SDA datasheet(1/29 Pages) EXAR

部件名	SDA

功能描述	Quad Channel Digital PWM/PFM Programmable Power Management System

PDF	29 Pages

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制造商	EXAR [Exar Corporation]

网页	http://www.exar.com

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1 / 29 page

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October 2012

Rev. 1.0.1

Exar Corporation

www.exar.com

48720 Kato Road, Fremont CA 94538, USA

Tel. +1 510 668-7000 – Fax. +1 510 668-7001

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

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类似说明 - SDA

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