XRP7725 Datasheet, PDF (1/34 Pages) Exar Corporation – Power Management System

XRP7725
Intel Node Manager Compatible Programmable
Power Management System
January 2014
Rev. 1.0.0
GENERAL DESCRIPTION
The XRP7725 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 XRP7725
reduces overall component count and solution
footprint and optimizes conversion efficiencies.
A selectable digital Pulse Frequency Mode
(DPFM) and low operating current result in
better than 80% efficiency down to 10mA load
provides support for portable and Energy Star
compliant applications. Each XRP7725 output
channel is individually programmable down to
a minimum 0.6V with a resolution of 2.5mV,
and configurable for precise soft start and soft
stop sequencing, including delay and ramp
control.
The XRP7725 operation is fully controlled via
an 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 XRP7725 is offered in a RoHS compliant,
“green”/halogen free 44-pin TQFN package.
FEATURES
• Quad Channel Step-down Controller
− Digital PWM 105kHz-1.23MHz Operation
− Individual Channel Frequency Selection
− Patented digital PFM with Ultrasonic mode
− Patented Over Sampling Feedback
• Instantaneous current monitoring –
Intel^® Node Manager Compatible
• 4.75V to 25V Input Voltage
− 4.75V-5.5V 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™ 5
APPLICATIONS
• Blade Servers
• Micro Servers
• Network Adapter Cards
• Base Stations
• Switches/Routers
• Broadcast Equipment
• Industrial Control Systems
• Automatic Test Equipment
TYPICAL APPLICATION DIAGRAM
XRP7725
Figure 1: XRP7725 Application Diagram
Exar Corporation
48720 Kato Road, Fremont CA 94538, USA
www.exar.com
Tel. [phone] – Fax. [phone]