XRP7724 Datasheet, PDF (1/29 Pages) Exar Corporation – Quad Channel Digital PWM/PFM Programmable Power Management System

October 2012
XRP7724
Quad Channel Digital PWM/PFM
Programmable Power Management System
Rev. 1.0.1
GENERAL DESCRIPTION
The XRP7724 is a quad channel Digital Pulse
Width Modulated (DPWM) Step down (buck)
controller. A wide 4.75V to 5.5V and 5.5V to
25V input voltage dual range allows for single
supply operation from standard power rails.
With integrated FET gate drivers, two LDOs for
standby power and a 105kHz to 1.23MHz
independent channel to channel programmable
constant operating frequency, the XRP7724
reduces overall component count and solution
footprint and optimizes conversion efficiencies.
A selectable digital Pulse Frequency Mode
(DPFM) capable of better than 80% efficiency
at light current load and low operating current
allow for portable and Energy Star compliant
applications. Each XRP7724 output channel is
individually programmable as low as 0.6V with
a resolution as fine as 2.5mV, and
configurable for precise soft start and soft stop
sequencing, including delay and ramp control.
The XRP7724 operations are fully controlled
via a SMBus-compliant I²C interface allowing
for advanced local and/or remote
reconfiguration, full performance monitoring
and reporting as well as fault handling.
Built-in independent output over voltage, over
temperature, over-current and under voltage
lockout protections insure safe operation
under abnormal operating conditions.
The XRP7724 is offered in a RoHS compliant,
“green”/halogen free 44-pin TQFN package.
APPLICATIONS
 Servers
 Base Stations
 Switches/Routers
 Broadcast Equipment
 Industrial Control Systems
 Automatic Test Equipment
 Video Surveillance Systems
FEATURES
 Quad Channel Step-down Controller
 Digital PWM 105kHz-1.23MHz Operations
 Individual Channel Frequency Selection
 Patented digital PFM with Ultrasonic mode
 Patented Over Sampling Feedback
 Integrated MOSFET Drivers
 Programmable 5 coefficient PID control
 4.75V to 25V Input Voltage
 4.75V-5.5 and 5.5V-25V Input Ranges
 0.6V to 5.5V Output voltage
 SMBus Compliant - I²C Interface
 Full Power Monitoring and Reporting
 3 x 15V Capable PSIO + 2 x GPIOs
 Full Start/Stop Sequencing Support
 Built-in Thermal, Over-Current, UVLO
and Output Over-Voltage Protections
 On Board 5V and 3.3V Standby LDOs
 On Board Non-volatile Memory
 Supported by PowerArchitect™
TYPICAL APPLICATION DIAGRAM
Fig. 1: XRP7724 Application Diagram
Exar Corporation
48720 Kato Road, Fremont CA 94538, USA
www.exar.com
Tel. [phone] – Fax. [phone]