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Texas Instruments LP2995MX
- Part No.:
- LP2995MX
- Manufacturer:
- Texas Instruments
- Category:
- Power Management - Specialized
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LP2995MX.pdf
- Description:
- IC REGULATOR DDR TERM 8-SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,948
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Product details
Overview
LP2995MX from Texas Instruments is a linear DDR termination regulator designed for SSTL-2 and SSTL-3 bus termination in DDR-SDRAM systems. It sources and sinks up to ±1.5 A continuous current, regulates VTT to precisely VDDQ/2 (e.g., 1.25 V at VDDQ = 2.5 V), and provides a buffered VREF output with ±15 mV offset. It operates from AVIN/PVIN = 2.2–5.5 V and supports JEDEC-compliant memory interface termination.
For engineers reviewing the LP2995MX datasheet, LP2995MX pinout, LP2995MX application, or LP2995MX equivalent, this page delivers verified package mapping (SOIC-8), confirmed dual-sourcing capability (±3 A transient), validated VSENSE remote-sense functionality, and real-world DDR motherboard implementation constraints - all critical for DDR-2/3 power integrity design and BOM validation.
Technical Context
The LP2995MX integrates two high-speed op-amps: one for VREF generation (buffered VDDQ/2) and another for VTT regulation using VSENSE feedback. Its output stage prevents shoot-through while delivering bidirectional current, enabling precise tracking of VTT to VREF across load transients.
It uses internal 50 kΩ resistor dividers to derive VREF and VTT from VDDQ, supporting scalable reference voltages (e.g., VDDQ × 0.45 via external series resistor). The device requires no external resistors for basic SSTL-2 operation and accepts AVIN and PVIN tied together at 2.5 V for optimal performance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VTT Output Voltage | 1.25 V nominal (VDDQ/2); tracks VDDQ input with ±15 mV offset - ensures JEDEC SSTL-2 compliance when VDDQ = 2.5 V. |
| Continuous Current | ±1.5 A sourcing/sinking - supports full DDR-SDRAM bus termination load under steady-state conditions. |
| Transient Current | ±3 A peak - handles fast DDR data line switching transients without droop exceeding specification limits. |
| VREF Output Impedance | 5 kΩ - enables stable reference delivery to high-impedance chipset and memory inputs with minimal loading error. |
| Quiescent Current | 250–400 µA - low standby power draw critical for system-level energy efficiency in memory subsystems. |
| Input Voltage Range | AVIN/PVIN = 2.2–5.5 V - accommodates 2.5 V, 3.3 V, and 5 V rails while maintaining regulation integrity. |
| Thermal Resistance (θJA) | 151 °C/W (SOIC-8, JEDEC board) - defines maximum power dissipation before junction temperature exceeds 125 °C. |
Pinout & Package
LP2995MX is packaged in an 8-pin SOIC (D0008A) with gull-wing leads and 1.27 mm pitch. The exposed thermal pad is absent - thermal management relies on PCB copper area and airflow. Pin 1 is marked by a beveled corner or dot.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | NC | No internal connection; usable for thermal vias or routing clearance only. |
| 2 | GND | Power and signal ground reference; must connect to low-impedance ground plane with multiple vias. |
| 3 | VSENSE | Remote sense input for VTT regulation; connects to midpoint of termination bus to compensate for IR drop. |
| 4 | VREF | Buffered VDDQ/2 reference output; supplies timing reference to Northbridge and DDR DIMM; bypass with 0.01–0.1 µF ceramic capacitor. |
| 5 | VDDQ | Reference input voltage; sets VREF and VTT scaling (e.g., 2.5 V → 1.25 V); should be connected remotely at DIMM for accuracy. |
| 6 | AVIN | Analog supply for control circuitry and VREF buffer; tied to PVIN for SSTL-2 operation. |
| 7 | PVIN | Power supply for VTT output stage; tied to AVIN for 2.5 V rail use; requires local 10–50 µF input capacitance. |
| 8 | VTT | Regulated termination output; sources/sinks current to DDR stubs; connects directly to termination resistors (e.g., 25 Ω). |
Key Features
| Feature | Design Value |
|---|---|
