LP2995
LP2995 is DDR Termination Regulator manufactured by National Semiconductor.
Description
The LP2995 linear regulator is designed to meet the JEDEC SSTL-2 and SSTL-3 specifications for termination of DDRSDRAM. 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 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 n n n n n n n Low output voltage offset Works with +5v, +3.3v and 2.5v rails Source and sink current Low external ponent count No external resistors required Linear topology Available in SO-8, PSOP-8 or LLP-16 packages Low cost and easy to use
Applications n DDR Termination Voltage n SSTL-2 n SSTL-3
Typical Application Circuit
© 2003 National Semiconductor Corporation
DS200393
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Connection Diagrams
SO-8 (M08A) Package LQA- 16 Package
Top View
Top View PSOP-8 (MRA08A) Package
Top View
Pin Description
SO-8 Pin or PSOP-8 Pin 1 2 3 4 5 6 7 8 LLP Pin 1,3,4,6,9, 13,16 2 5 7 8 10 11, 12 14, 15 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.
Ordering Information
Order Number LP2995M LP2995MX LP2995MR LP2995MRX LP2995LQ LP2995LQX Package Type SO-8 SO-8 PSOP-8 PSOP-8 LLP-16 LLP-16 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
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Absolute Maximum Ratings
(Note 1)
Lead Temperature (Soldering, 10...
