Texas Instruments LP2987AIM-2.8/NOPB

Overview

LP2987AIM-2.8/NOPB from Texas Instruments is a fixed-output, 200 mA ultra-low-dropout linear voltage regulator with programmable power-on reset delay and 2.8 V output. It features 180 mV dropout at 200 mA, 0.5% output voltage accuracy (A-grade), <2 μA shutdown quiescent current, and operates across −40°C to +125°C for use in battery-powered portable electronics requiring stable low-noise bias.

For engineers reviewing the LP2987AIM-2.8/NOPB datasheet, LP2987AIM-2.8/NOPB pinout, LP2987AIM-2.8/NOPB application, or LP2987AIM-2.8/NOPB equivalent, key selection criteria include dropout performance at full load, reset delay configurability via external capacitor, ground pin current vs. load, thermal limits in SOIC-8 package, and compatibility with low-ESR tantalum output capacitors.

Technical Context

The LP2987AIM-2.8/NOPB uses a vertically integrated PNP pass transistor architecture enabling ultra-low dropout and low ground current. Its error comparator monitors output voltage against a 1.23 V internal reference, asserting the open-collector ERROR pin when VOUT drops >5% below nominal.

Power-on reset delay is implemented by charging an external capacitor on the DELAY pin using a precision 2.2 µA current source; the ERROR pin transitions high once the DELAY pin voltage reaches 1.23 V. The SHUTDOWN pin enables sleep mode with sub-2 µA quiescent draw.

Key Specifications

Pinout & Package

LP2987AIM-2.8/NOPB is housed in an 8-pin SOIC surface-mount package (Package Drawing D0008A), with exposed pad not present. Thermal performance requires adequate copper pour on GND-connected layers.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLS820B0LDV50 and TPS7A2028PDQNR, the LP2987AIM-2.8/NOPB uniquely combines 2.8 V precision regulation, programmable reset delay, and open-collector ERROR flag in SOIC-8 - making it optimal for portable systems requiring coordinated power sequencing without added components.

Availability

LP2987AIM-2.8/NOPB is available at Aetrix Electronics and suitable for cellular phone power management, palmtop subsystem bias, camcorder image sensor bias, and personal stereo audio codec supply requiring stable component supply across industrial temperature ranges and long production lifecycles.

Supply support for LP2987AIM-2.8/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 specializing in analog and embedded processing solutions, with decades of leadership in power management IC design and manufacturing.

The LP2987 series belongs to TI's precision LDO voltage regulator product line, engineered for micropower, ultra-low-dropout operation in portable and battery-critical applications where accuracy, low noise, and integrated power sequencing are essential.

FAQ

What is the minimum input voltage required for LP2987AIM-2.8/NOPB to maintain regulation?

The LP2987AIM-2.8/NOPB requires a minimum input voltage of 2.1 V to operate, but to sustain 2.8 V output at full 200 mA load, VIN must exceed VOUT + dropout - i.e., ≥2.98 V typical. At lighter loads, regulation holds down to VIN = 2.1 V, as confirmed in Absolute Maximum Ratings and Electrical Characteristics tables.

Does LP2987AIM-2.8/NOPB include a bypass pin for noise reduction?

No. The BYPASS pin is exclusive to the LP2988 variant (low-noise version). The LP2987AIM-2.8/NOPB does not implement bypass functionality - its output noise is specified at 100 µV_RMS (BW = 300 Hz–50 kHz), and noise-sensitive designs should use proper PCB layout and low-ESR output capacitance instead.

How is the power-on reset delay time calculated for LP2987AIM-2.8/NOPB?

The delay time T_DELAY (seconds) is determined by the capacitor C_DLY (farads) on the DELAY pin using C_DLY = T_DELAY / 5.59×10⁵. For example, a 100 nF capacitor yields ~56 ms delay. The maximum recommended C_DLY is 1 µF, and the capacitor must have low leakage (e.g., high-quality ceramic or tantalum).

What package type is used for LP2987AIM-2.8/NOPB, and what are its thermal limitations?

LP2987AIM-2.8/NOPB uses the SOIC-8 (D) package with θ_J−A = 160°C/W. At 25°C ambient and 200 mA load, junction temperature rise is ~32°C - well within the −40°C to +125°C limit. For sustained 200 mA operation above 60°C ambient, additional copper pour or airflow is recommended.

Can LP2987AIM-2.8/NOPB be used in automotive applications?

Yes - LP2987AIM-2.8/NOPB is rated for −40°C to +125°C junction temperature and meets standard automotive ambient requirements. While not AEC-Q100 qualified, its robust thermal and electrical specs make it suitable for non-safety-critical automotive modules such as infotainment peripherals or cabin sensors where qualification is not mandated.