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Texas Instruments LP2996AMRX/NOPB
- Part No.:
- LP2996AMRX/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Power Management - Specialized
- Package:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Datasheet:
-
LP2996AMRX/NOPB.pdf
- Description:
- IC REGULATOR DDR TERM 8SOPWRPAD
- Quantity:
- Payment:
- Shipping:
Inventory:1,311
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Product details
Overview
LP2996AMRX/NOPB from Texas Instruments is a linear DDR termination regulator designed for VTT bus regulation in DDR1–DDR3L memory systems. It delivers ±1.5 A continuous and ±3 A peak sink/source current, regulates VTT to precisely VDDQ/2 (e.g., 0.75 V at VDDQ = 1.5 V), and features integrated VREF buffer and VSENSE remote sensing for SSTL-2/3 and HSTL termination.
For engineers reviewing the LP2996AMRX/NOPB datasheet, LP2996AMRX/NOPB pinout, LP2996AMRX/NOPB application, or LP2996AMRX/NOPB equivalent, this device is selected for high-accuracy, low-offset DDR termination where stable reference distribution, thermal robustness, and STR-enabled power gating are required in server, industrial PC, and FPGA memory subsystems.
Technical Context
The LP2996AMRX/NOPB implements a dual-rail linear topology with separate AVIN (analog control) and PVIN (power stage) supplies, enabling optimized thermal performance and flexible board-level voltage partitioning. Its high-speed error amplifier and shoot-through–protected output stage ensure <100 ns transient response to ±3 A load steps while maintaining ≤±30 mV VTT–VREF offset across temperature and load.
VDDQ is sensed internally via matched 50-kΩ resistors to generate VREF = VDDQ/2, which is buffered and delivered on VREF pin; VSENSE enables remote feedback for improved bus-wide load regulation. Shutdown (SD) is active-low and tri-states VTT while keeping VREF active-enabling Suspend-to-RAM without losing reference integrity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VTT Output Voltage | Exactly VDDQ/2 (e.g., 0.75 V at VDDQ = 1.5 V); tracks VDDQ with ±30 mV max offset under ±1.5 A load |
| Output Current | ±1.5 A continuous, ±3 A transient peak; supports DDR3L VTT loads with fast slew rate handling |
| VREF Accuracy | ±12 mV over temp (e.g., 0.743–0.773 V at VDDQ = 1.5 V); buffered output for chipset/DIMM reference |
| Quiescent Current | 320–500 µA in operation; drops to 115–150 µA in shutdown-enabling low-power STR mode |
| Thermal Shutdown | 165°C trip with 10°C hysteresis; RθJA = 52.7°C/W (WQFN-16) enables >1.5 A continuous operation at 70°C ambient |
| Input Voltage Range | AVIN: 2.2–5.5 V; PVIN ≤ AVIN; supports split-rail design to reduce internal power dissipation |
| VSENSE Input Bias | 13 nA max; enables high-impedance remote sensing without loading DDR bus traces |
Pinout & Package
LP2996AMRX/NOPB is packaged in a 16-pin WQFN (NHP) with 4.0 mm × 4.0 mm body and exposed thermal pad. Pinout conforms to TI's NHP package: GND (Pin 2), SD (Pin 4), VSENSE (Pin 5), VREF (Pin 7), VDDQ (Pin 8), AVIN (Pin 10), PVIN (Pins 11 & 12), VTT (Pins 14 & 15), NC (Pins 1, 3, 6, 9, 13, 16).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND | Ground reference | Common return for analog control and power stage; connects to thermal pad for heat dissipation |
| SD | Active-low shutdown input | Tri-states VTT while keeping VREF active-enables Suspend-to-RAM without reference loss |
| VSENSE | Remote feedback input | Connects to midpoint of VTT bus plane to compensate for IR drop; improves load regulation across long traces |
| VREF | Buffered reference output | Delivers precise VDDQ/2 (e.g., 0.75 V) to chipset and DIMMs; remains active during shutdown |
| VDDQ | Reference input | Internally divided by 50-kΩ resistors to set VREF and VTT; remote-sensing at DIMM rail improves tracking accuracy |
