Texas Instruments LP2982AIM5-5.0

Overview

LP2982AIM5-5.0 from Texas Instruments is a fixed 5.0-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 load, and <1 μA quiescent current in shutdown mode - designed for battery-powered portable electronics requiring stable low-noise power.

For engineers reviewing the LP2982AIM5-5.0 datasheet, LP2982AIM5-5.0 pinout, LP2982AIM5-5.0 application, or LP2982AIM5-5.0 equivalent, key selection considerations include dropout performance at light-to-moderate loads, ON/OFF control interface behavior, bypass-capacitor–enabled noise reduction (30 μV RMS), thermal protection limits, and SOT-23-5 layout compatibility with space-constrained PCBs.

Technical Context

The LP2982AIM5-5.0 uses a vertically integrated PNP (VIP) pass transistor architecture to achieve ultra-low dropout and minimal ground current - delivering 120 mV typical V_DO at 50 mA and 375 μA typical I_GND under same load. Its internal bandgap reference enables 1% initial output tolerance and 0.007%/V line regulation.

It integrates logic-controlled enable via ON/OFF pin (1.4 V turn-on threshold, 0.15 V turn-off), sleep-mode operation (<1 μA I_Q), overcurrent foldback limiting (150 mA peak), and thermal shutdown (125°C junction limit). The BYPASS pin supports external 0.01 μF capacitor to reduce output noise to 30 μV RMS (300 Hz–50 kHz).

Key Specifications

Pinout & Package

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

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP1700T-5002E/TT and NCP1117ST50T3G, the LP2982AIM5-5.0 uniquely balances micropower shutdown, precise 5.0-V output, and SOT-23-5 integration - making it optimal for space- and battery-life–constrained portable electronics where 50 mA suffices and enable control is essential.

Availability

LP2982AIM5-5.0 is available at Aetrix Electronics and suitable for cellular handsets, portable medical sensors, laptop subsystems, and industrial data loggers requiring stable component supply with guaranteed long-term manufacturability.

Supply support for LP2982AIM5-5.0 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 company headquartered in Dallas, Texas, delivering analog and embedded processing solutions across industrial, automotive, and personal electronics markets.

The LP2982 series belongs to TI's precision micropower LDO portfolio, engineered specifically for battery-powered portable equipment demanding ultra-low dropout, sub-μA shutdown, and low-noise regulation - with emphasis on handheld, medical, and IoT edge applications.

FAQ

What is the maximum input voltage rating for the LP2982AIM5-5.0?

The LP2982AIM5-5.0 has an absolute maximum input voltage of 16 V, with recommended operating range from 2.1 V to 16 V. Exceeding 16 V risks permanent damage per Absolute Maximum Ratings. This wide range supports diverse sources including multi-cell alkaline, Li-ion, and industrial DC supplies - but design margin should maintain VIN ≤15.5 V for reliability across temperature and tolerance variation.

Does the LP2982AIM5-5.0 require an external bypass capacitor, and what happens if it is omitted?

Yes - the LP2982AIM5-5.0 requires a 0.01 μF NPO/COG ceramic capacitor between BYPASS pin and GND to achieve its specified 30 μV RMS output noise. Omitting it increases broadband noise to ~120 μV RMS, degrading performance in noise-sensitive applications like high-resolution ADCs or RF biasing. Leakage current in the capacitor must remain below 500 nA to avoid output voltage drift.

How does the ON/OFF pin function on the LP2982AIM5-5.0, and what are its voltage thresholds?

The ON/OFF pin on the LP2982AIM5-5.0 is an active-high enable input: device turns on when voltage exceeds 1.4 V (min) and turns off when pulled below 0.15 V (max). Input current is <0.01 μA at 0 V and ≤15 μA at 5 V. If unused, it must be tied to VIN - floating the pin causes undefined operation and potential oscillation.

What output capacitor types are compatible with the LP2982AIM5-5.0, and why is ESR critical?

The LP2982AIM5-5.0 requires a minimum 2.2 μF output capacitor with controlled ESR: tantalum is preferred (typical ESR 0.5–3 Ω); ceramic is permitted only with a 1 Ω series resistor to raise effective ESR above stability threshold. Low-ESR ceramics (<0.1 Ω) cause oscillation due to phase margin loss - verified in TI's application note SNVA212.

Is the LP2982AIM5-5.0 protected against reverse current flow from output to input?

The LP2982AIM5-5.0 contains an inherent PNP collector-emitter diode that conducts if V_OUT exceeds V_IN by >0.7 V, risking latch-up or damage. TI explicitly recommends adding an external Schottky diode (cathode to IN, anode to OUT) in any application where output voltage may exceed input - such as hot-swap or backup-battery scenarios - to clamp reverse voltage to ~0.3 V.