Texas Instruments LP2995M

Overview

LP2995M 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 output current with ±3A transient capability, regulates VTT to VDDQ/2 (e.g., 1.25V at VDDQ = 2.5V), and provides a buffered VREF reference. It operates from AVIN/PVIN = 2.2–5.5V and supports SOIC-8 packaging.

For engineers reviewing the LP2995M datasheet, LP2995M pinout, LP2995M application, or LP2995M equivalent, this page delivers verified electrical specifications, JEDEC-compliant termination behavior, thermal derating guidance for SOIC-8, and validated alternatives for DDR memory power integrity design.

Technical Context

The LP2995M integrates two high-speed operational amplifiers: one controls the VTT output stage to source/sink current while preventing shoot-through, and the other buffers VREF as a precise VDDQ/2 reference. Its dual-supply architecture separates analog control (AVIN) from power delivery (PVIN) to minimize noise coupling.

VSENSE enables remote load regulation by sensing voltage at the bus midpoint, compensating for IR drop across long PCB traces. Internal 50kΩ resistor dividers set VTT and VREF tracking to VDDQ/2, with optional external resistor modification for SSTL-3 scaling (e.g., VDDQ × 0.45).

Key Specifications

Pinout & Package

LP2995M is packaged in an 8-pin SOIC (D) with exposed thermal pad (PowerPAD variant uses DDA package; standard LP2995M uses D package per TI packaging addendum). Pin 1 is marked with a notch or dot; EP (exposed pad) is internally connected to GND and must be soldered to PCB ground plane for thermal performance.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar DDR termination regulator applications.

Compared with LP2995MR/NOPB, the LP2995M offers lower cost and simpler layout but requires stricter thermal management; versus TPS7H1101AQPWPRQ1, LP2995M provides plug-and-play SSTL-2 support without external components but lacks automotive qualification.

Availability

LP2995M is available at Aetrix Electronics and suitable for DDR-SDRAM termination, SSTL-2 interface design, and memory subsystem power integrity applications requiring stable component supply and long-term industrial availability.

Supply support for LP2995M 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 digital signal technologies, with over 50 years of leadership in power management ICs.

The LP2995M belongs to TI's DDR termination regulator product line, engineered specifically to meet JEDEC SSTL-2/SSTL-3 specifications for DDR-SDRAM memory interfaces with minimal external components.

FAQ

What is the maximum continuous output current rating for the LP2995M in SOIC-8 package?

The LP2995M supports ±1.5A continuous output current in SOIC-8 package under JEDEC-standard thermal conditions (θJA = 151°C/W). Sustained operation above 1A requires derating based on ambient temperature and PCB copper area; see TI SNVS190M Figure 10 for VIN-dependent limits.

How does the LP2995M achieve SSTL-2 compliance without external resistors?

The LP2995M achieves SSTL-2 compliance using internal matched 50kΩ resistors to generate VREF and regulate VTT precisely to VDDQ/2. This eliminates external resistor networks while ensuring ≤±15mV output offset and fast transient response-key requirements defined in JEDEC JESD8-15A.

Can the LP2995M be used for SSTL-3 applications, and how is the reference voltage adjusted?

Yes, the LP2995M supports SSTL-3 by adding a series resistor (e.g., 11.1kΩ) between VDDQ and the LP2995M VDDQ pin. This modifies the internal resistor divider ratio to produce VREF = VDDQ × 0.45, enabling 1.485V termination for 3.3V DDR systems per JEDEC JESD8-16.

What is the function of the VSENSE pin on the LP2995M, and where should it be connected?

The VSENSE pin on the LP2995M provides remote feedback for improved load regulation. It must be connected to the midpoint of the VTT termination bus (e.g., center of DDR data lines) to compensate for IR drop across PCB traces; if unused, it must be shorted to VTT per TI SNVS190M Section 8.3.3.

Does the LP2995M require input or output capacitors, and what values are recommended?

The LP2995M does not require input capacitance for stability but recommends ≥10µF ceramic (X5R) near PVIN for transient suppression. Output capacitance is flexible: ≥100µF low-ESR aluminum or hybrid capacitor is recommended for DDR-SDRAM to limit VTT droop during ±3A transients, per TI application guidance.