Ω Max at 25°C
− All Devices . . . 1.5 Ω Max Over Full
Temperature Range
Very Low Power Consumption
Applications
− Portable Meter References
− Portable Test Instruments
− Battery-Operated Systems
− Current-Loop Instrumentation
− Panel Meters
Interchangeable With Industry-Standard
LM285-2.5 and LM385-2.5
NC
NC
NC
ANODE
1
8
2
7
3
6
4
5
CATHODE
NC
NC
NC
NC − No internal connection
LM285-2.5, LM385-2.5, LM385B-2.5 . . . LP PACKAGE
(TOP VIEW)
ANODE
CATHODE
NC
NC − No internal connection
description/ordering information
These micropower two-terminal band-gap voltage references operate over a 20-µA to 20-mA current range and
feature exceptionally low dynamic impedance and good temperature stability. On-chip trimming provides tight
voltage tolerance. The band-gap reference for these devices has low noise and long-term stability.
ORDERING INFORMATION
TA
VZ
TOLERANCE
PACKAGE†
SOIC (D)
3%
TO226/TO-92 (LP)
TSSOP (PW)
0°C to 70°C
SOIC (D)
1.5%
TO226/TO-92 (LP)
TSSOP (PW)
SOIC (D)
−40°C to 85°C
1.5%
ORDERABLE
PART NUMBER
Tube of 75
LM385D-2-5
Reel of 2000
LM385DR-2-5
Tube of 1000
LM385LP-2-5
Reel of 2000
LM385LPR-2-5
Tube of 150
LM385PW-2-5
Reel of 2000
LM385PWR-2-5
Tube of 75
LM385BD-2-5
Reel of 2000
LM385BDR-2-5
Tube of 1000
LM385BLP-2-5
Reel of 2000
LM385BLPR-2-5
Tube of 150
LM385BPW-2-5
Reel of 2000
LM385BPWR-2-5
Tube of 75
LM285D-2-5
Reel of 2000
LM285DR-2-5
Tube of 1000
LM285LP-2-5
TOP-SIDE
MARKING
385-25
385-25
385-25
385B25
385-25
385B25
285-25
285-25
TO226/TO-92 (LP)
Reel of 2000
LM285LPR-2-5
285-25
† Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines are available at
www.ti.com/sc/package.
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
Copyright 2005, Texas Instruments Incorporated
!"# $ %&'# "$ (&)*%"# +"#'
+&%#$ %! # $('%%"#$ (' #,' #'!$ '-"$ $#&!'#$
$#"+"+ .""#/ +&%# (%'$$0 +'$ # '%'$$"*/ %*&+'
#'$#0 "** (""!'#'$
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1
SLVS023I − JANUARY 1989 − REVISED FEBRUARY 2005
description/ordering information (continued)
The design makes these devices exceptionally tolerant of capacitive loading and, thus, easier to use in most
reference applications. The wide dynamic operating temperature range accommodates varying current
supplies, with excellent regulation.
The extremely low power drain of this series makes them useful for micropower circuitry. These voltage
references can be used to make portable meters, regulators, or general-purpose analog circuitry, with battery
life approaching shelf life. The wide operating current range allows them to replace older references with
tighter-tolerance parts.
symbol
ANODE
CATHODE
schematic
CATHODE
Q13
600 kΩ
7.5 kΩ
Q12
Q4
Q7
200 kΩ
Q11
Q3
50 kΩ
Q10
Q1
20 pF
300 kΩ
20 pF
500 Ω
Q9
Q2
Q5
Q6
100 kΩ
500 Ω
Q8
Q14
500 Ω
60 kΩ
ANODE
NOTE A: All component values shown are nominal.
2
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SLVS023I − JANUARY 1989 − REVISED FEBRUARY 2005
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)†
Reverse current, IR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 mA
Forward current, IF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 mA
Package thermal impedance, θJA (see Notes 1 and 2): D package . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97°C/W
LP package . . . . . . . . . . . . . . . . . . . . . . . . . . 140°C/W
PW package . . . . . . . . . . . . . . . . . . . . . . . . . 149°C/W
Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 260°C
Storage temperature range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −65°C to 150°C
† Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and
functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not
implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
NOTES: 1. Maximum power dissipation is a function of TJ(max), θJA, and TA. The maximum allowable power dissipation at any allowable ambient
temperature is PD = (TJ(max) − TA)/θJA. Operation at the absolute maximum TJ of 150°C can affect reliability.