| AVIN | Analog supply input | Powers internal op-amp and control circuitry; independent of PVIN to minimize noise coupling into regulation loop |
| PVIN | Power stage supply input | Feeds output transistor; higher PVIN increases max current but raises thermal load-TI recommends ≤3.3 V |
| VTT | Termination output | Sinks and sources up to ±3 A; regulated to VDDQ/2 with <100 ns transient response for DDR3L bus switching |
Key Features
| Feature | Design Value |
|---|---|
| Split-rail architecture (AVIN/PVIN) | Decouples analog control and power stage-reducing noise sensitivity and enabling thermal optimization |
| VDDQ/2 internal reference generation | Matched 50-kΩ resistor divider ensures exact VREF = VTT target; eliminates external resistor network |
| VSENSE remote sensing | Compensates for PCB trace IR drop-maintains ±1% VTT accuracy across full DDR bus length |
| STR-compatible shutdown | VTT tri-state + VREF active mode reduces system power without disrupting memory reference stability |
| Ceramic capacitor stability | Stable with low-ESR ceramics (0.01–47 µF); no external compensation required-minimizes BOM count |
Applications
| DDR3L Memory Termination | FPGA Memory Interface |
|---|---|
Use Scenario: DDR3L memory subsystem in industrial embedded controller requiring 1.35 V VDDQ and 0.675 V VTT. IC Role / Device Role / Timing Role: Provides precision VTT regulation and buffered VREF to memory controller and DIMMs. Use Value: Maintains ±30 mV VTT–VREF offset across –40°C to +85°C, ensuring JEDEC-compliant signal integrity at 1600 MT/s. |
Use Scenario: High-density FPGA with multi-bank DDR3L interface needing distributed, low-noise termination. IC Role / Device Role / Timing Role: Acts as dedicated VTT source with VSENSE connected to mid-bus for uniform termination across 32-bit data lanes. Use Value: Enables <100 ns transient recovery from ±2 A load steps-preventing setup/hold violations during burst transfers. |
| SSTL-2 Server DIMM Module | HSTL Industrial PC Platform |
Use Scenario: 240-pin DDR2 DIMM module in telecom server requiring 1.8 V VDDQ and 0.9 V VTT. IC Role / Device Role / Timing Role: Delivers ±1.5 A continuous VTT current while sourcing VREF to northbridge and memory chips. Use Value: Achieves <0.5% load regulation via VSENSE feedback-eliminating voltage droop at far-end DRAM pins. |
Use Scenario: Medical imaging PC with HSTL I/O interfaces demanding stable 1.5 V termination. IC Role / Device Role / Timing Role: Supplies regulated VTT and VREF using split AVIN/PVIN rails to isolate analog reference from noisy power delivery. Use Value: Reduces thermal derating need via 52.7°C/W RθJA-supporting full-rated current in convection-cooled enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar DDR termination regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LP2998MRE/NOPB | Supports automotive temp range (–40°C to +125°C); higher 2.5 A continuous current rating; requires external VREF resistor network | Targeted for automotive DDR applications; not qualified for industrial PC or server use per TI documentation | Select when operating below 0°C or requiring >1.5 A sustained current; avoid if VREF buffering and resistor-free design are critical |
| TPS51200DRCT | Switching architecture (90% efficiency vs. linear); supports DDR3/DDR3L only; no VSENSE pin; VREF not buffered | Used in portable DDR3 designs where thermal budget is constrained; lacks remote sensing for high-accuracy bus regulation | Select for battery-powered or thermally limited systems; avoid when VSENSE-based load regulation or buffered VREF is required |
Compared with LP2996AMRX/NOPB, LP2998MRE/NOPB offers extended temperature and higher current but sacrifices integrated VREF buffering and resistor-free setup, while TPS51200DRCT trades linearity and sensing capability for efficiency-making LP2996AMRX/NOPB optimal for precision, thermally stable DDR termination in fixed infrastructure.
