LP2997MRXSLASHNOPBG4.A中文资料德州仪器数据手册PDF规格书

1FEATURES

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

APPLICATIONS

• DDR-II Termination Voltage

• SSTL-18 Termination

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.

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 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.