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Texas Instruments LP2996MR/NOPB
- Part No.:
- LP2996MR/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Power Management - Specialized
- Package:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Datasheet:
-
LP2996MR/NOPB.pdf
- Description:
- IC DDR TERMINATION REG 8SOPWRPAD
- Quantity:
- Payment:
- Shipping:
Inventory:161
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Product details
Overview
LP2996MR/NOPB from Texas Instruments is a linear DDR termination regulator designed for VTT bus regulation in DDR1–DDR3L memory systems. It sources and sinks up to ±3 A transient current, maintains VTT = VDDQ/2 with ≤30 mV offset, and delivers 1.5-A continuous output while supporting SSTL-2/3 and HSTL termination in industrial PC and FPGA platforms.
For engineers reviewing the LP2996MR/NOPB datasheet, LP2996MR/NOPB pinout, LP2996MR/NOPB application, or LP2996MR/NOPB equivalent, this page provides verified electrical specs, thermal derating guidance, remote sense (VSENSE) implementation details, STR-mode shutdown behavior, and validated alternatives for DDR memory power integrity design.
Technical Context
The LP2996MR/NOPB implements a high-speed op-amp-based linear regulator with split-rail architecture: AVIN powers analog control circuitry, PVIN supplies the output stage, and VDDQ sets the internal reference via dual 50-kΩ resistors. This enables precise VTT = VDDQ/2 tracking across temperature and load.
It features active-low SD pin for Suspend-to-RAM mode (VTT tri-stated, VREF active), VSENSE for remote load regulation, and thermal shutdown at 165°C with 10°C hysteresis. The device supports DDR3L down to 1.35 V VDDQ and operates from AVIN = 2.2–5.5 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VTT Output Voltage | VDDQ/2 (e.g., 0.75 V at VDDQ = 1.5 V); tracks VDDQ precisely with ≤±30 mV offset under ±1.5 A load |
| Output Current | 1.5-A continuous, ±3-A transient peak; limited by thermal dissipation and PVIN–VTT voltage drop |
| VREF Output | Buffered VDDQ/2 reference (e.g., 0.75 V at VDDQ = 1.5 V); remains active during shutdown for chipset/DIMM reference |
| Quiescent Current | 320–500 µA in normal operation; drops to 115–150 µA in shutdown mode |
| Thermal Shutdown | Triggers at 165°C junction temperature with 10°C hysteresis; forces VTT tri-state while preserving VREF |
| VSENSE Input | 13-nA bias current; enables remote sensing at bus midpoint to correct IR drop across long VTT planes |
| Input Voltage Range | AVIN = 2.2–5.5 V; PVIN ≤ AVIN; VDDQ ≤ min(6 V, 2×(AVIN – 1) V) |
Pinout & Package
LP2996MR/NOPB is packaged in an 8-pin SOIC (D package) with exposed thermal pad (PowerPAD), nominal body size 4.90 mm × 3.90 mm. Pin 1 is GND; pin 8 is VTT; pin 2 is SD; pin 3 is VSENSE; pin 4 is VREF; pin 5 is VDDQ; pin 6 is AVIN; pin 7 is PVIN.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND | Ground reference | Common return for analog control, power stage, and sense circuitry; connects to thermal pad |
| VTT | Regulated output | Sources/sinks DDR bus termination current; tri-states during SD assertion |
| SD | Shutdown control | Active-low input; pulls VTT high-impedance while keeping VREF active for STR mode |
| VSENSE | Remote feedback | Compensates for IR drop on VTT plane; must connect to bus midpoint or directly to VTT if unused |
| VREF | Reference output | Buffered VDDQ/2 for chipset and DIMMs; remains powered during shutdown |
| VDDQ | Reference input | Defines VTT target (VDDQ/2); internally divided by two 50-kΩ resistors; remote-sense recommended |
| AVIN | Analog supply | Powers internal op-amp, error amplifier, and logic; independent of PVIN for thermal optimization |
| PVIN | Power input | Supplies output stage; higher PVIN increases max current but raises thermal load; TI recommends ≤3.3 V |
Key Features
| Feature | Design Value |
|---|---|
| Split-rail architecture | Separates AVIN (analog control) and PVIN (power stage) to minimize thermal coupling and enable flexible rail assignment |
| VDDQ/2 tracking | Internal 50-kΩ/50-kΩ resistor divider ensures VTT exactly equals half VDDQ without external components |
| Suspend-to-RAM support | Active-low SD pin disables VTT output while maintaining VREF, reducing system quiescent power during sleep states |
| Remote load regulation | VSENSE pin allows feedback from bus midpoint, correcting voltage drop across long PCB traces for uniform termination |
| Stable with ceramic capacitors | Designed for low-ESR ceramic bypassing; no external compensation required for stability |
Applications
| DDR Memory Termination | FPGA I/O Bank Termination |
|---|---|
Use Scenario: Regulating VTT for DDR3L DIMMs operating at 1.35 V VDDQ in industrial embedded controllers. IC Role / Device Role / Timing Role: Linear termination regulator providing bidirectional current to maintain VTT = 0.675 V with ±30 mV accuracy under ±0.5 A transients. Use Value: Eliminates need for external resistor dividers or trimming; VSENSE compensates for 50-mV IR drop across 2-inch VTT plane. |
Use Scenario: Supplying SSTL-2-compliant termination voltage to Xilinx Artix-7 FPGA I/O banks interfacing with DDR2 memory. IC Role / Device Role / Timing Role: Delivers stable 1.25 V VTT (at VDDQ = 2.5 V) with fast transient response to handle simultaneous I/O switching noise. Use Value: Maintains signal integrity at 400 MT/s data rates; VREF output directly feeds FPGA reference pins without additional buffering. |
| HSTL Bus Termination | Medical PC Memory Subsystem |
Use Scenario: Terminating high-speed HSTL Class I buses in test equipment requiring sub-100-ps edge fidelity. IC Role / Device Role / Timing Role: Provides low-noise, low-offset VTT = VDDQ/2 with <100 ns response to 2-A load steps. Use Value: Reduces timing skew between parallel data lines; VREF buffer drives multiple HSTL receivers with <2.5 kΩ output impedance. |