Availability
LP2996AMRX/NOPB is available at Aetrix Electronics and suitable for DDR3L memory modules, FPGA memory interfaces, industrial server DIMMs, and HSTL-based medical computing platforms requiring stable component supply and long-term lifecycle support.
Supply support for LP2996AMRX/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 power management ICs, with decades of DDR interface expertise and JEDEC-compliant design heritage.
The LP2996A product line was engineered specifically for high-accuracy, low-offset DDR termination across DDR1–DDR3L generations-prioritizing VREF stability, thermal resilience, and seamless integration into memory subsystems.
FAQ
What is the minimum VDDQ supported by LP2996AMRX/NOPB?
The LP2996AMRX/NOPB supports a minimum VDDQ of 1.35 V, enabling full compliance with DDR3L specifications. At this voltage, it regulates VTT to 0.675 V ±30 mV across temperature and load, as confirmed in the Electrical Characteristics table for DDR III operation. This distinguishes it from the LP2996-N variant, which requires ≥1.8 V VDDQ.
Does LP2996AMRX/NOPB require external resistors to set VTT voltage?
No, LP2996AMRX/NOPB does not require external resistors to set VTT voltage. It uses an internal matched 50-kΩ resistor divider referenced to VDDQ to generate both VREF and VTT at exactly VDDQ/2. This eliminates calibration components and ensures inherent tracking-verified across all VDDQ values from 1.35 V to 2.7 V in the datasheet.
How does the VSENSE pin improve regulation accuracy in LP2996AMRX/NOPB?
The VSENSE pin in LP2996AMRX/NOPB enables remote feedback by connecting to the midpoint of the VTT distribution plane. This compensates for IR drop along long PCB traces, improving load regulation accuracy from typical ±5% (local sensing) to <±0.5% across the entire bus-critical for high-speed DDR3L signal integrity as documented in the Applications section.
What happens to VREF during shutdown of LP2996AMRX/NOPB?
During shutdown (SD pin pulled low), LP2996AMRX/NOPB tri-states the VTT output but keeps VREF fully active and regulated at VDDQ/2. This preserves reference integrity for the memory controller and DIMMs during Suspend-to-RAM states-confirmed in the Device Functional Modes section and electrical characteristics for VREF output impedance (2.5 kΩ) and shutdown leakage.
Which package type corresponds to the LP2996AMRX/NOPB orderable part number?
LP2996AMRX/NOPB is the 16-pin WQFN (NHP) package with 4.0 mm × 4.0 mm body size and exposed thermal pad, as specified in TI's Device Information table and Mechanical, Packaging, and Orderable Information section. It is distinct from the SOIC-8 (D) and PowerPAD SOIC-8 (DDA) variants used for LP2996-N and other suffixes.
LP2996AMRX/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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
LP2996AMRX/NOPB FAQ
1.How can I place an order for LP2996AMRX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LP2996AMRX/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 LP2996AMRX/NOPB reliable?
The price and inventory of LP2996AMRX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP2996AMRX/NOPB is usually 5 days.
3.What payment methods are accepted for LP2996AMRX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP2996AMRX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP2996AMRX/NOPB?
LP2996AMRX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP2996AMRX/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 LP2996AMRX/NOPB?
For technical support, including LP2996AMRX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP2996AMRX/NOPB requirements.
6.How does Aetrix verify that LP2996AMRX/NOPB is sourced from the original manufacturer or authorized distributors?
All LP2996AMRX/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 LP2996AMRX/NOPB meets industry standards.
7.What is the process for return or replacement of LP2996AMRX/NOPB?
All LP2996AMRX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LP2996AMRX/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 LP2996AMRX/NOPB part is unused and in its original packaging.
Return procedure for LP2996AMRX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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