X RP 6 6 5 7
1.5A 1.3MHz Synchronous Step Down Converter
July 2009
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
EXAR [ EXAR CORPORATION ]
