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PDF LM431CIM Data sheet ( Hoja de datos )
| Número de pieza | LM431CIM | |
| Descripción | Adjustable Precision Zener Shunt Regulator | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de LM431CIM (archivo pdf) en la parte inferior de esta página. Total 13 Páginas | ||
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December 1999
LM431
Adjustable Precision Zener Shunt Regulator
General Description
The LM431 is a 3-terminal adjustable shunt regulator with
guaranteed temperature stability over the entire temperature
range of operation. It is now available in a chip sized pack-
age (4-Bump micro SMD) using National’s micro SMD pack-
age technology. The output voltage may be set at any level
greater than 2.5V (VREF) up to 36V merely by selecting two
external resistors that act as a voltage divided network. Due
to the sharp turn-on characteristics this device is an excel-
lent replacement for many zener diode applications.
Features
n Average temperature coefficient 50 ppm/˚C
n Temperature compensated for operation over the full
temperature range
n Programmable output voltage
n Fast turn-on response
n Low output noise
n LM431 in micro SMD package
Connection Diagrams
TO-92: Plastic Package
SOT-23: 3-Lead Small Outline
Top View
DS010055-1
SO-8: 8-Pin Surface Mount
Top view
DS010055-2
Top View
DS010055-28
4-Bump micro SMD
DS010055-54
Top View
(bump side down)
© 1999 National Semiconductor Corporation DS010055
www.national.com
1 page  
LM431
Electrical Characteristics (Continued)
The average temperature coefficient of the reference input voltage, ∝VREF, is defined as:
DS010055-7
Where:
T2 − T1 = full temperature change (0-70˚C).
∝VREF can be positive or negative depending on whether the slope is positive or negative.
Example: VDEV = 8.0 mV, VREF = 2495 mV, T2 − T1 = 70˚C, slope is positive.
Note 6: The dynamic output impedance, rZ, is defined as:
When the device is programmed with two external resistors, R1 and R2, (see Figure 2 ), the dynamic output impedance of the overall circuit, rZ, is defined as:
Equivalent Circuit
DS010055-3
5 www.national.com
5 Page 
Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
NS Package Number Z03A
11 www.national.com
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet LM431CIM.PDF ] | |
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