| Integrated VREF buffer | Delivers stable, low-impedance VDDQ/2 reference to chipset and memory without external components - eliminates reference drift due to trace resistance. |
| VSENSE remote sensing | Enables <1 % load regulation error across long DDR buses by closing feedback loop at termination midpoint - critical for multi-DIMM motherboards. |
| Bidirectional output stage | Prevents shoot-through while supporting ±1.5 A continuous and ±3 A transient current - meets DDR-SDRAM dynamic termination requirements. |
| No external resistors required | Internal 50 kΩ divider sets VTT = VDDQ/2 out-of-box - reduces BOM count and layout complexity for SSTL-2 designs. |
| Multiple package options | SOIC-8 (LP2995MX/NOPB), SO PowerPAD-8 (LP2995MR/NOPB), and WQFN-16 (LP2995LQ/NOPB) - allows thermal and space optimization per application. |
Applications
| DDR-2 Memory Subsystem | SSTL-2 Compliant Motherboard |
|---|---|
Use Scenario: Termination of parallel DDR-2 data/address/control lines on desktop/server motherboards with dual-channel memory interfaces. IC Role / Device Role / Timing Role: Provides regulated VTT and VREF to satisfy JEDEC SSTL-2 Class II single-parallel termination requirements. Use Value: Maintains signal integrity at 400–800 MT/s by eliminating reflections; VSENSE placement at bus center ensures <±10 mV VTT variation across 12-inch traces. |
Use Scenario: DDR-2 SDRAM module termination in industrial embedded controllers requiring long-term component availability and RoHS compliance. IC Role / Device Role / Timing Role: Linear regulator generating precise 1.25 V termination voltage referenced to 2.5 V VDDQ rail. Use Value: Eliminates need for external resistor dividers or trimming; LP2995MX's SOIC-8 package supports legacy PCB rework and automated assembly. |
| SSTL-3 Level Translation | DDR-3 Reference Distribution |
Use Scenario: Adapting LP2995MX for SSTL-3 termination by adding 11.1 kΩ series resistor on VDDQ to scale VREF/VTT to VDDQ × 0.45 (e.g., 1.35 V at 3.0 V VDDQ). IC Role / Device Role / Timing Role: Programmable termination regulator leveraging internal resistor divider flexibility. Use Value: Enables reuse of same IC across SSTL-2 and SSTL-3 platforms with minimal BOM change - reduces qualification overhead. |
Use Scenario: Providing synchronized VREF to both memory controller and DDR-3 DIMMs in telecom baseband processing units. IC Role / Device Role / Timing Role: Buffered reference source with 5 kΩ output impedance and ±15 mV accuracy over 0–125 °C. Use Value: Ensures setup/hold timing margins remain intact despite VDDQ rail noise; VREF bypassing minimizes jitter coupling into clock paths. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar DDR termination regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LP2995LQ/NOPB | WQFN-16 package; θJA = 51 °C/W vs. SOIC-8's 151 °C/W; identical electrical specs and pinout mapping. | Superior thermal performance for high-density, airflow-limited DDR modules; requires 4-layer PCB with thermal vias under DAP. | Select LP2995LQ/NOPB when board space is constrained and thermal headroom is limited; LP2995MX remains optimal for cost-sensitive, through-hole-compatible designs. |
| TPS51100DGQR | Switching architecture; 95 % efficiency vs. LP2995MX's linear topology; ±3 A continuous; requires external inductor/capacitors. | Lower power dissipation in high-current DDR-3 systems; introduces switching noise requiring careful filtering near memory clocks. | Choose TPS51100DGQR for >2 A average loads where thermal budget is critical; LP2995MX preferred for noise-sensitive, low-to-moderate current DDR-2 applications. |
Compared with LP2995LQ/NOPB, LP2995MX trades thermal performance for lower assembly cost and legacy compatibility; versus TPS51100DGQR, it avoids EMI concerns but dissipates more heat - making LP2995MX the default choice for proven, low-noise DDR-2 termination where board area and cost are prioritized.
Availability
LP2995MX is available at Aetrix Electronics and suitable for DDR-2 memory subsystems, SSTL-2 motherboard designs, and industrial embedded controllers requiring stable component supply, RoHS compliance, and long-lifecycle support.
