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PDF LM285BXZ-2.5 Data sheet ( Hoja de datos )
| Número de pieza | LM285BXZ-2.5 | |
| Descripción | Micropower Voltage Reference Diode | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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December 1999
LM185-2.5/LM285-2.5/LM385-2.5
Micropower Voltage Reference Diode
General Description
The LM185-2.5/LM285-2.5/LM385-2.5 are micropower
2-terminal band-gap voltage regulator diodes. Operating
over a 20 µA to 20 mA current range, they feature exception-
ally low dynamic impedance and good temperature stability.
On-chip trimming is used to provide tight voltage tolerance.
Since the LM-185-2.5 band-gap reference uses only transis-
tors and resistors, low noise and good long term stability re-
sult.
Careful design of the LM185-2.5 has made the device ex-
ceptionally 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 LM185-2.5 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 ref-
erences with a tighter tolerance part. For applications requir-
ing 1.2V see LM185-1.2.
The LM185-2.5 is rated for operation over a −55˚C to 125˚C
temperature range while the LM285-2.5 is rated −40˚C to
85˚C and the LM385-2.5 0˚C to 70˚C. The LM185-2.5/
LM285-2.5 are available in a hermetic TO-46 package and
the LM285-2.5/LM385-2.5 are also available in a low-cost
TO-92 molded package, as well as S.O. and SOT-23. The
LM185-2.5 is also available in a hermetic leadless chip car-
rier package.
Features
n ±20 mV (±0.8%) max. initial tolerance (A grade)
n Operating current of 20 µA to 20 mA
n 0.6Ω dynamic impedance (A grade)
n Low temperature coefficient
n Low voltage reference — 2.5V
n 1.2V device and adjustable device also
available — LM185-1.2 series and LM185 series,
respectively
Connection Diagrams
TO-92
Plastic Package
SO Package
DS005519-8
Bottom View
Order Number LM285Z-2.5,
LM285BXZ-2.5, LM285BYZ-2.5
LM385Z-2.5, LM385AXZ-2.5
LM385AYZ-2.5, LM385BZ-2.5,
LM385BXZ-2.5 or LM385BYZ-2.5
See NS Package Number Z03A
SOT-23
DS005519-11
Order Number LM285M-2.5,
LM285BXM-2.5, LM285BYM-2.5
LM385M-2.5, LM385BM-2.5
LM385BXM-2.5 or LM385BYM-2.5
See NS Package Number M08A
DS005519-29
* Pin 3 is attached to the Die Attach Pad (DAP) and should be connected to Pin 2 or left floating.
Order Number LM385M3-2.5
See NS Package Number MA03B
© 1999 National Semiconductor Corporation DS005519
www.national.com
1 page  
Typical Performance Characteristics
Reverse Characteristics
Reverse Characteristics
Forward Characteristics
Temperature Drift
DS005519-15
Reverse Dynamic
Impedance
DS005519-16
Reverse Dynamic
Impedance
DS005519-17
Noise Voltage
DS005519-18
DS005519-19
Filtered Output Noise
Response Time
DS005519-20
Applications
DS005519-21
Wide Input Range Reference
DS005519-22
DS005519-23
Micropower Reference from 9V Battery
DS005519-12
LM385-2.5 Applications
5
DS005519-2
www.national.com
5 Page 
Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
TO-46 Metal Can Package (H)
Order Number LM185H-2.5, LM185H-2.5/883, LM185BXH-2.5, LM185BXH-2.5/883,
LM185BYH-2.5, LM185BYH-2.5/883, LM285H-2.5, or LM285BYH-2.5
NS Package Number H02A
11 www.national.com
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet LM285BXZ-2.5.PDF ] | |
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