VTT

LP2998

PVIN

VDDQ

VREF

AVIN

VREF = 0.75V

VSENSE

GND

+

+

+

VDDQ = 1.5V

VDD = 2.5V

VTT = 0.75V

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SD

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LP2998, LP2998-Q1

SNVS521K – DECEMBER 2007 – REVISED AUGUST 2014

LP2998/LP2998-Q1 DDR Termination Regulator

1 Features

3 Description

The LP2998 linear regulator is designed to meet

1

•

AEC-Q100 Test Guidance with the following

JEDEC SSTL-2 and JEDEC SSTL-18 specifications

results (SO PowerPAD-8):

for termination of DDR-SDRAM and DDR2 memory.

–

Device HBM ESD Classification Level H1C

The device also supports DDR3 and DDR3L VTT bus

–

Junction Temperature Range –40°C to 125°C

termination with VDDQ min of 1.35 V. The device

contains a high-speed operational amplifier to provide

•

1.35 V Minimum VDDQ

excellent response to load transients. The output

•

Source and Sink Current

stage prevents shoot through while delivering 1.5 A

•

Low Output Voltage Offset

continuous current and transient peaks up to 3 A in

the

application

as

required

for

DDR-SDRAM

•

No External Resistors Required

termination.

The

LP2998

also

incorporates

a

•

Linear Topology

VSENSE pin to provide superior load regulation and

•

Suspend to Ram (STR) Functionality

a VREF output as a reference for the chipset and

DIMMs.

•

Low External Component Count

•

Thermal Shutdown

An additional feature found on the LP2998 is an

active low shutdown (SD) pin that provides Suspend

2 Applications

To RAM (STR) functionality. When SD is pulled low

the

VTT output will tri-state providing a high

•

DDR1, DDR2, DDR3, and DDR3L Termination

impedance output, but, VREF will remain active. A

Voltage

power savings advantage can be obtained in this

•

Automotive Infotainment

mode through lower quiescent current.

•

FPGA

Device Information(1)

•

Industrial/Medical PC

PART NUMBER

PACKAGE

BODY SIZE (NOM)

•

SSTL-18, SSTL-2, and SSTL-3 Termination

LP2998

SO PowerPAD™ (8) 4.89 mm x 3.90 mm

•

HSTL Termination

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

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.