LP2997 DDR-II Termination Regulator
| LM2744 | Switching Termination Regulator |
| LP2996 | DDR-I And DDR-II Linear Termination Regulator |
LP2997 特性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
LP2997 概述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.
LP2997 应用Applications
- DDR-II Termination Voltage
- SSTL-18 Termination
|
|
|
|---|
LP2997 性能参数Parametrics
| Paramaters / Values | LP2997 | LM2744 | LP2996 |
|---|---|---|---|
| Input Min Voltage | 2.2 Volt | 1 Volt | 1.5 Volt |
| Input Max Voltage | 5.5 Volt | 16 Volt | 5.5 Volt |
| Output Current | 500 mA | 20000 mA | 1500 mA |
| Standards | DDR2 | DDR2, DDR | DDR2, DDR |
| External Components | 3 | 23 | 4 |
| Independent Power/Analog Rails | Yes | Yes | No |
| On/Off Pin | Yes | Yes | Yes |
| Reference Output | 1.25 Volt | 1.25 Volt | |
| Thermal Protection | Yes | No | Yes |
| Special Features | Suspend to RAM shutdown | External Vref version of LM2743 for ultra-high accuracy; Tracking; Sequencing | Suspend to RAM shutdown |
| PowerGood / Error Flag | No | Yes | No |
| Quiescent Current | 0.32 mA | 1.5 mA | 0.32 mA |
| RegType | LDO | Switching Controller | LDO |
| Temperature Min | 0 deg C | -40 deg C | 0 deg C |
| Temperature Max | 125 deg C | 125 deg C | 125 deg C |
LP2997 芯片订购型号Order
| Part Number(s) (NSID) | Top View | Availability | Budgetary Pricing | Pack Size |
|---|---|---|---|---|
| LP2997M/NOPB
LP2997M |
SOIC NARROW |
Full production Lead Time: 8 weeks | $0.62 each at 1K+ pcs | rail
of
95
 |
| LP2997MR/NOPB
LP2997MR |
PSOP |
Full production Lead Time: 8 weeks | $0.62 each at 1K+ pcs | rail
of
95
|
| LP2997MRX/NOPB
LP2997MRX |
PSOP |
Full production Lead Time: 8 weeks | $0.62 each at 1K+ pcs | reel
of
2500
 |
| LP2997MX/NOPB
LP2997MX |
SOIC NARROW |
Full production Lead Time: 8 weeks | $0.62 each at 1K+ pcs | reel
of
2500
|
LP2997 封装Packaging
| 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 | LP2997M/NOPB LP2997M |
N/A | NSZXTT L2997 M |
| LP2997MR/NOPB LP2997MR |
72.782 73.003 |
PSOP |
8 | 3 3 |
260 260 |
Detail | LP2997MR/NOPB LP2997MR |
N/A | NSXYTT L2997 MR |
| LP2997MRX/NOPB LP2997MRX |
72.782 73.003 |
PSOP |
8 | 3 3 |
260 260 |
Detail | LP2997MRX/NOPB LP2997MRX |
N/A | NSXYTT L2997 MR |
| LP2997MX/NOPB LP2997MX |
69.761 70.001 |
SOIC NARROW |
8 | 1 1 |
260 235 |
Detail | LP2997MX/NOPB LP2997MX |
N/A | NSZXTT L2997 M |
LP2997 标准体系参考Reliability Metrics
| Part Number | Process | EFR Reject | EFR Sample Size | PPM | LTA Rejects | LTA Device Hours | FITS | MTTF (Hours) |
|---|---|---|---|---|---|---|---|---|
| LP2997M | CS065 | 2 | 38968 | 52 | 0 | 4402000 | 1 | 1249079519 |
| LP2997MR | CS065 | 2 | 38968 | 52 | 0 | 4402000 | 1 | 1249079519 |
| LP2997MRX | CS065 | 2 | 38968 | 52 | 0 | 4402000 | 1 | 1249079519 |
| LP2997MX | CS065 | 2 | 38968 | 52 | 0 | 4402000 | 1 | 1249079519 |