Texas Instruments LP2983AIM5-1.2

Overview

LP2983AIM5-1.2 from Texas Instruments is a micropower 150-mA low-dropout linear voltage regulator in SOT-23-5 package, delivering fixed 1.2 V output with ±1% accuracy (A-grade), stable operation with zero-ESR ceramic capacitors, and ON/OFF control for power sequencing in space-constrained portable electronics.

For engineers reviewing the LP2983AIM5-1.2 datasheet, LP2983AIM5-1.2 pinout, LP2983AIM5-1.2 application, or LP2983AIM5-1.2 equivalent, key selection criteria include dropout performance at 150 mA, ground current vs. load (75 µA at 1 mA / 825 µA at 150 mA), thermal shutdown behavior, ESR pin configuration for ceramic capacitor stability, and ON/OFF logic thresholds (1.4 V turn-on, 0.1 V turn-off).

Technical Context

The LP2983AIM5-1.2 uses a vertically integrated PNP pass transistor architecture enabling ultra-low ground current and high PSRR (65 dB at 1 kHz) while maintaining stability with ceramic output capacitors connected between OUT and ESR pins. Its internal circuitry includes foldback current limiting, thermal shutdown, and overcurrent protection.

It operates across −40°C to +125°C junction temperature, supports input voltages from 2.2 V to 16 V, and requires only two external components: ≥1 µF input capacitor and ≥2.2 µF ceramic output capacitor tied to the dedicated ESR pin - eliminating need for ESR-tuned tantalum or aluminum electrolytic solutions.

Key Specifications

Pinout & Package

SOT-23-5 (DBV) package: 2.90 mm × 1.60 mm body size, 0.95 mm height, gull-wing leads; thermally enhanced pad not present - heat dissipation relies on PCB copper area and pin conduction.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar low-noise, micropower LDO applications.

Compared with TLC7701QDR and TPS7A0512PDBVR, the LP2983AIM5-1.2 uniquely combines A-grade 1% accuracy, zero-ESR ceramic compatibility via dedicated ESR pin, and proven thermal robustness across −40°C to +125°C - making it optimal for legacy portable designs where capacitor footprint and noise floor are critical constraints.

Availability

LP2983AIM5-1.2 is available at Aetrix Electronics and suitable for cellular phone baseband, wearable health sensor, industrial PLC I/O module, and automotive infotainment SoC core applications requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for LP2983AIM5-1.2 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, designing and manufacturing analog and embedded processing chips for industrial, automotive, and personal electronics markets.

The LP2983 series was developed as a micropower LDO family targeting portable devices with stringent size, noise, and efficiency requirements - specifically optimized for ≤1.2 V outputs using vertically integrated PNP technology.

FAQ

What is the minimum input voltage required for LP2983AIM5-1.2 to regulate 1.2 V output?

The LP2983AIM5-1.2 requires a minimum input voltage of 2.05 V at 25°C and 2.2 V across −40°C to +125°C to maintain regulation. This corresponds to a typical dropout voltage of ~180 mV at 150 mA load. Below this threshold, output voltage drops linearly with input, and regulation is lost. The device is not functional below 2.2 V over full temperature range.

How must the output capacitor be connected for LP2983AIM5-1.2 stability?

The output capacitor for LP2983AIM5-1.2 must be a ceramic type (≥2.2 µF) connected directly between the OUT pin (pin 5) and the ESR pin (pin 4), not to GND. This dedicated ESR pin provides the low-impedance return path essential for stability with zero-ESR ceramics. Connecting the capacitor to GND instead of ESR will cause oscillation and loss of regulation.

What happens to ground current when LP2983AIM5-1.2 is disabled via ON/OFF pin?

When the ON/OFF pin of LP2983AIM5-1.2 is pulled below 0.1 V (25°C) or 0.05 V (−40°C to +125°C), the regulator shuts down and ground current drops to ≤12 µA. This ultra-low shutdown current preserves battery life in systems requiring periodic wake-up, such as sensor nodes or remote controls. The ON/OFF pin draws only 0.01 µA when held at 0 V.

Does LP2983AIM5-1.2 require an input capacitor, and what type is recommended?

Yes, LP2983AIM5-1.2 requires a minimum 1 µF input capacitor placed within 1 cm of the IN pin and returned to GND. Ceramic, tantalum, or film capacitors are acceptable; no ESR requirement exists. However, if using tantalum, verify surge current rating to avoid failure during battery connection. Ceramic is preferred for size, reliability, and cost.

Can LP2983AIM5-1.2 be used in automotive applications, and what temperature rating does it support?

Yes, LP2983AIM5-1.2 is qualified for automotive environments with guaranteed operation from −40°C to +125°C junction temperature. It includes thermal shutdown and overcurrent protection, and its SOT-23-5 package meets JEDEC moisture sensitivity level 1. While not AEC-Q200 certified, its extended temperature range and protection features support under-hood and infotainment applications where full qualification is not mandated.