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PDF XRP6658 Data sheet ( Hoja de datos )
| Número de pieza | XRP6658 | |
| Descripción | 1A 1.5MHz PFM/PWM Synchronous Step-Down Converter | |
| Fabricantes | Exar Corporation | |
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XRP6658
1A 1.5MHz PFM/PWM Synchronous Step-Down Converter
January 2014
GENERAL DESCRIPTION
The XRP6658 is a synchronous current mode
PWM step down (buck) converter capable of
delivering up to 1 Amp of current and
optimized for portable battery-operated
applications.
Based on a current mode 1.5MHz constant
frequency PWM control scheme, the XRP6658
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 XRP6658 is offered in a RoHS compliant,
“green”/halogen free 5-pin SOT23 package.
Rev. 1.6.0
APPLICATIONS
• Portable Equipments
• Battery Operated Equipments
• Audio-Video Equipments
• Networking & Telecom Equipments
FEATURES
• Guaranteed 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
− Achieves 97% Efficiency
• Adjustable Output Voltage Range
− As Low as 0.6V with ±3% Accuracy
• Internal Compensation Network
• 15µA Quiescent Current
• Over Temperature & UVLO Protections
• RoHS Compliant “Green”/Halogen Free
5-Pin SOT23 Package
TYPICAL APPLICATION DIAGRAM
Fig. 1: XRP6658 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  
XRP6658
1A 1.5MHz PFM/PWM Synchronous Step-Down Converter
TYPICAL PERFORMANCE CHARACTERISTICS
All data taken at VIN = 3.6V, 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=1.2V)
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
© 2014 Exar Corporation
5/11
Rev. 1.6.0
5 Page 
XRP6658
1A 1.5MHz PFM/PWM Synchronous Step-Down Converter
REVISION HISTORY
Revision
1.0.0
1.1.0
1.2.0
1.3.0
1.4.0
1.5.0
1.6.0
Date
09/16/2010
09/30/2010
11/15/2010
01/14/2011
07/19/2011
0/15/2011
1/13/2014
Description
Initial release of datasheet
Corrected pin-out on schematics Figures 1, 23 and 24
Corrected ∆
equation: changed
to % . Updated ‘Output Voltage selection’ section.
Added specific test conditions and data in Electrical Specification Table for output voltage
accuracy, reference voltage Line regulation and output voltage line regulation for operations
below 3V.
Corrected typographical errors on package specification table parameters “b” and “e”
Added a range for the selection of lower feedback resistor.
Added “Junction Temperature Range TJ……-40°C to 125°C” to operating ratings;
In “Ordering Information” changed the temperature range to “-40°C≤TJ≤+125°C”
[ECN: 1403-04]
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.
© 2014 Exar Corporation
11/11
Rev. 1.6.0
11 Page | ||
| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet XRP6658.PDF ] | |
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