Use Scenario: Powering DDR3 termination in FDA-cleared medical imaging workstations with strict thermal and reliability requirements. IC Role / Device Role / Timing Role: Delivers 1.5-A continuous VTT at 0.75 V (VDDQ = 1.5 V) with thermal shutdown at 165°C and 10°C hysteresis. Use Value: Ensures fail-safe operation: VTT tri-states on overtemperature while VREF sustains memory controller reference during recovery. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar DDR termination regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LP2996N/NOPB | Minimum VDDQ = 1.8 V; supports DDR1/DDR2 only; not rated for DDR3/DDR3L | Cannot replace LP2996MR/NOPB in DDR3L designs requiring 1.35 V VDDQ | Select only for legacy DDR1/DDR2 systems where VDDQ ≥ 1.8 V and DDR3L compatibility is unnecessary |
| TPS51200DRCT | Switching architecture; higher efficiency; requires external inductor and compensation; supports DDR3/DDR3L | Introduces switching noise; unsuitable for noise-sensitive analog sections near memory bus | Choose when thermal budget is constrained and board space allows inductor placement; verify EMI impact on signal integrity |
Compared with LP2996N/NOPB, LP2996MR/NOPB extends VDDQ support down to 1.35 V for DDR3L compliance, while TPS51200DRCT trades linear simplicity for switching efficiency-requiring careful layout to avoid noise coupling into VTT-sensitive memory interfaces.
Availability
LP2996MR/NOPB is available at Aetrix Electronics and suitable for DDR3L memory termination, FPGA I/O bank regulation, and medical-grade embedded computing requiring stable component supply, JEDEC-compliant SSTL/HSTL support, and robust thermal management.
Supply support for LP2996MR/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 company specializing in analog, embedded processing, and power management ICs, with leadership in high-reliability interface and memory power solutions.
The LP2996MR/NOPB belongs to TI's DDR termination regulator product line, engineered specifically for JEDEC-compliant VTT generation in DDR1–DDR3L systems with emphasis on precision tracking, low noise, and STR-mode power savings.
FAQ
What is the minimum VDDQ voltage supported by the LP2996MR/NOPB?
The LP2996MR/NOPB supports DDR3L operation with a minimum VDDQ of 1.35 V, enabling VTT = 0.675 V regulation. This distinguishes it from the LP2996N/NOPB (min VDDQ = 1.8 V) and confirms its qualification for DDR3L memory subsystems. The device maintains ≤±30 mV VTT offset across temperature and load at this voltage.
How does the VSENSE pin improve termination accuracy in LP2996MR/NOPB designs?
The VSENSE pin on the LP2996MR/NOPB enables remote feedback from the center of the VTT distribution plane, compensating for IR drop across long PCB traces. When connected to the midpoint, it improves load regulation by up to 50 mV versus local sensing-critical for maintaining SSTL-2/3 voltage margins across multi-DIMM memory channels.
Does LP2996MR/NOPB remain functional during Suspend-to-RAM mode?
Yes. During Suspend-to-RAM mode (SD pin low), the LP2996MR/NOPB tri-states its VTT output but keeps VREF active and stable. This preserves the chipset and DIMM reference voltage while cutting VTT quiescent current to 115–150 µA-enabling low-power memory retention without reinitialization on wake-up.
What thermal considerations apply to LP2996MR/NOPB at 1.5-A continuous load?
At 1.5-A continuous load with PVIN = 3.3 V and VTT = 0.75 V, LP2996MR/NOPB dissipates ~3.8 W. With RθJA = 119.5°C/W (SOIC), junction temperature rise exceeds safe limits unless board-level thermal management (e.g., 2 oz copper, thermal vias to inner layers) is implemented. Derating to ≤1.0 A is recommended for unenhanced layouts.
Can LP2996MR/NOPB be used for HSTL Class I termination?
Yes. The LP2996MR/NOPB meets HSTL Class I requirements by delivering VTT = VDDQ/2 with fast transient response (<100 ns to 2-A step) and low output impedance. At VDDQ = 1.5 V, it regulates VTT = 0.75 V with ≤30 mV offset-within HSTL Class I tolerance-and supports bidirectional current for driver/receiver termination on high-speed buses.
LP2996MR/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Applications:
- DDR Terminator
- Current - Supply:
- 320µA
- Voltage - Supply:
- 2.2V ~ 5.5V
- Operating Temperature:
- 0°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO PowerPad
LP2996MR/NOPB FAQ
1.How can I place an order for LP2996MR/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LP2996MR/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 LP2996MR/NOPB reliable?
The price and inventory of LP2996MR/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP2996MR/NOPB is usually 5 days.
3.What payment methods are accepted for LP2996MR/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP2996MR/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP2996MR/NOPB?
LP2996MR/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP2996MR/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 LP2996MR/NOPB?
For technical support, including LP2996MR/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP2996MR/NOPB requirements.
6.How does Aetrix verify that LP2996MR/NOPB is sourced from the original manufacturer or authorized distributors?
All LP2996MR/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 LP2996MR/NOPB meets industry standards.
7.What is the process for return or replacement of LP2996MR/NOPB?
All LP2996MR/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LP2996MR/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 LP2996MR/NOPB part is unused and in its original packaging.
Return procedure for LP2996MR/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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