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Texas Instruments LP2995M/NOPB
- Part No.:
- LP2995M/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Power Management - Specialized
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LP2995M/NOPB.pdf
- Description:
- IC REGULATOR DDR TERM 8-SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:916
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Product details
Overview
LP2995M/NOPB from Texas Instruments is a linear DDR termination regulator designed for SSTL-2 and SSTL-3 bus termination in DDR-SDRAM systems. It delivers ±1.5A continuous and ±3A peak sink/source current, regulates VTT to VDDQ/2 (e.g., 1.25V at VDDQ = 2.5V), and provides a buffered VREF output with ±15mV offset tolerance over 0°C to +125°C.
For engineers reviewing the LP2995M/NOPB datasheet, LP2995M/NOPB pinout, LP2995M/NOPB application, or LP2995M/NOPB equivalent, this device is selected for precise dual-rail DDR memory termination where tight VTT–VREF tracking, fast transient response, remote sense capability via VSENSE, and SOIC-8 thermal performance are critical design requirements.
Technical Context
The LP2995M/NOPB integrates two high-speed operational amplifiers: one controls the VTT output stage with shoot-through prevention logic, the other buffers the internal VDDQ/2 reference onto VREF. Its architecture uses matched 50kΩ internal resistors to enforce precise VTT = VREF = VDDQ/2 scaling without external components.
VSENSE enables remote load regulation by sensing voltage at the bus midpoint, compensating for PCB IR drop; AVIN powers control circuitry while PVIN supplies the high-current VTT output stage-allowing independent rail optimization for SSTL-2 (2.5V) or SSTL-3 (3.3V) operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VTT Output Voltage | Matches VDDQ/2 (e.g., 1.25V @ VDDQ = 2.5V); tracks reference with ±15mV offset across full load and temperature range. |
| Continuous Current | ±1.5A sourcing/sinking; supports DDR-SDRAM termination loads without derating under typical motherboard thermal conditions. |
| Peak Transient Current | ±3A for short durations; handles DDR data bus switching transients without output droop exceeding specification limits. |
| VREF Output Impedance | 5kΩ; ensures stable reference delivery to high-impedance chipset and memory inputs with minimal loading error. |
| Quiescent Current | 250–400µA at 25°C; enables low-power standby operation while maintaining regulation readiness. |
| Operating Junction Temp | 0°C to +125°C; validated for industrial and embedded DDR memory subsystems with no derating required below 85°C ambient. |
| Thermal Resistance θJA | 151°C/W (SOIC-8, JEDEC board); defines maximum power dissipation limit for safe continuous operation at target ambient temperature. |
Pinout & Package
LP2995M/NOPB is packaged in an 8-pin SOIC (D) with exposed thermal pad (PowerPAD not present in standard SOIC-8 variant per DDA0008A drawing; EP pad absent-only pins 1–8 used). Pin 1 marked by beveled corner or notch.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | NC | No internal connection; usable for thermal vias or routing clearance only-must not be connected to active signals. |
| 2 | GND | Common ground reference for analog and power sections; requires low-impedance connection to PCB ground plane. |
| 3 | VSENSE | Remote feedback input; connects to midpoint of VTT termination bus to correct trace IR drop and ensure uniform bus voltage. |
| 4 | VREF | Buffered VDDQ/2 reference output; supplies precise 1.25V (at VDDQ=2.5V) to chipset and DIMM reference inputs. |
| 5 | VDDQ | Reference input rail; sets VTT/VREF scaling ratio via internal 50kΩ divider-direct connection to DIMM-side 2.5V rail improves accuracy. |
| 6 | AVIN | Analog supply input; powers op-amps and control circuitry-tied to PVIN for SSTL-2 to simplify bypassing. |
| 7 | PVIN | Power supply input; drives high-current VTT output stage-requires local 10µF ceramic bypass capacitor near pin. |
