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PDF XRP7657 Data sheet ( Hoja de datos )
| Número de pieza | XRP7657 | |
| Descripción | 25V Non Synchronous PWM Step Down Regulator | |
| Fabricantes | Exar Corporation | |
| Logotipo |  |
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September 2009
XRP7657
2A, 25V Non Synchronous PWM Step Down Regulator
Rev. 1.0.0
GENERAL DESCRIPTION
The XRP7657 is a non synchronous voltage
mode PWM step down (buck) regulator
capable of a constant output current up to
2Amps. A wide 4.75V to 25V input voltage
range allows for single supply operations from
industry standard 5V, 12V and 24V power
rails.
With a 420kHz constant operating frequency
and integrated high side switch, the XRP7657
reduces the overall component count and
solution footprint. In addition to a 2% output
setpoint accuracy, this device provides high
efficiency, low ripple and excellent line and
load regulation. An enable function and soft
start feature allow for controlled power up
sequencing implementation.
Built-in over current, output short-circuit and
over temperature protection insure safe
operations under abnormal operating
conditions.
The XRP7657 is offered in a RoHS compliant,
“green”/halogen free 8-pin SOIC package.
APPLICATIONS
• Distributed Power Architectures
• Point of Load Converters
• Audio-Video Equipments
• Medical & Industrial Equipments
FEATURES
• 2A Constant Output Current
• 4.75V to 25V Wide Input Voltage
• PWM Voltage Mode Control
− 420kHz Constant Operations
− Up to 94% Efficiency
• Adjustable Output Voltage
− 0.8V to 21V Range
− 2% Accuracy
• Soft-Start and Enable Function
• Built-in Thermal, Over Current and
Output Short Circuit Protection
• RoHS Compliant, “Green”/Halogen
Free 8-Pin SOIC Package
TYPICAL APPLICATION DIAGRAM
www.DataSheet4U.com
Fig. 1: XRP7657 Application 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  
XRP7657
2A, 25V Non Synchronous PWM Step Down Regulator
TYPICAL PERFORMANCE CHARACTERISTICS
All data taken at VIN=12V, VOUT=5V, TA=25°C, unless otherwise specified - Schematic and BOM from Application Information
section of this datasheet.
Fig. 4: Efficiency vs. Output Current
Fig. 5: Operation Frequency vs. Temperature
www.DataSheFeitg4.U6.c:oSmupply Quiescent Current vs. Input Voltage
Fig. 7: Efficiency vs. Input Voltage
Fig. 8:Shutdown Quiescent Current vs. Input Voltage
Fig. 9: OCP Current Limit vs. Temperature
© 2009 Exar Corporation
5/11
Rev. 1.0.0
5 Page 
XRP7657
2A, 25V Non Synchronous PWM Step Down Regulator
REVISION HISTORY
Revision
1.0
Date
09/25/09
Initial Release of Datasheet
Description
FOR FURTHER ASSISTANCE
Email:
Exar Technical Documentation:
http://www.exar.com/TechDoc/default.aspx?
www.DataSheet4U.com
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.
© 2009 Exar Corporation
11/11
Rev. 1.0.0
11 Page | ||
| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet XRP7657.PDF ] | |
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