LP2996A Datasheet, PDF (1/29 Pages) Texas Instruments – DDR Termination Regulator

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LP2996A DDR Termination Regulator
LP2996A
SNOSCY7 – JUNE 2014
1 Features
•1 1.35V 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
• LP2998/8Q recommended for -40°C to 125°C
2 Applications
• DDR1, DDR2, DDR3, and DDR3L Termination
Voltage
• FPGA
• Industrial/Medical PC
• SSTL-2 and SSTL-3 Termination
• HSTL Termination
Simplified Schematic
LP2996A
SD
VDDQ = 1.5V
SD
VDDQ
VREF
VREF = 0.75V
+
0.012F
VDD = 2.5V
AVIN
VSENSE
+
472F
PVIN
VTT
GND
VTT = 0.75V
+
2202F
3 Description
The LP2996A linear regulator is designed to meet the
JEDEC SSTL-2 specifications for termination of DDR-
SDRAM. The device also supports DDR2, DDR3 and
DDR3L VTT bus termination with V_DDQ min of 1.35V.
The device contains a high-speed operational
amplifier to provide excellent response to load
transients. The output stage prevents shoot through
while delivering 1.5A continuous current and transient
peaks up to 3A in the application as required for
DDR-SDRAM termination. The LP2996A also
incorporates a V_SENSE 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 LP2996A 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)
LP2996A
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.
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.