Texas Instruments LP3964EMP-1.8/NOPB

Overview

LP3964EMP-1.8/NOPB from Texas Instruments is a fixed-output 1.8-V, 800-mA ultra-low-dropout linear regulator in SOT-223 package, featuring 24 mV dropout at 80 mA, ±1.5% output voltage accuracy at 25°C, and remote sense (SENSE) capability for improved load regulation in distributed power systems.

For engineers reviewing the LP3964EMP-1.8/NOPB datasheet, LP3964EMP-1.8/NOPB pinout, LP3964EMP-1.8/NOPB application, or LP3964EMP-1.8/NOPB equivalent, key selection criteria include dropout performance under 800-mA load, thermal behavior in SOT-223, SENSE pin implementation for remote loads, and shutdown current of 15 µA.

Technical Context

The LP3964EMP-1.8/NOPB uses a PMOS pass element with typical R_DS(on) of 240 mΩ, enabling ultra-low dropout operation down to 24 mV at light load and 240 mV at full 800-mA load. Its CMOS-based control architecture delivers 15-µA quiescent current in shutdown mode and maintains stable regulation across −40°C to 125°C junction temperature.

Unlike the LP3961, this variant omits the ERROR flag but includes a dedicated SENSE pin that enables precision regulation at remote loads by closing the feedback loop at the point of use-critical for GTL+/SSTL bus terminators and DSP core supplies where trace resistance degrades local output accuracy.

Key Specifications

Pinout & Package

SOT-223 (5-pin) package, 6.50 mm × 3.56 mm body size, thermally enhanced with exposed pad (pin 5 = GND). Designed for surface-mount assembly and moderate-power dissipation up to 1.2 W at TA = 25°C with PCB copper area.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TSS721AIPW and TPS7A2018PDBVR, the LP3964EMP-1.8/NOPB uniquely combines 800-mA capability, SOT-223 thermal performance, and SENSE functionality-making it the only option among the three capable of regulating 1.8 V at full load with remote-point accuracy in compact industrial layouts.

Availability

LP3964EMP-1.8/NOPB is available at Aetrix Electronics and suitable for microprocessor core supplies, GTL+/SSTL bus terminators, DSP power management, battery-powered instrumentation, and high-efficiency linear regulation requiring stable component supply across production lifecycles.

Supply support for LP3964EMP-1.8/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 designing analog ICs, embedded processors, and power management solutions for industrial, automotive, and communications markets.

The LP396x series was developed as fast ultra-low-dropout linear regulators targeting low-voltage microprocessor and DSP applications where minimal input-to-output headroom and precise remote load regulation are essential.

FAQ

What is the minimum input voltage required for LP3964EMP-1.8/NOPB to regulate 1.8 V at 800 mA?

The LP3964EMP-1.8/NOPB requires a minimum input voltage of 2.04 V to maintain regulation at 800 mA, based on its 240-mV typical dropout voltage. However, per recommended operating conditions, VIN must be ≥2.5 V for guaranteed functionality across temperature and process variation-so 2.5 V is the practical minimum input for robust design.

How should the SENSE pin be connected if remote load regulation is not needed for LP3964EMP-1.8/NOPB?

If remote sensing is not required, the SENSE pin of the LP3964EMP-1.8/NOPB must be connected directly to the OUT pin. This configures the device for standard local regulation mode and ensures proper feedback loop closure-leaving SENSE floating will cause regulation failure and potential instability.

Does LP3964EMP-1.8/NOPB include thermal shutdown protection?

Yes, the LP3964EMP-1.8/NOPB includes integrated thermal shutdown protection with a 165°C junction threshold and 10°C hysteresis. When triggered, the device disables the pass transistor until junction temperature falls below 155°C-preventing damage during sustained overload or inadequate PCB heatsinking in the SOT-223 package.

What is the recommended output capacitor for stable operation of LP3964EMP-1.8/NOPB?

The LP3964EMP-1.8/NOPB requires a minimum 33-µF output capacitor with ESR between 0.2 Ω and 5 Ω for loop stability. Solid tantalum capacitors are preferred due to their stable ESR across temperature; ceramic capacitors alone are unsuitable unless paralleled with sufficient ESR-inducing elements to meet the 0.2–5 Ω window.

Can LP3964EMP-1.8/NOPB be used in battery-powered applications with long standby periods?

Yes, the LP3964EMP-1.8/NOPB supports ultra-low-power operation with only 15 µA quiescent current in shutdown mode. When paired with an external logic-controlled pull-down on the SD pin, it enables multi-week battery life in data loggers and portable sensors-verified across −40°C to 125°C operating range.