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PDF SPX1587 Data sheet ( Hoja de datos )
| Número de pieza | SPX1587 | |
| Descripción | 3A Low Dropout Voltage Regulator | |
| Fabricantes | Exar | |
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September 2010
GENERAL DESCRIPTION
The SPX1587 is a low power positive-voltage
regulator designed to satisfy moderate power
requirements with a cost effective, small
footprint solution.
This device is an excellent choice for use in
battery-powered applications and portable
computers. The SPX1587 features very low
quiescent current and a low dropout voltage of
1.1V at a full load. As output current
decreases, quiescent current flows into the
load, increasing efficiency. SPX1587 is
available in adjustable or fixed 1.5V, 2.5V,
3.3V and 5.0V output voltages.
The SPX1587 is offered in several 3-pin
surface mount packages: TO-252, TO-220 and
TO-263. An output capacitor of 10μF ceramic
or tantalum provides unconditional stability.
FUNCTIONAL DIAGRAM
SPX1587
3A Low Dropout Voltage Regulator
Rev. 2.0.0
APPLICATIONS
• Desktop PC's Servers
• Powering VGA and Sound Cards
• Adjustable Power Supplies
• Portable Instrumentation
FEATURES
• Guaranteed 3A Output Current
• Three Terminal Adjustable or Fixed
1.5V, 2.5V, 3.3V and 5.0V
• Low Quiescent Current
• Low Dropout Voltage: 1.1V at 3A
• Line Regulation: 0.1%
• Load Regulation: 0.1%
• Stable with 10uF Ceramic Capacitor
• Over Current and Thermal Protection
• Similar to Industry Standard
LT1085/LT1585
• RoHS Compliant Lead Free 3-Pin
TO-220, TO-252 and TO-263 Packages
Fig. 1: SPX1587 Functional Diagram (Adjustable version)
Exar Corporation
48720 Kato Road, Fremont CA 94538, USA
www.exar.com
Tel. +1 510 668-7000 – Fax. +1 510 668-7001
1 page  
SPX1587
3A Low Dropout Voltage Regulator
TYPICAL PERFORMANCE CHARACTERISTICS
All data taken at VIN = VOUT + 1.5V, TA = 25°C, CIN = COUT =10µF, IOUT=10mA unless otherwise specified - Schematic and
BOM from Application Information section of this datasheet.
Fig. 4: Line Regulation for SPX1587U-3-3
IOUT=10mA
Fig. 5: VOUT versus Temperature
VIN=2.5V, IOUT=10mA
Fig. 6: VOUT versus Temperature
VIN=4.0V, IOUT=10mA
Fig. 7: VOUT versus Temperature
VIN=5.0V, IOUT=10mA
APPLICATION INFORMATION
OUTPUT CAPACITOR
To ensure the stability of the SPX1587, an
output capacitor of at least 10μF (ceramic or
tantalum) or 22μF (aluminum) is required. The
value may change based on the application
requirements of the output load or
temperature range. The value of ESR can vary
based on the type of capacitor used in the
applications to guarantee stability. The
recommended value for ESR is 0.5Ω or less. A
larger value of output capacitance (up to
100μF) can improve the load transient
response.
SOLDERING METHODS
The SPX1587 die is attached to the heatsink
lead which exits opposite the input, output,
and ground pins.
THERMAL CHARACTERISTICS
The SPX1587 features the internal thermal
limiting to protect the device during overload
conditions. Special care needs to be taken
during continuous load conditions such that
the maximum junction temperature does not
exceed 125°C. Thermal protection is activated
at >179°C and deactivated at <165 °C.
The thermal interaction from other
components in the application can affect the
© 2010 Exar Corporation
5/11
Rev. 2.0.0
5 Page 
SPX1587
3A Low Dropout Voltage Regulator
REVISION HISTORY
Revision
Date
2.0.0
Reformat of datasheet
Added marking information
Description
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.
© 2010 Exar Corporation
11/11
Rev. 2.0.0
11 Page | ||
| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet SPX1587.PDF ] | |
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