2. The package thermal impedance is calculated in accordance with JESD 51-7.
recommended operating conditions
IZ
Reference current
TA
Operating free-air temperature range
LM285-2.5
LM385-2.5, LM385B-2.5
MIN
MAX
0.02
20
−40
85
0
70
UNIT
mA
°C
electrical characteristics at specified free-air temperature
PARAMETER
LM285-2.5
LM385-2.5
LM385B-2.5
TEST
CONDITIONS
TA‡
MIN
TYP
MAX
MIN
TYP
MAX
MIN
TYP
MAX
2.462
2.5
2.538
2.425
2.5
2.575
2.462
2.5
2.538
VZ
Reference
voltage
IZ = 20 µA
to 20 mA
25°C
αVZ
Average
temperature
coefficient of
reference
voltage§
IZ = 20 µA
to 20 mA
Full range
∆VZ
Change in
reference
voltage with
current
IZ = 20 µA
to 1 mA
IZ = 1 µA
to 20 mA
∆VZ/∆t
Long-term
change in
reference
voltage
IZ(min)
Minimum
reference
current
zz
Reference
impedance
A
IZ = 100 µA
Vn
Broadband
noise
voltage
IZ = 100 µA,
f = 10 Hz
to 10 kHz
IZ = 100 µA
±20
25°C
±20
1
±20
2
2
1.5
2
2
25°C
10
20
20
Full range
30
30
30
Full range
25°C
±20
8
20
8
0.2
0.6
0.4
Full range
25°C
±20
1.5
120
±20
20
8
1
0.4
1.5
120
V
ppm/°C
Full range
25°C
UNIT
ppm/khr
20
1
1.5
120
mV
µA
Ω
µV
‡ Full range is 0°C to 70°C for the LM385-2.5 and LM385B-2.5, and −40°C to 85°C for the LM285-2.5.
§ The average temperature coefficient of reference voltage is defined as the total change in reference voltage divided by the specified temperature
range.
POST OFFICE BOX 655303
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3
SLVS023I − JANUARY 1989 − REVISED FEBRUARY 2005
TYPICAL CHARACTERISTICS†
REVERSE CURRENT
vs
REVERSE VOLTAGE
REFERENCE VOLTAGE CHANGE
vs
REVERSE CURRENT
100
16
TA = −55°C to 125°C
∆V Z − Reference Voltage Change − mV
I R − Reverse Current − µA
TA = −55°C to 125°C
10
1
0.1
0
0.5
1
2.5
2
1.5
12
8
4
0
−4
0.01
3
VR − Reverse Voltage − V
0.1
1
Figure 1
REFERENCE VOLTAGE
vs
FREE-AIR TEMPERATURE
2.525
1.6
IZ = 20 µA to 20 mA
TA = 25°C
1.4
2.52
1.2
2.515
VZ − Reference Voltage − V
V F − Forward Voltage − V
100
Figure 2
FORWARD VOLTAGE
vs
FORWARD CURRENT
1
0.8
0.6
0.4
2.51
2.505
2.5
2.495
2.49
0.2
0
0.01
10
IR − Reverse Current − mA
2.485
0.1
1
10
100
2.48
− 55 − 35 − 15
5
25
45
65
85
105 125
TA − Free-Air Temperature − °C
IF − Forward Current − mA
Figure 3
Figure 4
† Data at high and low temperatures are applicable only within the rated operating free-air temperature ranges of the various devices.
4
POST OFFICE BOX 655303
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SLVS023I − JANUARY 1989 − REVISED FEBRUARY 2005
TYPICAL CHARACTERISTICS†
REFERENCE IMPEDANCE
vs
FREQUENCY
REFERENCE IMPEDANCE
vs
REFERENCE CURRENT
1000
10 k
IZ = 100 µA
TA = 25°C
z z − Reference Impedance − Ω
z z − Reference Impedance − Ω
f = 25 Hz
TA = MIN to MAX‡
100
10
1
0.1
0.01
0.1
1
10
1k
100
10
1
0.1
0.01
100
0.1
1
Iz − Reference Current − mA
NOISE VOLTAGE
vs
FREQUENCY
TA = 25°C
100 µA
Filtered RMS Output Noise Voltage − µV
Vn − Noise Voltage − nV/ Hz
120
IZ = 100 µA
TA = 25°C
1000
800
600
400
200
100
1000
FILTERED RMS OUTPUT NOISE VOLTAGE
vs
FREQUENCY
1400
0
10
100
Figure 6
Figure 5
1200
10
f − Frequency − kHz
1k
10 k
100 k
RC Low Pass
100
R
C
80
60
40
20
0
0.1
f − Frequency − Hz
1
10
100
f − Frequency − kHz
Figure 7
Figure 8
† Data at high and low temperatures are applicable only within the rated operating free-air temperature ranges of the various devices.
