XRP2997 Datasheet, PDF (1/8 Pages) Exar Corporation – 2A DDR I/II/III Bus Termination Regulator

July 2011
XRP2997
2A DDR I/II/III Bus Termination Regulator
Rev. 1.0.0
GENERAL DESCRIPTION
The XRP2997 is a Double Data Rate (DDR)
termination voltage regulator supporting all
power requirements of DDR I, II and III
memories and is capable of sinking or sourcing
2A continuously.
Tightly regulating its output voltage within
±20mV, the XRP2997 converts input voltages
as low as 1.1V while the output voltage is
adjustable through an external resistor divider
or by forcing the V_REF pin voltage. It maintains
a fast line and load transient response and
only requires an output capacitance of 22µF to
operate. An enable function via an external
MOSFET and a soft start feature allow for a
controlled implementation of power-up
sequencing.
Built-in source/sink overcurrent, over-
temperature and under-voltage lockout
protections insure safe operation under
abnormal operating conditions.
The XRP2997 meets JEDEC SSTL-2, SSTL-18,
HSTL, SCSI-1 and SCSI-3 specifications for
DDR SDRAM memories.
The XRP2997 is offered in a RoHS compliant,
“green”/halogen free 8-pin Exposed Pad SOIC
package.
APPLICATIONS
 DDR I/II/III Memory Termination
 Active Termination Buses
 Audio-Video Equipments
 Video-Graphics Cards
FEATURES
 DDR1, DDR2 and DDR3 Support
 0.75V_TT Generation
 ±20mV Output Voltage Offset
 2 Amps Continuous Current Sourcing &
Sinking
 1.1V to 5.5V Wide Input Voltage Range
 Adjustable Output Voltage
 Suspend to RAM(STR), Enable & Soft
Start Functions
 Stable with 22µF Ceramic Capacitor
 UVLO, Over Temperature and Over
Current Protections
 Minimal External Components
 Pin/Function Compatible with SP2996B
 RoHS Compliant “Green”/Halogen Free
8-Pin SOIC Package
TYPICAL APPLICATION DIAGRAM
Fig. 1: XRP2997 DDRIII V_TT Application Diagram
Exar Corporation
48720 Kato Road, Fremont CA 94538, USA
www.exar.com
Tel. [phone] – Fax. [phone]