Features 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 Available in SO-8, PSOP-8 packages Description The LP2997 linear regulator is designed to meet the JEDEC SSTL-18 specifications for termination of DDR-II memory. The device contains a high-speed operational amplifier to provide excellent response to load transients. The output stage prevents shoot through while delivering 500mA continuous current and transient peaks up to 900mA in the application as required for DDR-II SDRAM termination. The LP2997 also incorporates a VSENSE pin to provide superior load regulation and a VREF output as a reference for the chipset and DIMMs. An additional feature found on the LP2997 is an active low shutdown ( ^SD) pin that provides Suspend To RAM (STR) functionality. When ^SD is pulled low the VTT output will tri-state providing a high impedance output, but, VREF will remain active. A power savings advantage can be obtained in this mode through lower quiescent current. Applications DDR-II Termination Voltage SSTL-18 Termination

Also Recommended LM2744▲ Switching Termination Regulator LP2996▲ DDR-I And DDR-II Linear Termination Regulator

Typical Application click for larger image	Block Diagram click for larger image
Typical Performance click for larger image

Datasheets

Title		Size	Date	Other Language
	LP2997 DDR-II Termination Regulator	282 Kbytes	28-Mar-11

Part Number(s) (NSID)	Top View	Availability	Current Reported Stock	Budgetary Pricing	Pack Size
LP2997M/NOPB LP2997M RoHS Status	SOIC NARROW	Full production Lead Time: 6 weeks	Distributor Region Qty ARROW Worldwide 59 AVNET-EM Worldwide 1412 CEAC Asia Pacific 5320 DIGI-KEY Worldwide 4689 FARNELL Europe and Asia 1094 MOUSER Worldwide 570 NEWARK Americas 572 RS COMPONENTS Worldwide 5 TAYLOR Americas 59	$0.62 each at 1K+ pcs	rail of 95
LP2997MR/NOPB LP2997MR RoHS Status	PSOP	Full production Lead Time: 6 weeks	Distributor Region Qty ARROW Worldwide 639 AVNET-EM Worldwide 168 DIGI-KEY Worldwide 3362 FARNELL Europe and Asia 1008 MOUSER Worldwide 179 NEWARK Americas 393 RS COMPONENTS Worldwide 5 TAYLOR Americas 5209	$0.62 each at 1K+ pcs	rail of 95
LP2997MRX/NOPB LP2997MRX RoHS Status	PSOP	Full production Lead Time: 6 weeks	Distributor Region Qty AITG Asia Pacific 1001 ARROW Worldwide 8 AVNET-EM Worldwide 5000 DIGI-KEY Worldwide 0 MOUSER Worldwide 1543 TAYLOR Americas 8 TECHMOSA Asia Pacific 5000	$0.62 each at 1K+ pcs	reel of 2500
LP2997MX/NOPB LP2997MX RoHS Status	SOIC NARROW	Full production Lead Time: 6 weeks	Distributor Region Qty ARROW Worldwide 2500 AVNET-EM Worldwide 5000 DIGI-KEY Worldwide 0 MOUSER Worldwide 2250 TAYLOR Americas 2500	$0.62 each at 1K+ pcs	reel of 2500

All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/en/packaging/leadfree.html.

Moisture Sensitivity Level Data for LP2997.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

National's certificate of product compliance for LP2997 is located at RoHS Status.

Part Number(s) (NSID)	Weight (milligrams)	Type	Pins	MSL Rating	Peak Reflow	RoHS Status	CAD Symbols	Models	Package Marking Format
LP2997M/NOPB LP2997M	69.761 70.001	SOIC NARROW	8	1 1	260 235	Detail	Download	N/A	NSZXTT L2997 M
LP2997MR/NOPB LP2997MR	72.782 73.003	PSOP	8	3 3	260 260	Detail	Download	N/A	NSXYTT L2997 MR
LP2997MRX/NOPB LP2997MRX	72.782 73.003	PSOP	8	3 3	260 260	Detail	Download	N/A	NSXYTT L2997 MR
LP2997MX/NOPB LP2997MX	69.761 70.001	SOIC NARROW	8	1 1	260 235	Detail	Download	N/A	NSZXTT L2997 M

All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/en/packaging/leadfree.html.

Moisture Sensitivity Level Data for LP2997.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

National's certificate of product compliance for LP2997 is located at RoHS Status.

CAD Symbols and Models Download LP2997 CAD Symbols

Models N/A

Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
LP2997M	CS065	2	47473	43	0	5527000	1	1568301341
LP2997MR	CS065	2	47473	43	0	5527000	1	1568301341
LP2997MRX	CS065	2	47473	43	0	5527000	1	1568301341
LP2997MX	CS065	2	47473	43	0	5527000	1	1568301341

Note: The Early Failure Rates (EFR) were calculated as point estimate PPM based on rejects and sample size for EFR. The Long Term Failure Rates were calculated at 60% confidence using the Arrhenius equation at 0.7eV activation energy and derating the assumed stress temperature of 150°C to an application temperature of 55°C.

For more information on Reliability Metrics, please click here.

All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/en/packaging/leadfree.html.

Moisture Sensitivity Level Data for LP2997.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

National's certificate of product compliance for LP2997 is located at RoHS Status.