XRP6657_12 Datasheet, PDF (1/11 Pages) Exar Corporation – 1.5A 1.3MHz Synchronous Step Down Converter

February 2012
XRP6 6 5 7
1 .5 A 1 .3 M H z Sy n ch r o n o u s St e p D o w n Co n v e r t e r
Rev. 1.4.0
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 compens ation 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
FRPSOLDQW/ha³loJgeUn HfreHeQth´in 6- pin DFN
package.
TYPICAL APPLICATION DIAGRAM
APPLICATIONS
x Point of Loads
xSet - Top Boxes
x Portable Media Players
x Hard Disk Drives
FEATURES
x Guaranteed 1.5A Output Current
Fixed 1.3MHz Frequency PWM Operations
Up to 95% efficiency
Input Voltage: 2.5V to 5.5V
xAdjustab le Output Voltage
x Internal Compensation Network
x No Schottky Diode Required
x LDO Operation: 100% Duty Cycle
x Nj$4XLHVFHQW&XUUHQWQR
x Nj$6KXWGRZQ&XUUHQW
x Soft Start Function
xOver - current/Over - temperature
Protection
x³Green ´/Halogen Free DFN - 6 Package
Fig. 1: XRP6657 Application Diagram
Exar Corporation
48720 Kato Road, Fremont CA 94538, USA
www.exar.com
Tel. [phone] - 70 00 ±Fax. [phone] - 70 01