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PDF XRP6657 Data sheet ( Hoja de datos )
| Número de pieza | XRP6657 | |
| Descripción | 1.5A 1.3MHz Synchronous Step Down Converter | |
| Fabricantes | Exar Corporation | |
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www.DataSheet.in
July 2009
XRP6657
1.5A 1.3MHz Synchronous Step Down Converter
Rev. 1.0.0
GENERAL DESCRIPTION
The XRP6657 is a high efficiency synchronous
step down DC to DC converter capable of
delivering up to 1.5 Amp of current and
optimized for portable battery-operated
applications.
Operating over an input voltage range of 2.5V
to 5.5V, it provides an adjustable regulated
output voltage down to 0.6V. The XRP6657
uses a constant 1.3 MHz frequency pulse width
modulation (PWM) scheme allowing for
compact external components, low output
voltage ripple and fixed frequency noise, while
Pulse Skip Mode (PSM) is used to improve
light load efficiency. A low dropout mode
provides 100% duty cycle operation.
The solution footprint is further reduced by a
current mode internal compensation network
and built-in synchronous switch removing the
need for an external Schottky. Over-current
and over-temperature protection insures safe
operations under abnormal operating
conditions.
The XRP6657 is available in a compact RoHS
compliant “green”/halogen free thin 6-pin DFN
package.
APPLICATIONS
• Point of Loads
• Set-Top Boxes
• Portable Media Players
• Hard Disk Drives
FEATURES
• Guaranteed 1.5A Output Current
− Fixed 1.3MHz Frequency PWM Operations
− Up to 95% efficiency
− Input Voltage: 2.5V to 5.5V
• Adjustable Output Voltage
• Internal Compensation Network
• No Schottky Diode Required
• LDO Operation: 100% Duty Cycle
• 240μA Quiescent Current (no load)
• 1μA Shutdown Current
• Soft Start Function
• Over-current/Over-temperature
Protection
• “Green”/Halogen Free DFN-6 Package
TYPICAL APPLICATION DIAGRAM
Fig. 1: XRP6657 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  
www.DataSheet.in
XRP6657
1.5A 1.3MHz Synchronous Step Down Converter
TYPICAL PERFORMANCE CHARACTERISTICS
All data taken at VIN = 2.7V to 5.5V, TJ = TA = 25°C, unless otherwise specified - Schematic and BOM from Application
Information section of this datasheet.
Fig. 4: Efficiency vs Output Current
VOUT=3.3V
Fig. 5: Efficiency vs Output Current
VOUT=1.8V
Fig. 6: Efficiency vs Output Current
VOUT=1.5V
Fig. 7: Efficiency vs Output Current
VOUT=1.2V
Fig. 8: Reference Voltage vs Temperature
Fig. 9: Output Voltage vs Load Current
© 2009 Exar Corporation
5/11
Rev. 1.0.0
5 Page 
www.DataSheet.in
XRP6657
1.5A 1.3MHz Synchronous Step Down Converter
REVISION
Revision
1.0.0
Date
07/14/2009 First release of data sheet
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.
© 2009 Exar Corporation
11/11
Rev. 1.0.0
11 Page | ||
| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet XRP6657.PDF ] | |
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