Texas Instruments LP2989AILD-3.0/NOPB

Overview

LP2989AILD-3.0/NOPB from Texas Instruments is a fixed-output 3.0-V, 500-mA ultra-low-dropout linear regulator optimized for ceramic output capacitors in space-constrained, low-noise power rails. It delivers 0.75% output voltage accuracy (A grade), 310 mV typical dropout at 500 mA, and 18 µV_RMS output noise with 10-nF bypass capacitor - enabling use in precision analog, RF biasing, and battery-powered computing subsystems.

For engineers reviewing the LP2989AILD-3.0/NOPB datasheet, LP2989AILD-3.0/NOPB pinout, LP2989AILD-3.0/NOPB application, or LP2989AILD-3.0/NOPB equivalent, key selection criteria include verified dropout performance at full load, ground current behavior across temperature, error flag threshold tolerance, and WSON-8 thermal pad implementation guidance.

Technical Context

The LP2989AILD-3.0/NOPB uses a vertically integrated PNP (VIP) pass element to achieve ultra-low dropout and minimal ground current - 3 mA typical at 500 mA load and only 110 µA at 100 µA. Its internal 1.23-V reference enables high initial accuracy and tight line regulation (0.005%/V typical).

It integrates an error comparator with ±5% output undervoltage detection (active-low ERROR pin), shutdown control with 0.18 V turn-off and 1.6 V turn-on thresholds, and foldback current limiting with thermal shutdown - all operating across −40°C to +125°C junction temperature.

Key Specifications

Pinout & Package

LP2989AILD-3.0/NOPB is packaged in an 8-pin WSON (NGN) package measuring 4.00 mm × 4.00 mm with an exposed thermal pad on the bottom. The thermal pad must be connected to PCB ground plane via thermal vias for reliable 500-mA operation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLS850F3TAV50 and TPS7A2030PDQNR, the LP2989AILD-3.0/NOPB uniquely balances 500-mA capability, precision accuracy, integrated error flag, and WSON thermal performance - making it optimal for industrial and computing applications needing robust, monitorable regulation without automotive qualification overhead.

Availability

LP2989AILD-3.0/NOPB is available at Aetrix Electronics and suitable for industrial sensor nodes, portable computing power rails, RF front-end biasing, and medical diagnostic instrumentation requiring stable component supply and long-term manufacturability.

Supply support for LP2989AILD-3.0/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 digital signal processors for industrial, automotive, and communications markets.

The LP2989 series belongs to TI's precision LDO portfolio targeting low-noise, micropower, and ultra-low-dropout regulation - developed specifically for battery-powered and noise-sensitive applications where accuracy, efficiency, and reliability are non-negotiable.

FAQ

What is the maximum continuous output current of the LP2989AILD-3.0/NOPB?

The LP2989AILD-3.0/NOPB delivers 500 mA continuous output current under recommended operating conditions (T_J ≤ 125°C, sufficient PCB copper area for thermal dissipation). At 500 mA load, its typical dropout is 310 mV and ground current is 3 mA. Peak current capability reaches 800 mA briefly, but sustained operation above 500 mA risks thermal shutdown unless board-level thermal design exceeds minimum WSON-8 guidelines in AN-1187.

Does the LP2989AILD-3.0/NOPB require external capacitors, and what values are mandatory?

Yes - LP2989AILD-3.0/NOPB requires a minimum 2.2-µF ceramic input capacitor between INPUT and GROUND, and a minimum 4.7-µF ceramic output capacitor between OUTPUT and GROUND for stability. For lowest noise, a 10-nF capacitor must also be placed between BYPASS (Pin 1) and GROUND. Larger output capacitance improves transient response but does not affect stability. All capacitors must be X5R/X7R dielectric with appropriate voltage rating.

How does the ERROR pin on the LP2989AILD-3.0/NOPB function, and what is its threshold?

The ERROR pin on the LP2989AILD-3.0/NOPB is an open-drain output that pulls low when the regulated OUTPUT voltage falls more than approximately 5% below nominal (i.e., below 2.85 V for LP2989AILD-3.0/NOPB). Its upper threshold is −4.8% V_OUT, lower threshold is −6.6% V_OUT, and hysteresis is 2% - providing noise-immune fault detection. It sinks up to 150 µA at 2.85 V and is compatible with 3.3-V or 5-V logic supervisors.

Can the LP2989AILD-3.0/NOPB be used with input voltages below 3.0 V?

No - the LP2989AILD-3.0/NOPB requires a minimum input voltage of 2.1 V, but to maintain 3.0-V regulation, VIN must exceed VOUT by at least the dropout voltage. At 500 mA, dropout is up to 650 mV over temperature, so VIN must be ≥3.65 V for guaranteed regulation. Operation with VIN < 3.3 V is only viable at very light loads (e.g., <100 µA), where dropout drops to ~1 mV - insufficient for most powered applications.

What is the purpose of Pin 2 (N/C) on the LP2989AILD-3.0/NOPB, and how should it be handled on the PCB?

Pin 2 on the LP2989AILD-3.0/NOPB is a no-connect (N/C) calibration pin reserved for post-packaging factory trimming of output voltage accuracy. It must remain electrically floating - never connected to ground, supply, or any other net. PCB layout must omit any solder mask opening, trace, or via at Pin 2. Continuity testing or probing this pin may activate internal trim circuitry and shift VOUT out of specification.