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| Número de pieza | SPX1431 | |
| Descripción | Precision Adjustable Shunt Regulator | |
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SPX1431
Precision Adjustable Shunt Regulator
April 2013
GENERAL DESCRIPTION
The SPX1431 is a 3-terminal adjustable shunt
voltage regulator providing a highly accurate
bandgap reference. The SPX1431 acts as an
open-loop error amplifier with a 2.5V
temperature compensation reference. The
SPX1431's thermal stability, wide operating
current (150mA) and temperature range
(-55°C to 125°C) makes it suitable for a
variety of applications that require a low cost,
high performance solution. SPX1431 tolerance
of 0.4% is proven to be sufficient to overcome
all of the other errors in the system to virtually
eliminate the need for trimming in the power
supply manufacturer's assembly lines and
contributes a significant cost savings.
The output voltage may be adjusted to any
value between VREF and 36 volts with two
external resistors. The SPX1431 is available in
SOIC-8 and SOT-89-3 packages.
APPLICATIONS
• Battery Operating Equipment
• Adjustable Supplies
• Switching Power Supplies
• Error Amplifiers
• Single Supply Amplifier
• Monitors / VCRs / TVs
• Personal Computers
Rev. 2.0.1
FEATURES
• Trimmed Bandgap Reference to 0.4%
• Wide Operating Current 1mA to 150mA
• -55°C to 125°C Extended Temperature
Range
• 30 ppm/°C Low Temperature
Coefficient
• Improved Replacement in Performance
for LT1431
• Low Cost Solution
• Offered in SOIC-8 and SOT-89
TYPICAL APPLICATION DIAGRAM
Fig. 1: SPX1431 Block Diagram
Exar Corporation
48720 Kato Road, Fremont CA 94538, USA
www.exar.com
Tel. +1 510 668-7000 – Fax. +1 510 668-7001
1 page  
SPX1431
Precision Adjustable Shunt Regulator
TYPICAL PERFORMANCE CHARACTERISTICS
All data taken at Unless otherwise indicated, VK = VREF, IK = 10mAµF, TA= 25°C.
Fig. 8: High Current Operating Characteristics
Fig. 9: Reference Voltage vs. Ambient Temperature
Fig. 10: Low Current Operating Characteristics
Fig. 11: Reference Input Current vs. Ambient Temperature
Fig. 12: Reference Voltage Line Regulation vs.
Cathode Voltage and TAMBIENT
Fig. 13: Noise Voltage vs. Frequency
© 2013 Exar Corporation
5/11
Rev. 2.0.1
5 Page 
SPX1431
Precision Adjustable Shunt Regulator
REVISION HISTORY
Revision
2.0.0
2.0.1
Date
04/26/2013
07/19/2013
Description
Reformat of Datasheet
Update of SOT89-3 package specification
Added ESD rating in Absolute Maximum Ratings
Updated Top Mark information and provided clarifying information
FOR FURTHER ASSISTANCE
Email:
Exar Technical Documentation:
http://www.exar.com/TechDoc/default.aspx?
EXAR CORPORATION
HEADQUARTERS AND SALES OFFICES
48720 Kato Road
Fremont, CA 94538 – USA
Tel.: +1 (510) 668-7000
Fax: +1 (510) 668-7030
www.exar.com
NOTICE
EXAR Corporation reserves the right to make changes to the products contained in this publication in order to improve
design, performance or reliability. EXAR Corporation assumes no responsibility for the use of any circuits described herein,
conveys no license under any patent or other right, and makes no representation that the circuits are free of patent
infringement. Charts and schedules contained here in are only for illustration purposes and may vary depending upon a
user’s specific application. While the information in this publication has been carefully checked; no responsibility, however,
is assumed for inaccuracies.
EXAR Corporation does not recommend the use of any of its products in life support applications where the failure or
malfunction of the product can reasonably be expected to cause failure of the life support system or to significantly affect its
safety or effectiveness. Products are not authorized for use in such applications unless EXAR Corporation receives, in
writing, assurances to its satisfaction that: (a) the risk of injury or damage has been minimized; (b) the user assumes all
such risks; (c) potential liability of EXAR Corporation is adequately protected under the circumstances.
Reproduction, in part or whole, without the prior written consent of EXAR Corporation is prohibited.
© 2013 Exar Corporation
11/11
Rev. 2.0.1
11 Page | ||
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