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LP2998MR

更新时间: 2024-11-01 12:09:55
品牌 Logo 应用领域
德州仪器 - TI 稳压器双倍数据速率
页数 文件大小 规格书
26页 1179K
描述
LP2998 DDR-I and DDR-II Termination Regulator

LP2998MR 数据手册

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LP2998  
www.ti.com  
SNVS521I DECEMBER 2007REVISED APRIL 2013  
LP2998 DDR-I and DDR-II Termination Regulator  
Check for Samples: LP2998  
1
FEATURES  
DESCRIPTION  
The LP2998 linear regulator is designed to meet  
JEDEC SSTL-2 and JEDEC SSTL-18 specifications  
for termination of DDR1-SDRAM and DDR-II  
2
Source and Sink Current  
Low Output Voltage Offset  
No External Resistors Required  
Linear Topology  
memory. The device contains  
a
high-speed  
operational amplifier to provide excellent response to  
load transients. The output stage prevents shoot  
through while delivering 1.5A continuous current as  
required for DDR1-SDRAM termination, and 0.5A  
continuous current as required for DDR-II 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.  
Suspend to Ram (STR) Functionality  
Low External Component Count  
Thermal Shutdown  
Available in SOIC-8, SO PowerPAD-8 Packages  
APPLICATIONS  
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,  
DDR-I, DDR-II and DDR-III Termination Voltage  
SSTL-18 Termination  
the VTT output will tri-state providing  
a
high  
SSTL-2 and SSTL-3 Termination  
HSTL Termination  
impedance output, while VREF remains active. A  
power savings advantage can be obtained in this  
mode through lower quiescent current.  
Typical Application Circuit  
LP2998  
V
= 0.9V  
V
REF  
REF  
SD  
AV  
SD  
+
+
C
C
REF  
AV = 2.5V  
IN  
IN  
V
VSENSE  
V
= 1.8V  
DDQ  
DDQ  
PV  
IN  
V
= 0.9V  
V
TT  
TT  
+
GND  
C
OUT  
IN  
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of  
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.  
All trademarks are the property of their respective owners.  
2
PRODUCTION DATA information is current as of publication date.  
Products conform to specifications per the terms of the Texas  
Instruments standard warranty. Production processing does not  
necessarily include testing of all parameters.  
Copyright © 2007–2013, Texas Instruments Incorporated  

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