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PDF XRP6668 Data sheet ( Hoja de datos )
| Número de pieza | XRP6668 | |
| Descripción | 1A/1A Dual Channel 1.5MHz Sync. Step Down Converter | |
| Fabricantes | Exar Corporation | |
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January 2011
XRP6668
1A/1A Dual Channel 1.5MHz Sync. Step Down Converter
Rev. 1.2.0
GENERAL DESCRIPTION
The XRP6668 is a dual channel synchronous
current mode PWM step down (buck)
converter capable of delivering up to 1 Amp of
current per channel and optimized for portable
battery-operated applications.
Based on a current mode 1.5MHz constant
frequency PWM control scheme, the XRP6668
reduces the overall component count and
solution footprint as well as provides a low
output voltage ripple and excellent line and
load regulation. It also implements a PFM
mode to improve light load efficiency as well
as a 100% duty cycle LDO mode. Output
voltage is adjustable to as low as 0.6V with a
better than 3% accuracy while a low quiescent
current supports the most stringent battery
operating conditions.
Built-in over temperature and under voltage
lock-out protections insure safe operations
under abnormal operating conditions.
The XRP6668 is offered in a RoHS compliant,
“green”/halogen free 8-pin exposed pad SOIC
package.
APPLICATIONS
• Portable Equipments
• Battery Operated Equipments
• Audio-Video Equipments
• Networking & Telecom Equipments
FEATURES
• Dual Channel Step Down Converter
• Guaranteed 1A/1A Output Current
− Input Voltage: 2.5V to 5.5V
• 1.5MHz PWM Current Mode Control
− PFM Mode Operations at Light Load
− 100% Duty Cycle LDO Mode Operations
• Adjustable Output Voltage Range
− As Low as 0.6V with ±3% Accuracy
• Internal Compensation Network
• 30µA Quiescent Current
• Over Temperature & UVLO Protections
• RoHS Compliant “Green”/Halogen Free
8-Pin Exposed Pad SOIC Package
TYPICAL APPLICATION DIAGRAM
Fig. 1: XRP6668 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  
XRP6668
1A/1A Dual Channel 1.5MHz Sync. Step Down Converter
TYPICAL PERFORMANCE CHARACTERISTICS
All data taken at VIN = 3.6V, TJ = TA = 25°C and apply to each individual channel 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=1.2V)
Fig. 6: Oscillator Frequency vs Temperature
Fig. 7: Oscillator Frequency vs Supply Voltage
Fig. 8: RDS(ON) vs Temperature
Fig. 9: RDS(ON) vs Input Voltage
© 2011 Exar Corporation
5/11
Rev. 1.2.0
5 Page 
XRP6668
1A/1A Dual Channel 1.5MHz Sync. Step Down Converter
REVISION HISTORY
Revision
1.0.0
1.1.0
1.2.0
Date
Description
09/16/2010 Initial release of datasheet
11/15/2010 Corrected ∆
equation: changed
to . Updated ‘Output Voltage selection’ section.
01/14/2011
Added specific test conditions and data in Electrical Specification Table for output voltage
accuracy for operations below 3V.
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.
© 2011 Exar Corporation
11/11
Rev. 1.2.0
11 Page | ||
| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet XRP6668.PDF ] | |
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