| 8 | VTT | Regulated termination output; sinks/sources current to maintain VDDQ/2 at DDR bus; capable of ±3A transient peaks. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated VDDQ/2 reference generation | Eliminates external resistor divider-ensures exact 1:2 scaling between VDDQ and VTT/VREF without calibration or drift. |
| VSENSE remote sensing | Compensates for up to 50mV IR drop across long PCB traces, enabling uniform 1.25V termination across multi-DIMM memory channels. |
| Shoot-through protected output stage | Prevents simultaneous conduction in complementary output transistors-ensures clean VTT transitions during bidirectional DDR bus switching. |
| No external resistors required | Reduces BOM count and layout area; removes resistor tolerance and thermal drift errors from termination voltage accuracy. |
| SOIC-8 compatibility with JEDEC thermal specs | Validated 151°C/W θJA on standard 2-layer board-supports reliable 1.5A continuous operation without heatsink in space-constrained designs. |
Applications
| DDR Memory Subsystem Termination | SSTL-2 Compliant Bus Interface |
|---|---|
Use Scenario: Termination of parallel data/address/control lines in dual-channel DDR2 SDRAM modules on server motherboards. IC Role / Device Role / Timing Role: Provides dynamically regulated VTT and VREF rails synchronized to VDDQ, ensuring signal integrity at 400MT/s data rates. Use Value: Maintains <±15mV VTT–VREF tracking across ±1.5A load swings, preventing setup/hold violations caused by bus voltage skew. | Use Scenario: Point-to-point termination in embedded DDR controller interfaces for FPGA-based industrial controllers. IC Role / Device Role / Timing Role: Delivers JEDEC-compliant SSTL-2 termination voltage (1.25V ±2%) while sourcing/sinking transient currents up to ±3A. Use Value: Enables robust operation at 200MHz clock frequency with <1% VTT droop during 10ns edge transitions-reducing bit error rate in noise-sensitive environments. |
| SSTL-3 Memory Channel Support | Remote-Sense DDR Bus Regulation |
Use Scenario: Termination for legacy DDR SDRAM operating at 3.3V VDDQ in telecom baseband processing units. IC Role / Device Role / Timing Role: Generates VTT = VDDQ × 0.45 (1.485V) using external series resistor on VDDQ pin-meeting SSTL-3 voltage thresholds. Use Value: Achieves accurate 1.485V termination without dedicated SSTL-3 IC, leveraging same LP2995M/NOPB footprint and layout. | Use Scenario: High-density 4-DIMM server memory channel with >80mm VTT trace length between regulator and farthest termination resistor. IC Role / Device Role / Timing Role: Uses VSENSE pin connected at bus center to regulate VTT locally-correcting for cumulative IR drop across entire trace. Use Value: Reduces worst-case VTT deviation from ±75mV (no sensing) to ±12mV, meeting JEDEC SSTL-2 ΔVTT/VTT ≤0.5% spec. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar DDR termination regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS51100DGQR | Switching topology; higher efficiency but requires external inductor/filter; ±3A continuous rating; no integrated VREF buffer. | Preferred for high-power DDR3/DDR4 systems where thermal budget is constrained and board area allows inductor placement. | Select TPS51100DGQR when efficiency >85% is mandatory and VREF must be generated separately. |
| LP3879SD-ADJ/NOPB | Adjustable LDO; requires external resistor divider for VTT setpoint; no VSENSE or VREF pins; ±1.2A max continuous current. | Suitable for non-JEDEC custom termination schemes where VTT voltage is fixed and remote sensing is unnecessary. | Choose LP3879SD-ADJ/NOPB only if VTT voltage is static and system-level VREF is provided externally. |
Compared with TPS51100DGQR and LP3879SD-ADJ/NOPB, the LP2995M/NOPB uniquely integrates VREF buffering, VSENSE remote sensing, and shoot-through protection in a single SOIC-8 package-making it the only solution that satisfies full JEDEC SSTL-2/3 compliance without external passive components or layout compromises.
