Texas Instruments LP3875EMP-2.5/NOPB

Overview

LP3875EMP-2.5/NOPB from Texas Instruments is a 2.5-V, 1.5-A ultra-low-dropout linear regulator in TO-263 (DDPAK) package, featuring 380 mV dropout at full load, ±1.5% output voltage accuracy, and remote voltage sense (SENSE) capability for precision regulation at point-of-load. It operates from 2.5 V to 7 V input and delivers stable power to microprocessor cores and DSPs in space-constrained industrial and battery-powered systems.

For engineers reviewing the LP3875EMP-2.5/NOPB datasheet, LP3875EMP-2.5/NOPB pinout, LP3875EMP-2.5/NOPB application, or LP3875EMP-2.5/NOPB equivalent, key selection criteria include dropout performance at 1.5 A, SENSE pin implementation for remote load regulation, thermal resistance (R_θJA = 40.3°C/W), shutdown quiescent current (10 nA), and error flag behavior under undervoltage conditions.

Technical Context

The LP3875EMP-2.5/NOPB uses a CMOS-based PMOS pass transistor architecture enabling ultra-low dropout and load-independent quiescent current. Its dedicated SENSE pin allows closed-loop feedback directly at the remote load, decoupling regulation accuracy from PCB trace IR drop-critical for high-current, low-voltage rails where even 50 mΩ trace resistance causes >75 mV error at 1.5 A.

It integrates overtemperature and overcurrent protection with thermal shutdown, short-circuit current limiting (3.2 A peak), and an open-drain ERROR flag that asserts low when output falls >10% below nominal. Shutdown is controlled via a logic-compatible SD pin requiring external 10-kΩ pullup.

Key Specifications

Pinout & Package

LP3875EMP-2.5/NOPB is housed in a 5-pin DDPAK/TO-263 package (body size 10.16 mm × 8.42 mm) with exposed thermal pad for enhanced heat transfer. The package is RoHS-compliant and lead-free (NOPB suffix).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TSS721AIPW and TPS7A4701RGWR, LP3875EMP-2.5/NOPB uniquely combines fixed 2.5-V output, 1.5-A capability, integrated SENSE functionality, and industry-leading 380-mV dropout - making it the only choice for high-current, point-of-load regulated 2.5-V supplies where layout constraints prevent ideal placement.

Availability

LP3875EMP-2.5/NOPB is available at Aetrix Electronics and suitable for microprocessor core supplies, GTL bus terminators, DSP I/O rails, battery-powered instrumentation, and industrial embedded controllers requiring stable component supply across long production lifecycles.

Supply support for LP3875EMP-2.5/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 system-on-chip solutions for industrial, automotive, and personal electronics markets.

The LP387x product line was engineered specifically for high-current, ultra-low-dropout linear regulation in battery-powered and space-constrained systems - emphasizing fast transient response, remote sensing, and nanoscale shutdown current.

FAQ

What is the minimum input voltage required for LP3875EMP-2.5/NOPB to maintain regulation?

The LP3875EMP-2.5/NOPB requires a minimum input voltage of 2.5 V per datasheet specification, but actual minimum is determined by dropout: VIN(MIN) = VOUT + VDROPOUT. At 1.5 A load, VDROPOUT = 380 mV typical, so VIN(MIN) ≈ 2.88 V. Below this, output voltage drops nonlinearly. LP3875EMP-2.5/NOPB will remain functional down to 2.5 V input but cannot sustain full 1.5-A load at that level.

How should the SENSE pin be connected in LP3875EMP-2.5/NOPB for optimal performance?

The SENSE pin of LP3875EMP-2.5/NOPB must be connected directly to the load's power input node - not to the OUT pin - to enable remote voltage regulation. If unused, tie SENSE to OUT. Avoid sharing the SENSE trace with other signals; use a dedicated low-impedance path. LP3875EMP-2.5/NOPB's internal amplifier compares SENSE to internal reference, adjusting OUT to maintain 2.5 V precisely at the load point.

Does LP3875EMP-2.5/NOPB require external capacitors, and what are the minimum values?

Yes - LP3875EMP-2.5/NOPB requires both input and output capacitors for stability. Minimum CIN = 10 µF (ceramic, tantalum, or electrolytic); minimum COUT = 10 µF tantalum recommended, with ESR between 100 mΩ and 4 Ω. Ceramic capacitors may be used if X7R/X5R dielectric and sufficient capacitance margin are applied. LP3875EMP-2.5/NOPB becomes unstable outside these ranges.

What happens to the ERROR flag on LP3875EMP-2.5/NOPB during shutdown?

When the SD pin is pulled low to activate shutdown mode, the ERROR flag on LP3875EMP-2.5/NOPB is forced invalid (high-impedance) to conserve power. The flag resumes normal operation only after SD returns high and the device exits shutdown. During active operation, ERROR asserts low when output falls >10% below 2.5 V due to input undervoltage, overload, or thermal limit - with 5% hysteresis to prevent chatter. LP3875EMP-2.5/NOPB does not drive ERROR during shutdown.

Can LP3875EMP-2.5/NOPB be used in parallel for higher current capability?

No - LP3875EMP-2.5/NOPB is not designed for parallel operation. Its internal error amplifier and pass transistor lack current-sharing circuitry. Attempting to parallel units risks thermal runaway and unequal current distribution due to minor output voltage mismatches (±1.5%). For >1.5-A requirements, select a higher-current LDO or redesign with a switching solution. LP3875EMP-2.5/NOPB must be used as a single-channel regulator.