XRP6658 Datasheet, PDF (1/11 Pages) Exar Corporation – 1A 1.5MHz PFM/PWM Synchronous Step-Down Converter

September 2011
XRP6658
1A 1.5MHz PFM/PWM Synchronous Step-Down Converter
Rev. 1.5.0
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.
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. [phone] – Fax. [phone]