Texas Instruments LP2982IM5X-3.3/NOPB

Overview

LP2982IM5X-3.3/NOPB from Texas Instruments is a fixed-output 3.3 V, 50-mA ultra-low-dropout linear regulator (LDO) in SOT-23-5 package, featuring 1% output voltage accuracy (A-grade), 120 mV typical dropout at 50 mA, and <1 µA shutdown quiescent current. It serves as a precision, low-noise power supply for battery-powered portable electronics requiring stable low-voltage rails.

For engineers reviewing the LP2982IM5X-3.3/NOPB datasheet, LP2982IM5X-3.3/NOPB pinout, LP2982IM5X-3.3/NOPB application, or LP2982IM5X-3.3/NOPB equivalent, key selection criteria include dropout performance at light-to-moderate loads, ON/OFF control interface behavior, bypass-capacitor–enabled noise reduction (<30 µV RMS), thermal protection integrity, and compatibility with low-ESR tantalum output capacitors.

Technical Context

The LP2982IM5X-3.3/NOPB employs a vertically integrated PNP (VIP) pass transistor architecture to achieve ultra-low dropout and minimal ground current-375 µA typical at 50 mA load and 80 µA at 1 mA. Its internal 1.23-V bandgap reference enables high initial accuracy and tight line regulation (0.007%/V typical).

It integrates active ON/OFF control with logic-compatible thresholds (ON ≥1.4 V, OFF ≤0.15 V), sleep-mode operation (<1 µA IQ), overcurrent foldback limiting (150 mA peak), and thermal shutdown (125°C junction). The BYPASS pin connects to an external 0.01-µF capacitor to reduce output noise by stabilizing the reference node.

Key Specifications

Pinout & Package

SOT-23-5 (DBV) package: 2.90 mm × 1.60 mm body, 0.95 mm max height, gull-wing leads, RoHS-compliant, lead-free (NOPB).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP1700T-3302E/TT and TPS78033QDRVRQ1, the LP2982IM5X-3.3/NOPB uniquely balances micropower shutdown, ultra-low dropout, and bypass-enabled noise reduction in a 5-pin SOT-23 - making it optimal for space- and noise-constrained portable consumer electronics where 50 mA suffices.

Availability

LP2982IM5X-3.3/NOPB is available at Aetrix Electronics and suitable for cellular handsets, portable medical sensors, PDAs, and digital camera modules requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for LP2982IM5X-3.3/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 solutions for industrial, automotive, and personal electronics markets.

The LP2982 product line delivers ultra-low-dropout, micropower LDOs optimized for battery-powered portable devices - emphasizing minimal quiescent current, high accuracy, and low-noise operation in miniature packages.

FAQ

What is the minimum input voltage required for LP2982IM5X-3.3/NOPB to regulate 3.3 V output?

The LP2982IM5X-3.3/NOPB requires a minimum input voltage of 3.42 V to maintain regulation at full 50 mA load, based on its typical 120 mV dropout voltage. At lighter loads (e.g., 1 mA), dropout drops to 7 mV, allowing regulation from as low as 3.307 V. Input below 2.1 V violates absolute maximum ratings and disables operation.

How does the BYPASS pin function in LP2982IM5X-3.3/NOPB, and what capacitor value is recommended?

The BYPASS pin in LP2982IM5X-3.3/NOPB connects directly to the internal bandgap reference node; adding a 0.01-µF NPO or COG ceramic capacitor here reduces output noise to 30 µV RMS (300 Hz–50 kHz). Leakage current in this capacitor must stay below 500 nA across temperature to avoid output voltage drift - high-quality C0G ceramics meet this requirement reliably.

Can LP2982IM5X-3.3/NOPB be used with ceramic output capacitors, and if so, what design precautions apply?

TI does not recommend using ceramic capacitors alone at the LP2982IM5X-3.3/NOPB output due to their ultra-low ESR, which can cause instability. If ceramic is used, a 1-Ω resistor must be placed in series with the capacitor to raise effective ESR into the stable region. Tantalum (4.7 µF) remains the preferred, drop-in solution per datasheet guidance.

What protection features are integrated into LP2982IM5X-3.3/NOPB, and how do they behave under fault conditions?

The LP2982IM5X-3.3/NOPB integrates thermal shutdown (activates at ~125°C junction temperature) and foldback current limiting (150 mA peak). During overload, it enters constant-current mode, causing output voltage to collapse; prolonged short-circuit events trigger thermal cycling. These protections require no external components and reset automatically once fault conditions clear.

Is LP2982IM5X-3.3/NOPB pin-compatible with other members of the LP2982 family, such as the 5-V or 3-V variants?

Yes - all LP2982 variants (e.g., LP2982IM5X-5.0/NOPB, LP2982IM5X-3.0/NOPB) share identical SOT-23-5 (DBV) packaging and pinout. Only the output voltage and ordering suffix differ; PCB layout and external components (except output capacitor value) are fully interchangeable across the family.