Texas Instruments LP2982IM5-3.3

Overview

LP2982IM5-3.3 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 load, and <1 μA quiescent current in shutdown mode. It serves as a precision, low-noise power supply for battery-powered portable electronics requiring stable low-voltage rails.

For engineers reviewing the LP2982IM5-3.3 datasheet, LP2982IM5-3.3 pinout, LP2982IM5-3.3 application, or LP2982IM5-3.3 equivalent, key selection criteria include dropout performance at light-to-moderate loads, ON/OFF control interface compatibility, bypass-capacitor–enabled noise reduction (30 μV RMS), thermal protection behavior, and SOT-23-5 PCB footprint constraints.

Technical Context

The LP2982IM5-3.3 uses a vertically integrated PNP (VIP) process to achieve ultra-low dropout and minimal ground current-375 μA typical at 50 mA load and 80 μA at 1 mA. Its internal bandgap reference enables 1% initial output tolerance and 0.007%/V line regulation.

It integrates ON/OFF logic control with defined thresholds (ON ≥1.4 V, OFF ≤0.15 V), sleep-mode activation (<1 μA IQ), overcurrent foldback limiting (150 mA peak), and thermal shutdown. 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 max height, gull-wing leads, standard JEDEC MO-178 footprint.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP1700T-3302E/TT and TPS70633DBVR, the LP2982IM5-3.3 uniquely combines sub-1-μA shutdown, 120-mV dropout at 50 mA, and BYPASS-enabled 30-μV noise - making it optimal for ultra-long-life, noise-sensitive, battery-constrained designs where enable control and precision are mandatory.

Availability

LP2982IM5-3.3 is available at Aetrix Electronics and suitable for portable medical sensors, wearable health monitors, industrial handheld terminals, and low-power IoT edge nodes requiring stable component supply with guaranteed long-term sourcing.

Supply support for LP2982IM5-3.3 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, personal electronics, and communications markets.

The LP2982 product line was designed specifically for micropower, ultra-low-dropout regulation in space- and battery-constrained portable electronics - emphasizing precision, low noise, and intelligent power control in miniature SOT-23 packages.

FAQ

What is the minimum input voltage required for LP2982IM5-3.3 to regulate 3.3 V output?

The LP2982IM5-3.3 requires a minimum input voltage of 3.42 V to maintain regulation at full 50 mA load, based on its 120 mV typical 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 is outside absolute maximum ratings and must be avoided.

How does the BYPASS pin on LP2982IM5-3.3 reduce output noise?

The BYPASS pin on LP2982IM5-3.3 connects to an internal bandgap reference node. Adding a 0.01 μF low-leakage capacitor (NPO/COG ceramic) here filters reference noise, reducing total output noise to 30 μV RMS (300 Hz–50 kHz). Leakage current above ~500 nA degrades accuracy, so capacitor dielectric selection is critical.

Can LP2982IM5-3.3 be used with ceramic output capacitors?

Yes, but only with a 1 Ω series resistor due to the LP2982IM5-3.3's instability risk with low-ESR ceramics. TI specifies that 2.2 μF ceramic (ESR ≈15 mΩ) causes oscillation; adding 1 Ω restores phase margin. Tantalum (4.7 μF) is preferred for stability without added components.

What happens if the output voltage exceeds the input voltage on LP2982IM5-3.3?

If VOUT rises above VIN by more than ~0.7 V, the internal PNP pass transistor's inherent collector-base diode becomes forward-biased, causing reverse current flow. This may trigger parasitic SCR latch-up and permanent damage. An external Schottky diode (cathode to VIN, anode to VOUT) is mandatory in such reverse-bias scenarios.

Is LP2982IM5-3.3 rated for automotive temperature range?

No - the LP2982IM5-3.3 is specified for −40°C to +125°C junction temperature, which meets extended industrial requirements but not AEC-Q100 automotive qualification. It lacks automotive-specific testing, traceability, and failure-rate reporting. For automotive use, consider TI's TLV70033 or TPS7B6933.