Supply support for LP2995MX 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 logic solutions, with decades of DDR interface expertise and JEDEC-compliant product development.
The LP2995MX belongs to TI's DDR termination regulator product line, engineered specifically to meet SSTL-2/SSTL-3 specifications for DDR-SDRAM bus termination - emphasizing precision tracking, bidirectional current handling, and system-level noise immunity.
FAQ
What is the primary function of the LP2995MX in a DDR memory system?
The LP2995MX serves as a linear termination regulator that generates and maintains the VTT termination voltage (VDDQ/2) and a buffered VREF reference for DDR-SDRAM interfaces. It actively sources and sinks current to stabilize the memory bus during high-speed data transitions, directly supporting JEDEC SSTL-2 and SSTL-3 compliance. The LP2995MX achieves this without external resistors in standard configurations and uses VSENSE for accurate remote regulation - ensuring signal integrity across the entire DDR bus.
Can the LP2995MX be used for SSTL-3 applications, and how is the reference voltage adjusted?
Yes, the LP2995MX supports SSTL-3 by modifying the internal VDDQ-based reference scaling. Adding an 11.1 kΩ resistor in series with the VDDQ pin changes the effective divider ratio from VDDQ × 0.5 to VDDQ × 0.45 - yielding 1.35 V VREF/VTT at a 3.0 V VDDQ rail. This adjustment preserves LP2995MX's core regulation architecture while meeting SSTL-3 voltage thresholds. No changes to VTT output stage or VSENSE functionality are required.
What is the role of the VSENSE pin on the LP2995MX, and what happens if it is left unconnected?
The VSENSE pin enables remote-sense feedback for VTT regulation, allowing the LP2995MX to monitor voltage at the DDR bus midpoint and compensate for IR drop along PCB traces. If VSENSE is left unconnected, TI documentation explicitly requires tying it to VTT - otherwise regulation accuracy degrades significantly, especially on boards with >4-inch trace lengths. Failure to connect VSENSE correctly results in >50 mV VTT error at far-end stubs, violating SSTL-2 tolerance limits.
How does the LP2995MX handle thermal limitations in continuous high-current operation?
The LP2995MX's thermal performance depends on package and PCB layout: its SOIC-8 version has θJA = 151 °C/W on a JEDEC board. At 1.5 A continuous load with 2.5 V input, power dissipation reaches ~1.1 W - raising junction temperature by ~166 °C above ambient, exceeding the 125 °C limit. Therefore, derating is mandatory: operation above 0.8 A requires airflow, thermal vias, or reduced ambient temperature. The LP2995MX datasheet provides θJA vs. airflow curves to guide safe thermal design.
Is the LP2995MX pin-compatible with other members of the LP2995 family, such as LP2995LQ/NOPB or LP2995MR/NOPB?
No - the LP2995MX (SOIC-8) is not pin-compatible with LP2995LQ/NOPB (WQFN-16) or LP2995MR/NOPB (SO PowerPAD-8). While all share identical functional pin names (VTT, VREF, VSENSE, etc.), their pin counts, layouts, and terminal assignments differ fundamentally: SOIC-8 has 8 pins in D0008A outline; WQFN-16 uses NHP outline with 16 pins including thermal pad connections; SO PowerPAD-8 adds exposed pad terminals. Board redesign is required for package substitution - only electrical behavior and reference design principles are consistent across the LP2995 family.
LP2995MX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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
LP2995MX FAQ
1.How can I place an order for LP2995MX through Aetrix?
Please submit a Request for Quotation (RFQ) for LP2995MX 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 LP2995MX reliable?
The price and inventory of LP2995MX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP2995MX is usually 5 days.
3.What payment methods are accepted for LP2995MX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP2995MX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP2995MX?
LP2995MX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP2995MX 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 LP2995MX?
For technical support, including LP2995MX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP2995MX requirements.
6.How does Aetrix verify that LP2995MX is sourced from the original manufacturer or authorized distributors?
All LP2995MX 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 LP2995MX meets industry standards.
7.What is the process for return or replacement of LP2995MX?
All LP2995MX units undergo pre-shipment inspection (PSI). If there is an issue with LP2995MX, 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 LP2995MX part is unused and in its original packaging.
Return procedure for LP2995MX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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