Texas Instruments LP2987AIMX-5.0

Overview

LP2987AIMX-5.0 from Texas Instruments is a fixed-output 200 mA ultra-low-dropout linear voltage regulator with programmable power-on reset delay, 5.0 V output, 0.5% initial accuracy (A-grade), 180 mV dropout at 200 mA, and SOIC-8 package - used in cellular phones, palmtop computers, and camcorders for stable low-noise local power delivery.

For engineers reviewing the LP2987AIMX-5.0 datasheet, LP2987AIMX-5.0 pinout, LP2987AIMX-5.0 application, or LP2987AIMX-5.0 equivalent, key selection factors include its micropower shutdown current (<2 µA), integrated error flag/reset functionality, single-capacitor POR delay implementation, and compatibility with ceramic or tantalum output capacitors per TI's stability guidelines.

Technical Context

The LP2987AIMX-5.0 uses a vertically integrated PNP pass transistor architecture to achieve ultra-low dropout (180 mV @ 200 mA) and low ground current (1 mA @ 200 mA). Its internal bandgap reference enables 0.5% output voltage accuracy over temperature and line regulation of 0.014%/V.

It integrates a precision comparator-based error flag that asserts low when output drops >5% below nominal, and supports external capacitor-programmable power-on reset delay via the DELAY pin (2.2 µA current source). Shutdown control is active-high with defined turn-on/turn-off thresholds (VH = 1.6 V, VL = 0.18 V).

Key Specifications

Pinout & Package

LP2987AIMX-5.0 is housed in an 8-pin SOIC (D) surface-mount package (Package Drawing D0008A), with θ_J−A = 160°C/W, RoHS-compliant matte tin lead finish, and MSL Level-1 rating.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LP2987IMX-5.0/NOPB, the LP2987AIMX-5.0 offers tighter initial accuracy for precision analog rails; compared with LP2987AIMM-5.0/NOPB, it provides lower thermal resistance in a slightly larger footprint - favoring thermally demanding or mixed-signal applications.

Availability

LP2987AIMX-5.0 is available at Aetrix Electronics and suitable for cellular phone power management, palmtop computer baseband supplies, and camcorder image sensor biasing requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.

Supply support for LP2987AIMX-5.0 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 connectivity technologies with decades of LDO design expertise.

The LP2987 series was engineered for portable and battery-powered applications demanding ultra-low dropout, micropower shutdown, and integrated power sequencing - targeting cellular, computing, and consumer imaging markets.

FAQ

What is the maximum input voltage rating for the LP2987AIMX-5.0?

The LP2987AIMX-5.0 has an absolute maximum input voltage rating of +16 V for survival conditions and an operating input voltage range of 2.1 V to +16 V. Exceeding 16 V may cause permanent damage. For reliable operation, maintain VIN within the specified operating range and ensure proper decoupling with ≥2.2 µF input capacitance close to the INPUT pin.

Does the LP2987AIMX-5.0 support remote sensing, and how is it implemented?

Yes, the LP2987AIMX-5.0 supports remote sensing via the SENSE pin (Pin 5), which connects directly to the load-side output node. This compensates for voltage drop across PCB traces between the regulator OUTPUT pin and the load, ensuring accurate 5.0 V regulation at the point of use. The SENSE trace must be routed away from noisy signals and tied directly to the load ground reference.

Can the LP2987AIMX-5.0 be used with ceramic output capacitors, and what precautions apply?

Yes, the LP2987AIMX-5.0 can be used with ceramic output capacitors, but only if a 1 Ω series resistor is added to ensure minimum ESR for stability - because low-ESR ceramics (e.g., 15 mΩ) may cause oscillation. TI recommends tantalum capacitors (≥4.7 µF) for optimal stability; if using ceramics, select NPO/COG dielectrics and verify ESR remains within TI's published stable region across temperature.

How is the power-on reset delay time calculated for the LP2987AIMX-5.0?

The power-on reset delay time (T_DELAY) for the LP2987AIMX-5.0 is set by an external capacitor on the DELAY pin using the formula C_DLY = T_DELAY / 5.59×10⁵, where C_DLY is in farads and T_DELAY in seconds. For example, a 100 ms delay requires ≈180 nF. Capacitor leakage must be low (e.g., tantalum, film, or high-quality ceramic), and values must not exceed 1 µF per TI specifications.

What is the function of the ERROR pin on the LP2987AIMX-5.0, and how should it be interfaced?

The ERROR pin on the LP2987AIMX-5.0 is an open-collector output that pulls low when the regulated output drops ≥5% below nominal (i.e., ≤4.75 V for LP2987AIMX-5.0). It must be pulled up externally (e.g., to 3.3 V or 5.0 V) with a resistor (typically 10 kΩ) to interface with MCU reset or interrupt inputs. No internal pull-up exists, and floating the pin will prevent proper fault detection.