LP2998 Datasheet, PDF (1/33 Pages) Intersil Corporation – DDR-II and DDR-I Termination Regulator

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LP2998, LP2998-Q1
SNVS521K – DECEMBER 2007 – REVISED AUGUST 2014
LP2998/LP2998-Q1 DDR Termination Regulator
1 Features
•1 AEC-Q100 Test Guidance with the following
results (SO PowerPAD-8):
– Device HBM ESD Classification Level H1C
– Junction Temperature Range –40°C to 125°C
• 1.35 V Minimum V_DDQ
• 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
2 Applications
• DDR1, DDR2, DDR3, and DDR3L Termination
Voltage
• Automotive Infotainment
• FPGA
• Industrial/Medical PC
• SSTL-18, SSTL-2, and SSTL-3 Termination
• HSTL Termination
3 Description
The LP2998 linear regulator is designed to meet
JEDEC SSTL-2 and JEDEC SSTL-18 specifications
for termination of DDR-SDRAM and DDR2 memory.
The device also supports DDR3 and DDR3L VTT bus
termination with V_DDQ min of 1.35 V. The device
contains a high-speed operational amplifier to provide
excellent response to load transients. The output
stage prevents shoot through while delivering 1.5 A
continuous current and transient peaks up to 3 A in
the application as required for DDR-SDRAM
termination. The LP2998 also incorporates a
VSENSE pin to provide superior load regulation and
a V_REF output as a reference for the chipset and
DIMMs.
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
the V_TT output will tri-state providing a high
impedance output, but, V_REF will remain active. A
power savings advantage can be obtained in this
mode through lower quiescent current.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
LP2998
SO PowerPAD™ (8) 4.89 mm x 3.90 mm
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
SD
V_DDQ = 1.5V
V_DD = 2.5V
+
C_IN
LP2998
SD
V_DDQ
V_REF
AV_IN
V_SENSE
PV_IN
V_TT
GND
+
C_REF
V_REF = 0.75V
+
C_OUT
V_TT = 0.75V
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.