‡ For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions.
POST OFFICE BOX 655303
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5
SLVS023I − JANUARY 1989 − REVISED FEBRUARY 2005
TYPICAL CHARACTERISTICS†
TRANSIENT RESPONSE
Input and Output Voltage − V
4
ÎÎÎ
ÎÎÎ
3
Output
24 kΩ
2
VI
VO
1
0
5
ÎÎ
ÎÎ
Input
0
0
100
t − Time − µs
500
600
Figure 9
† Data at high and low temperatures are applicable only within the rated operating free-air temperature ranges of the various devices.
6
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
SLVS023I − JANUARY 1989 − REVISED FEBRUARY 2005
APPLICATION INFORMATION
IO ≈ 60 µA
+
Two Mercury
Cells
2.6 V −
V+
3.3 kΩ
200 kΩ ±1%
LM334
cw
2.00 kΩ ±1%
cw
V−
20 kΩ
500 Ω
412 Ω†
±1%
953 Ω
±1%
LM385-2.5
R
+
Type K
−
Meter
† Adjust for 12.17 mV at 25°C across 412 Ω
Figure 10. Thermocouple Cold-Junction Compensator
3.7 V ≤ V+ ≤ 30 V
V+
LM334
R
V−
2.74 kΩ
2.5 V
LM385-2.5
Figure 11. Operation Over a Wide Supply Range
9V
221 kΩ
2.5 V
LM385-2.5
Figure 12. Reference From a 9-V Battery
POST OFFICE BOX 655303
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7
PACKAGE OPTION ADDENDUM
www.ti.com
17-Feb-2005
PACKAGING INFORMATION
Orderable Device
Status (1)
Package
Type
Package
Drawing
Pins Package Eco Plan (2)
Qty
LM285D-2-5
ACTIVE
SOIC
D
8
75
Pb-Free
(RoHS)
CU NIPDAU
Level-2-250C-1 YEAR
LM285DR-2-5
ACTIVE
SOIC
D
8
2500
Pb-Free
(RoHS)
CU NIPDAU
Level-2-250C-1 YEAR
LM285LP-2-5
ACTIVE
TO-92
LP
3
1000
None
Call TI
Level-NC-NC-NC
LM285LPR-2-5
ACTIVE
TO-92
LP
3
2000
None
Call TI
Level-NC-NC-NC
LM385BD-2-5
ACTIVE
SOIC
D
8
75
Pb-Free
(RoHS)
CU NIPDAU
Level-2-250C-1 YEAR
LM385BDR-2-5
ACTIVE
SOIC
D
8
2500
Pb-Free
(RoHS)
CU NIPDAU
Level-2-250C-1 YEAR
Lead/Ball Finish
MSL Peak Temp (3)
LM385BLP-2-5
ACTIVE
TO-92
LP
3
1000
None
Call TI
Level-NC-NC-NC
LM385BLPR-2-5
ACTIVE
TO-92
LP
3
2000
None
Call TI
Level-NC-NC-NC
LM385BPW-2-5
ACTIVE
TSSOP
PW
8
150
Pb-Free
(RoHS)
CU NIPDAU
Level-1-250C-UNLIM
LM385BPWR-2-5
ACTIVE
TSSOP
PW
8
2000
Pb-Free
(RoHS)
CU NIPDAU
Level-1-250C-UNLIM
LM385D-2-5
ACTIVE
SOIC
D
8
75
Pb-Free
(RoHS)
CU NIPDAU
Level-2-250C-1 YEAR
LM385DR-2-5
ACTIVE
SOIC
D
8
2500
Pb-Free
(RoHS)
CU NIPDAU
Level-2-250C-1 YEAR
LM385LP-2-5
ACTIVE
TO-92
LP
3
1000
None
Call TI
Level-NC-NC-NC
LM385LPR-2-5
ACTIVE
TO-92
LP
3
2000
None
Call TI
Level-NC-NC-NC
LM385PW-2-5
ACTIVE
TSSOP
PW
8
150
Pb-Free
(RoHS)
CU NIPDAU
Level-1-250C-UNLIM
LM385PWR-2-5
ACTIVE
TSSOP
PW
8
2000
Pb-Free
(RoHS)
CU NIPDAU
Level-1-250C-UNLIM
(1)
The marketing status values are defined as follows:
ACTIVE: Product device recommended for new designs.
