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National Semiconductor Electronic Components Datasheet

LP2995 Datasheet

DDR Termination Regulator

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July 2003
LP2995
DDR Termination Regulator
General Description
The LP2995 linear regulator is designed to meet the JEDEC
SSTL-2 and SSTL-3 specifications for termination of DDR-
SDRAM. The device contains a high-speed operational am-
plifier 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
LP2995 also incorporates a VSENSE pin to provide superior
load regulation and a VREF output as a reference for the
chipset and DDR DIMMS.
Patents Pending
Features
n Low output voltage offset
n Works with +5v, +3.3v and 2.5v rails
n Source and sink current
n Low external component count
n No external resistors required
n Linear topology
n Available in SO-8, PSOP-8 or LLP-16 packages
n Low cost and easy to use
Applications
n DDR Termination Voltage
n SSTL-2
n SSTL-3
Typical Application Circuit
20039302
© 2003 National Semiconductor Corporation DS200393
www.national.com


National Semiconductor Electronic Components Datasheet

LP2995 Datasheet

DDR Termination Regulator

No Preview Available !

Connection Diagrams
SO-8 (M08A) Package
LQA- 16 Package
20039320
Top View
PSOP-8 (MRA08A) Package
Top View
20039304
Top View
20039350
Pin Description
SO-8 Pin or
PSOP-8 Pin
1
2
3
4
LLP Pin
1,3,4,6,9, 13,16
2
5
7
58
6 10
7 11, 12
8 14, 15
Ordering Information
Order Number
LP2995M
LP2995MX
LP2995MR
LP2995MRX
LP2995LQ
LP2995LQX
Package Type
SO-8
SO-8
PSOP-8
PSOP-8
LLP-16
LLP-16
Name
NC
GND
VSENSE
VREF
VDDQ
AVIN
PVIN
VTT
Function
No internal connection. Can be used for vias.
Ground.
Feedback pin for regulating VTT.
Buffered internal reference voltage of
VDDQ/2.
Input for internal reference equal to VDDQ/2.
Analog input pin.
Power input pin.
Output voltage for connection to termination
resistors.
NSC Package
Drawing
M08A
M08A
MRA08A
MRA08A
LQA16A
LQA16A
Supplied As
95 Units per Rail
2500 Units Tape and Reel
95 Units per Rail
2500 Units Tape and Reel
1000 Units Tape and Reel
4500 Units Tape and Reel
www.national.com
2


Part Number LP2995
Description DDR Termination Regulator
Maker National Semiconductor
PDF Download

LP2995 Datasheet PDF






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