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LP2998 Datasheet Preview

LP2998 Datasheet

DDR Termination Regulator

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LP2998, LP2998-Q1
SNVS521K – DECEMBER 2007 – REVISED AUGUST 2014
LP2998/LP2998-Q1 DDR Termination Regulator
1 Features
1 AEC-Q100 Test Guidance with the following
results (SO PowerPAD-8):
– Device HBM ESD Classification Level H1C
– Junction Temperature Range –40°C to 125°C
• 1.35 V Minimum VDDQ
• 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
2 Applications
• DDR1, DDR2, DDR3, and DDR3L Termination
Voltage
• Automotive Infotainment
• FPGA
• Industrial/Medical PC
• SSTL-18, SSTL-2, and SSTL-3 Termination
• HSTL Termination
3 Description
The LP2998 linear regulator is designed to meet
JEDEC SSTL-2 and JEDEC SSTL-18 specifications
for termination of DDR-SDRAM and DDR2 memory.
The device also supports DDR3 and DDR3L VTT bus
termination with VDDQ min of 1.35 V. The device
contains a high-speed operational amplifier to provide
excellent response to load transients. The output
stage prevents shoot through while delivering 1.5 A
continuous current and transient peaks up to 3 A in
the application as required for DDR-SDRAM
termination. The LP2998 also incorporates a
VSENSE pin to provide superior load regulation and
a VREF output as a reference for the chipset and
DIMMs.
An additional feature found on the LP2998 is an
active low shutdown (SD) pin that provides Suspend
To RAM (STR) functionality. When SD is pulled low
the VTT output will tri-state providing a high
impedance output, but, VREF will remain active. A
power savings advantage can be obtained in this
mode through lower quiescent current.
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (NOM)
LP2998
SO PowerPAD™ (8) 4.89 mm x 3.90 mm
LP2998
SOIC (8)
4.90 mm x 3.91 mm
LP2998-Q1
SO PowerPAD™ (8) 4.89 mm x 3.90 mm
(1) For all available packages, see the orderable addendum at
the end of the datasheet.
4 Simplified Schematic
SD
VDDQ = 1.5V
VDD = 2.5V
+
CIN
LP2998
SD
VDDQ
VREF
AVIN
VSENSE
PVIN
VTT
GND
+
CREF
VREF = 0.75V
+
COUT
VTT = 0.75V
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.




etcTI

LP2998 Datasheet Preview

LP2998 Datasheet

DDR Termination Regulator

No Preview Available !

LP2998, LP2998-Q1
SNVS521K – DECEMBER 2007 – REVISED AUGUST 2014
www.ti.com
Table of Contents
1 Features .................................................................. 1
2 Applications ........................................................... 1
3 Description ............................................................. 1
4 Simplified Schematic............................................. 1
5 Revision History..................................................... 2
6 Pin Configuration and Functions ......................... 3
6.1 Pin Descriptions ........................................................ 3
7 Specifications......................................................... 5
7.1 Absolute Maximum Ratings ..................................... 5
7.2 Handling Ratings: LP2998 ........................................ 5
7.3 Handling Ratings: LP2998-Q1 .................................. 5
7.4 Recommended Operating Conditions....................... 5
7.5 Thermal Information .................................................. 5
7.6 Electrical Characteristics........................................... 6
7.7 Typical Characteristics .............................................. 8
8 Detailed Description ............................................ 11
8.1 Overview ................................................................. 11
8.2 Functional Block Diagram ...................................... 11
8.3 Feature Description................................................. 11
8.4 Device Functional Modes........................................ 11
9 Application and Implementation ........................ 13
9.1 Application Information .......................................... 13
9.2 Typical Application .................................................. 15
10 Power Supply Recommendations ..................... 20
11 Layout................................................................... 20
11.1 Layout Guidelines ................................................. 20
11.2 Layout Examples................................................... 21
12 Device and Documentation Support ................. 22
12.1 Related Links ........................................................ 22
12.2 Trademarks ........................................................... 22
12.3 Electrostatic Discharge Caution ............................ 22
12.4 Glossary ................................................................ 22
13 Mechanical, Packaging, and Orderable
Information ........................................................... 22
5 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Revision J (December 2013) to Revision K
Page
• Added DDR3 support throughout datasheet .......................................................................................................................... 1
• Changed formatting to match new TI datasheet guidelines; added Device Information and Handling Ratings tables,
Power Supply, Layout Examples, and Device and Documentation Support sections; reformatted Detailed
Description and Application and Implementation sections. ................................................................................................... 1
• Changed Electrical Char table condition statement .............................................................................................................. 6
• Changed Electrical Char table condition statement .............................................................................................................. 7
Changes from Revision I (April 2013) to Revision J
Page
• Added AEC-Q100 Test Guidance .......................................................................................................................................... 1
• Changed layout of National Data Sheet to TI format ........................................................................................................... 20
2
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Copyright © 2007–2014, Texas Instruments Incorporated
Product Folder Links: LP2998 LP2998-Q1


Part Number LP2998
Description DDR Termination Regulator
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