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in
a new design.
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.
OBSOLETE: TI has discontinued the production of the device.
(2)
Eco Plan - May not be currently available - please check http://www.ti.com/productcontent for the latest availability information and additional
product content details.
None: Not yet available Lead (Pb-Free).
Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements
for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered
at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes.
Green (RoHS & no Sb/Br): TI defines "Green" to mean "Pb-Free" and in addition, uses package materials that do not contain halogens,
including bromine (Br) or antimony (Sb) above 0.1% of total product weight.
(3)
MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDECindustry standard classifications, and peak solder
temperature.
Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is
provided. TI bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the
accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and continues to take
reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on
incoming materials and chemicals. TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited
Addendum-Page 1
PACKAGE OPTION ADDENDUM
www.ti.com
17-Feb-2005
information may not be available for release.
In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI
to Customer on an annual basis.
Addendum-Page 2
MECHANICAL DATA
MSOT002A – OCTOBER 1994 – REVISED NOVEMBER 2001
LP (O-PBCY-W3)
PLASTIC CYLINDRICAL PACKAGE
0.205 (5,21)
0.175 (4,44)
0.165 (4,19)
0.125 (3,17)
DIA
0.210 (5,34)
0.170 (4,32)
Seating
Plane
0.157 (4,00) MAX
0.050 (1,27)
C
0.500 (12,70) MIN
0.104 (2,65)
FORMED LEAD OPTION
0.022 (0,56)
0.016 (0,41)
0.016 (0,41)
0.014 (0,35)
STRAIGHT LEAD OPTION
D
0.135 (3,43) MIN
0.105 (2,67)
0.095 (2,41)
0.055 (1,40)
0.045 (1,14)
1
2
3
0.105 (2,67)
0.080 (2,03)
0.105 (2,67)
0.080 (2,03)
4040001-2 /C 10/01
NOTES: A. All linear dimensions are in inches (millimeters).
B. This drawing is subject to change without notice.
C. Lead dimensions are not controlled within this area
D. FAlls within JEDEC TO -226 Variation AA (TO-226 replaces TO-92)
E. Shipping Method:
Straight lead option available in bulk pack only.
Formed lead option available in tape & reel or ammo pack.
POST OFFICE BOX 655303
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1
MECHANICAL DATA
MSOT002A – OCTOBER 1994 – REVISED NOVEMBER 2001
LP (O-PBCY-W3)
PLASTIC CYLINDRICAL PACKAGE
0.539 (13,70)
0.460 (11,70)
1.260 (32,00)
0.905 (23,00)
0.650 (16,50)
0.610 (15,50)
0.020 (0,50) MIN
0.098 (2,50)
0.384 (9,75)
0.335 (8,50)
0.748 (19,00)
0.217 (5,50)
0.433 (11,00)
0.335 (8,50)
0.748 (19,00)
0.689 (17,50)
0.114 (2,90)
0.094 (2,40)
0.114 (2,90)
0.094 (2,40)
0.169 (4,30)
0.146 (3,70)
DIA
0.266 (6,75)
0.234 (5,95)
0.512 (13,00)
0.488 (12,40)
TAPE & REEL
4040001-3 /C 10/01
NOTES: A. All linear dimensions are in inches (millimeters).
B. This drawing is subject to change without notice.
C. Tape and Reel information for the Format Lead Option package.
2
POST OFFICE BOX 655303
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MECHANICAL DATA
MTSS001C – JANUARY 1995 – REVISED FEBRUARY 1999
PW (R-PDSO-G**)
PLASTIC SMALL-OUTLINE PACKAGE
14 PINS SHOWN
0,30
0,19
0,65
14
0,10 M
8
0,15 NOM
4,50
4,30
6,60
6,20
Gage Plane
0,25
1
7
0°– 8°
A
0,75
0,50
Seating Plane
0,15
0,05
1,20 MAX
PINS **
0,10
8
14
16
20
24
28
A MAX
3,10
5,10
5,10
6,60
7,90
9,80
A MIN
2,90
4,90
4,90
6,40
7,70
9,60
DIM
4040064/F 01/97
NOTES: A.
B.
C.
D.
All linear dimensions are in millimeters.
This drawing is subject to change without notice.
Body dimensions do not include mold flash or protrusion not to exceed 0,15.
Falls within JEDEC MO-153
POST OFFICE BOX 655303
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