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Linear Technology Electronic Components Datasheet

LM385BS8-2.5 Datasheet

Micropower Voltage Reference

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LM385BS8-2.5 pdf
LM285-2.5, LM385-2.5, LM385B-2.5
MICROPOWER VOLTAGE REFERENCES
D Operating Current Range . . . 20 µA to
20 mA
D 1.5% and 3% Initial Voltage Tolerance
D Reference Impedance
– LM385 . . . 1 Max at 25°C
– All Devices . . . 1.5 Max Over Full
Temperature Range
D Very Low Power Consumption
D Applications:
– Portable Meter References
– Portable Test Instruments
– Battery-Operated Systems
– Current-Loop Instrumentation
– Panel Meters
D Interchangeable With Industry-Standard
LM285-2.5 and LM385-2.5
SLVS023H – JANUARY 1989 – REVISED AUGUST 2003
LM285-2.5 . . . D PACKAGE
LM385-2.5, LM385B-2.5 . . . D OR PW PACKAGE
(TOP VIEW)
NC
NC
NC
ANODE
1
2
3
4
8 CATHODE
7 NC
6 NC
5 NC
NC – No internal connection
LM285-2.5, LM385-2.5, LM385B-2.5 . . . LP PACKAGE
(TOP VIEW)
ANODE
CATHODE
NC
description/ordering information
NC – No internal connection
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†
ORDERABLE
PART NUMBER
TOP-SIDE
MARKING
SOIC (D)
Tube of 75
Reel of 2000
LM385D-2-5
LM385DR-2-5
385-25
Tube of 1000 LM385LP-2-5
3% TO226 / TO-92 (LP)
Reel of 2000 LM385LPR-2-5
385-25
0°C to 70°C
TSSOP (PW)
SOIC (D)
Tube of 150
Reel of 2000
Tube of 75
Reel of 2000
LM385PW-2-5
LM385PWR-2-5
LM385BD-2-5
LM385BDR-2-5
385-25
385B25
1.5%
Tube of 1000
TO226 / TO-92 (LP)
Reel of 2000
LM385BLP-2-5
LM385BLPR-2-5
385-25
TSSOP (PW)
Tube of 150
Reel of 2000
LM385BPW-2-5
LM385BPWR-2-5
385B25
–40°C to 85°C
1.5%
SOIC (D)
TO226 / TO-92 (LP)
Tube of 75
Reel of 2000
Tube of 1000
Reel of 2000
LM285D-2-5
LM285DR-2-5
LM285LP-2-5
LM285LPR-2-5
285-25
285-25
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.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
POST OFFICE BOX 655303 DALLAS, TEXAS 75265
Copyright 2003, Texas Instruments Incorporated
1



Linear Technology Electronic Components Datasheet

LM385BS8-2.5 Datasheet

Micropower Voltage Reference

No Preview Available !

LM385BS8-2.5 pdf
LM285-2.5, LM385-2.5, LM385B-2.5
MICROPOWER VOLTAGE REFERENCES
SLVS023H – JANUARY 1989 – REVISED AUGUST 2003
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
Q1
Q2
7.5 k
600 k
Q12
Q4 Q7
Q3
Q11
20 pF
Q5
20 pF
Q6 Q8
Q13
200 k
50 k
Q10
300 k
Q9
Q14
500
100 k
500
60 k
NOTE A: All component values shown are nominal.
500
ANODE
2 POST OFFICE BOX 655303 DALLAS, TEXAS 75265



Linear Technology Electronic Components Datasheet

LM385BS8-2.5 Datasheet

Micropower Voltage Reference

No Preview Available !

LM385BS8-2.5 pdf
LM285-2.5, LM385-2.5, LM385B-2.5
MICROPOWER VOLTAGE REFERENCES
SLVS023H – JANUARY 1989 – REVISED AUGUST 2003
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 UNIT
0.02 20 mA
–40 85
°C
0 70
electrical characteristics at specified free-air temperature
PARAMETER
TEST
CONDITIONS
TA‡
LM285-2.5
MIN TYP MAX
LM385-2.5
MIN TYP MAX
LM385B-2.5
UNIT
MIN TYP MAX
VZ
Reference
voltage
IZ = 20 µA
to 20 mA
25°C 2.462 2.5 2.538 2.425 2.5 2.575 2.462 2.5 2.538 V
Average
αVZ
temperature
coefficient of
reference
IZ = 20 µA
to 20 mA
25°C
±20
±20
±20 ppm/°C
voltage§
Change in
IZ = 20 µA
25°C
122
VZ
reference
voltage with
current
to 1 mA
IZ = 1 µA
to 20 mA
Full range
25°C
Full range
1.5
10
30
2
20
30
2
mV
20
30
Long-term
VZ/t
change in
reference
IZ = 100 µA
25°C
±20
±20
±20 ppm/khr
voltage
Minimum
IZ(min) reference
current
Full range
8 20
8 20
8 20 µA
zz
Reference
impedance
IZ = 100 µA
25°C
Full range
0.2 0.6
1.5
0.4 1
1.5
0.4 1
1.5
Broadband IZ = 100 µA,
Vn noise
f = 10 Hz
25°C
120
120
120 µV
voltage
to 10 kHz
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 DALLAS, TEXAS 75265
3




Part Number LM385BS8-2.5
Description Micropower Voltage Reference
Maker Linear Technology
Total Page 12 Pages
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