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LP2997

更新时间： 2024-11-06 11:10:35
品牌 Logo 应用领域
德州仪器 - TI 双倍数据速率稳压器
页数 文件大小 规格书
25页 1155K
描述
DDR-II 终止稳压器

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LP2997 数据手册

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LP2997  
www.ti.com  
SNVS295F –MAY 2004–REVISED APRIL 2013  
LP2997 DDR-II Termination Regulator  
Check for Samples: LP2997  
1
FEATURES  
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 continuous current  
and transient peaks up to 900mA in the application as  
required for DDR-II SDRAM termination. The LP2997  
also incorporates a VSENSE pin to provide superior  
load regulation and a VREF output as a reference for  
the chipset and DIMMs.  
2
•
•
•
•
•
•
•
•
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 SOIC-8, SO PowerPAD-8 Packages  
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  
APPLICATIONS  
•
•
DDR-II Termination Voltage  
SSTL-18 Termination  
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.  
Typical Application Circuit  
LP2997  
0.9V  
=
VREF  
VREF  
SD  
AV  
SD  
+
+
CREF  
AVIN = 2.5V  
IN  
V SENSE  
VTT  
VDDQ  
PV  
VDDQ = 1.8V  
V TT= 0.9V  
IN  
+
GND  
CIN  
C OUT  
Figure 1. Typical Application Circuit  
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 © 2004–2013, Texas Instruments Incorporated  
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LP2997 替代型号

型号 品牌 替代类型 描述 数据表
LP2996-N TI

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