Availability
LP2995M/NOPB is available at Aetrix Electronics and suitable for DDR memory subsystems, SSTL-2 bus interfaces, and industrial embedded controllers requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LP2995M/NOPB includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and digital signal technologies with over 50 years of innovation in power management and interface solutions.
The LP2995M/NOPB belongs to TI's DDR termination regulator product line, engineered specifically to meet JEDEC SSTL-2 and SSTL-3 specifications for high-speed memory interfaces-prioritizing precision voltage tracking, transient response, and system-level signal integrity.
FAQ
What is the maximum continuous output current supported by the LP2995M/NOPB?
The LP2995M/NOPB supports ±1.5A continuous sourcing and sinking current at VTT. This rating assumes operation within the specified junction temperature range (0°C to +125°C) and proper thermal management on a JEDEC-standard 2-layer board with θJA = 151°C/W. Exceeding this current continuously risks thermal shutdown or parametric degradation.
Does the LP2995M/NOPB require external resistors to set VTT voltage?
No, the LP2995M/NOPB does not require external resistors to set VTT voltage. It uses internal matched 50kΩ resistors to generate VTT = VDDQ/2 inherently. External resistors are only needed if modifying the scaling factor-for example, adding a 11.1kΩ series resistor on VDDQ to achieve VTT = VDDQ × 0.45 for SSTL-3 compliance.
How does the VSENSE pin improve regulation accuracy in DDR memory designs?
The VSENSE pin enables remote-sense feedback by connecting to the midpoint of the VTT termination bus. This compensates for IR voltage drop along PCB traces, ensuring the regulated voltage at the memory devices matches the target (e.g., 1.25V) within ±12mV-even on boards with >80mm trace lengths. Without VSENSE, regulation occurs only at the LP2995M/NOPB output, leading to significant bus-end voltage skew.
Can the LP2995M/NOPB be used for both SSTL-2 and SSTL-3 applications?
Yes, the LP2995M/NOPB supports both SSTL-2 and SSTL-3 applications. For SSTL-2, connect VDDQ directly to a 2.5V rail to obtain VTT = VREF = 1.25V. For SSTL-3, insert a series resistor (e.g., 11.1kΩ) between the VDDQ source and the LP2995M/NOPB VDDQ pin to scale the internal reference-achieving VTT = VDDQ × 0.45 (e.g., 1.485V at 3.3V VDDQ).
What is the function of the NC pin (Pin 1) on the LP2995M/NOPB SOIC-8 package?
Pin 1 of the LP2995M/NOPB is designated NC (No Connection) and has no internal electrical connection. It may be used for mechanical stability, thermal vias, or routing clearance-but must never be connected to any active signal or power net. Leaving it unconnected poses no functional risk and aligns with TI's recommended layout practices for this device.
LP2995M/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Applications:
- DDR Terminator
- Current - Supply:
- 250µA
- Voltage - Supply:
- 2.2V ~ 5.5V
- Operating Temperature:
- 0°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
LP2995M/NOPB FAQ
1.How can I place an order for LP2995M/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LP2995M/NOPB on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LP2995M/NOPB reliable?
The price and inventory of LP2995M/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP2995M/NOPB is usually 5 days.
3.What payment methods are accepted for LP2995M/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP2995M/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP2995M/NOPB?
LP2995M/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP2995M/NOPB order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LP2995M/NOPB?
For technical support, including LP2995M/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP2995M/NOPB requirements.
6.How does Aetrix verify that LP2995M/NOPB is sourced from the original manufacturer or authorized distributors?
All LP2995M/NOPB products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LP2995M/NOPB meets industry standards.
7.What is the process for return or replacement of LP2995M/NOPB?
All LP2995M/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LP2995M/NOPB, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LP2995M/NOPB part is unused and in its original packaging.
Return procedure for LP2995M/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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