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PDF ( 数据手册 , 数据表 ) TJ2997

零件编号 TJ2997
描述 DDR Termination Regulator
制造商 HTC Korea
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TJ2997 数据手册, 描述, 功能
DDR Termination Regulator
TJ2997
FEATURES
z Source and sink current
z Low output voltage offset
z No external resistors required
z Linear topology
z Suspend to Ram (STR) functionality
z Low external component count
z Thermal Shutdown
z Available in SOP8, SOP8-PP Packages
APPLICATION
z DDR -II and -III Termination Voltage
z SSTL Termination
z HSTL Termination
SOP8 / SOP8-PP PKG
ORDERING INFORMATION
Device
TJ2997GD
TJ2997GDP
Package
SOP8
SOP8-PP
DESCRIPSION
The TJ2997 linear regulator is designed to meet the JEDEC SSTL specifications for termination of DDR-
SDRAM. The device contains a high-speed operational amplifier to provide excellent response to load
transients. The output stage prevents shoot through while delivering up to 1.5A continuous current and
transient peaks up to 3A with respect to PVIN operating condition in the application as required for DDR-
SDRAM termination. The TJ2997 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 TJ2997 is an
active high enable (EN) pin that provides Suspend To RAM (STR) functionality. When EN 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.
Absolute Maximum Ratings
CHARACTERISTIC
Supply Voltage to GND
Lead Temperature (Soldering, 10 sec)
Storage Temperature Range
Operating Junction Temperature Range
Recommended Operation Range
SYMBOL
PVIN
AVIN
VDDQ
TSOL
TSTG
TJOPR
MIN.
-0.3
-0.3
-0.3
-65
-40
MAX.
6.0
6.0
6.0
260
150
125
UNIT
V
CHARACTERISTIC
AVIN to GND
PVIN & EN to GND
Ordering Information
SYMBOL
AVIN
PVIN & EN
MIN.
2.3
0
MAX.
5.5
AVIN
UNIT
V
V
Package
SOP8
SOP8-PP
Order No.
TJ2997GD
TJ2997GDP
Description
DDR Termination Regulator
DDR Termination Regulator
Package Marking
TJ2997G
TJ2997G
Supplied As
Reel
Reel
Apr, 2011 - R1.0.1
1/13
HTC
Free Datasheet http://www.datasheet4u.com/







TJ2997 pdf, 数据表
DDR Termination Regulator
TJ2997
sinking and sourcing current. Although only one equation will add into the total, VTT cannot source and
sink current simultaneously.
PVTT = VVTT x ILOAD (Sinking) or PVTT = ( VPVIN - VVTT) x ILOAD (Sourcing)
The power dissipation of the TJ2997 can also be calculated during the shutdown state. During this
condition the output VTT will tri-state, therefore that term in the power equation will disappear as it
cannot sink or source any current (leakage is negligible). The only losses during shutdown will be
the reduced quiescent current at AVIN and the constant impedance that is seen at the VDDQ pin.
PD = PAVIN + PVDDQ ,
Where, PAVIN = IAVIN x VAVIN
PVDDQ = VVDDQ x IVDDQ
= VVDDQ2
x RVDDQ
Apr, 2011 - R1.0.1
8/13 HTC
Free Datasheet http://www.datasheet4u.com/














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