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PDF LM236AM-2.5 Data sheet ( Hoja de datos )
| Número de pieza | LM236AM-2.5 | |
| Descripción | Reference Diode | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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May 1998
LM136-2.5/LM236-2.5/LM336-2.5V
Reference Diode
General Description
The LM136-2.5/LM236-2.5 and LM336-2.5 integrated cir-
cuits are precision 2.5V shunt regulator diodes. These
monolithic IC voltage references operate as a
low-temperature-coefficient 2.5V zener with 0.2Ω dynamic
impedance. A third terminal on the LM136-2.5 allows the ref-
erence voltage and temperature coefficient to be trimmed
easily.
The LM136-2.5 series is useful as a precision 2.5V low volt-
age reference for digital voltmeters, power supplies or op
amp circuitry. The 2.5V make it convenient to obtain a stable
reference from 5V logic supplies. Further, since the
LM136-2.5 operates as a shunt regulator, it can be used as
either a positive or negative voltage reference.
The LM136-2.5 is rated for operation over −55˚C to +125˚C
while the LM236-2.5 is rated over a −25˚C to +85˚C tem-
perature range.
The LM336-2.5 is rated for operation over a 0˚C to +70˚C
temperature range. See the connection diagrams for avail-
able packages.
Features
n Low temperature coefficient
n Wide operating current of 400 µA to 10 mA
n 0.2Ω dynamic impedance
n ±1% initial tolerance available
n Guaranteed temperature stability
n Easily trimmed for minimum temperature drift
n Fast turn-on
n Three lead transistor package
Connection Diagrams
TO-92
Plastic Package
TO-46
Metal Can Package
DS005715-8
Bottom View
Order Number LM236Z-2.5,
LM236AZ-2.5, LM336Z-2.5 or LM336BZ-2.5
See NS Package Number Z03A
DS005715-20
Bottom View
Order Number LM136H-2.5,
LM136H-2.5/883, LM236H-2.5,
LM136AH-2.5, LM136AH-2.5/883
or LM236AH-2.5
See NS Package Number H03H
© 1999 National Semiconductor Corporation DS005715
www.national.com
1 page  
Application Hints
The LM136 series voltage references are much easier to use
than ordinary zener diodes. Their low impedance and wide
operating current range simplify biasing in almost any circuit.
Further, either the breakdown voltage or the temperature co-
efficient can be adjusted to optimize circuit performance.
Figure 1 shows an LM136 with a 10k potentiometer for ad-
justing the reverse breakdown voltage. With the addition of
R1 the breakdown voltage can be adjusted without affecting
the temperature coefficient of the device. The adjustment
range is usually sufficient to adjust for both the initial device
tolerance and inaccuracies in buffer circuitry.
If minimum temperature coefficient is desired, two diodes
can be added in series with the adjustment potentiometer as
shown in Figure 2. When the device is adjusted to 2.490V
the temperature coefficient is minimized. Almost any silicon
signal diode can be used for this purpose such as a 1N914,
1N4148 or a 1N457. For proper temperature compensation
the diodes should be in the same thermal environment as
the LM136. It is usually sufficient to mount the diodes near
the LM136 on the printed circuit board. The absolute resis-
tance of R1 is not critical and any value from 2k to 20k will
work.
DS005715-28
FIGURE 1. LM136 With Pot for Adjustment
of Breakdown Voltage
(Trim Range = ±120 mV typical)
DS005715-29
FIGURE 2. Temperature Coefficient Adjustment
(Trim Range = ±70 mV typical)
Low Cost 2 Amp Switching Regulator†
*L1 60 turns #16 wire on Arnold Core A-254168-2
†Efficiency ≈ 80%
5
DS005715-5
www.national.com
5 Page 
Physical Dimensions inches (millimeters) unless otherwise noted
Order Number LM136H-2.5, LM136H-2.5/883, LM236H-2.5, LM136AH-2.5, LM136AH-2.5/883 or LM236AH-2.5
NS Package Number H03H
Small Outline (SO) Package (M)
Order Number LM236M-2.5, LM236AM-2.5, LM336M-2.5 or LM336BM-2.5
NS Package Number M08A
11 www.national.com
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet LM236AM-2.5.PDF ] | |
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