LP2998

The LP2998 linear regulator is designed to meet JEDEC SSTL-2 and JEDEC SSTL-18 specifications for termination of DDR1-SDRAM and 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 1.5A continuous current as required for DDR1-SDRAM termination, and 0.5A continuous current as required for DDR-II termination. The LP2998 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 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, while V_REF remains active. A power savings advantage can be obtained in this mode through lower quiescent current.

Reliability Metrics

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Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
LP2998MA	CS065	2	34108	59	0	3862000	1	1095853045
LP2998MAE	CS065	2	34108	59	0	3862000	1	1095853045
LP2998MAX	CS065	2	34108	59	0	3862000	1	1095853045
LP2998MR	CS065	2	34108	59	0	3862000	1	1095853045
LP2998MRE	CS065	2	34108	59	0	3862000	1	1095853045
LP2998MRX	CS065	2	34108	59	0	3862000	1	1095853045

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.

Application Notes

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Title	Size in Kbytes	Date
AN-1813: Application Note 1813 LP2998 Evaluation Board	975 Kbytes	10-Mar-08	Download

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More Application Notes

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Title	Size in Kbytes	Date
AN-1241: Application Note 1241 LP2995 Evaluation Board	373 Kbytes	25-Sep-02	Download
AN-1268: Application Note 1268 LP2996 Evaluation Board	67 Kbytes	5-Dec-02	Download
AN-1254: Application Note 1254 DDR-SDRAM Termination Simplified Using a Linear Regulator	49 Kbytes	1-Oct-02	Download

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