LP2997MR/NOPB National Semiconductor, LP2997MR/NOPB Datasheet

IC DDR-II TERMINATION REG 8-PSOP

LP2997MR/NOPB

Manufacturer Part Number
LP2997MR/NOPB
Description
IC DDR-II TERMINATION REG 8-PSOP
Manufacturer
National Semiconductor
Datasheet

Specifications of LP2997MR/NOPB

Applications
Converter, DDR2
Voltage - Input
2.2 ~ 5.5 V
Number Of Outputs
1
Operating Temperature
0°C ~ 125°C
Mounting Type
Surface Mount
Package / Case
8-PSOP
Primary Input Voltage
1.8V
No. Of Outputs
1
No. Of Pins
8
Output Current
500mA
Operating Temperature Range
0°C To +125°C
Msl
MSL 3 - 168 Hours
Filter Terminals
SMD
Rohs Compliant
Yes
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Voltage - Output
-
Other names
*LP2997MR
*LP2997MR/NOPB
LP2997MR

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
LP2997MR/NOPB
Manufacturer:
NS
Quantity:
285
© 2011 National Semiconductor Corporation
DDR-II Termination Regulator
General Description
The LP2997 linear regulator is designed to meet the JEDEC
SSTL-18 specifications for termination of DDR-II memory.
The device contains a high-speed operational amplifier to
provide excellent response to load transients. The output
stage prevents shoot through while delivering 500mA contin-
uous current and transient peaks up to 900mA in the appli-
cation as required for DDR-II SDRAM termination. The
LP2997 also incorporates a V
load regulation and a V
chipset and DIMMs.
An additional feature found on the LP2997 is an active low
shutdown (SD) pin that provides Suspend To RAM (STR)
functionality. When SD is pulled low the V
state providing a high impedance output, but, V
active. A power savings advantage can be obtained in this
mode through lower quiescent current.
Typical Application Circuit
REF
output as a reference for the
SENSE
pin to provide superior
201094
TT
REF
output will tri-
will remain
LP2997
Features
Applications
Source and sink current
Low output voltage offset
No external resistors required
Linear topology
Suspend to Ram (STR) functionality
Low external component count
Thermal Shutdown
Available in SO-8, PSOP-8 packages
DDR-II Termination Voltage
SSTL-18 Termination
20109418
March 28, 2011
www.national.com

Related parts for LP2997MR/NOPB

LP2997MR/NOPB Summary of contents

Page 1

... Suspend To RAM (STR) functionality. When SD is pulled low the V state providing a high impedance output, but, V active. A power savings advantage can be obtained in this mode through lower quiescent current. Typical Application Circuit © 2011 National Semiconductor Corporation LP2997 Features ■ Source and sink current ■ ...

Page 2

Connection Diagrams Pin Descriptions SO-8 Pin or PSOP-8 Pin Ordering Information Order Number Package Type LP2997M LP2997MX LP2997MR PSOP-8 LP2997MRX PSOP-8 www.national.com PSOP-8 Layout SO-8 Layout Name GND Ground SD Shutdown VSENSE ...

Page 3

... Absolute Maximum Ratings If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. AVIN to GND PVIN to GND VDDQ (Note 2) Storage Temp. Range Junction Temperature Electrical Characteristics apply over the full Operating Temperature Range (T AVIN = 2.5V, PVIN = 1.8V, VDDQ = 1.8V. ...

Page 4

Note 1: Absolute maximum ratings indicate limits beyond which damage to the device may occur. Operating range indicates conditions for which the device is intended to be functional, but does not guarantee specific performance limits. For guaranteed specifications and test ...

Page 5

Typical Performance Characteristics and DDQ 20109420 20109422 20109426 20109421 REF DDQ 20109424 in SD Temperature ...

Page 6

Temperature IN Maximum Sinking Current 1.8V) DDQ Block Diagram www.national.com Maximum Sourcing Current DDQ 20109428 IN 20109436 1.8V 1.8V) IN 20109435 20109405 ...

Page 7

Description The LP2997 is a linear bus termination regulator designed to meet the JEDEC requirements of SSTL-18. The output capable of sinking and sourcing current while regulating the output voltage equal to VDDQ / 2. The output stage ...

Page 8

general recommendation the output capacitor should be sized above 100 µF with a low ESR for SSTL applications with DDR-SDRAM. The value of ESR should be determined by ...

Page 9

Typical Application Circuits Several different application circuits have been shown to il- lustrate some of the options that are possible in configuring the LP2997. Graphs of the individual circuit performance can be found in the Typical Performance Characteristics section in ...

Page 10

Physical Dimensions www.national.com inches (millimeters) unless otherwise noted 8-Lead Small Outline Package (M8) NS Package Number M08A 8-Lead PSOP Package (PSOP-8) NS Package Number MRA08A 10 ...

Page 11

Notes 11 www.national.com ...

Page 12

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