Texas Instruments LP2992AIM5-1.5

Overview

LP2992AIM5-1.5 from Texas Instruments is a fixed-output, micropower, ultra-low-dropout linear regulator in SOT-23-5 (DBV) package, delivering up to 250mA with ±0.5% output accuracy (new chip), 30μVRMS output noise (with 10nF bypass capacitor), and 70dB PSRR at 1kHz. It serves as a post-regulator for noise-sensitive analog/RF subsystems in battery-powered industrial and communications equipment.

For engineers reviewing the LP2992AIM5-1.5 datasheet, LP2992AIM5-1.5 pinout, LP2992AIM5-1.5 application, or LP2992AIM5-1.5 equivalent, key selection criteria include dropout voltage at 250mA (225mV max over temperature), stability with 2.2µF ceramic output capacitors, shutdown current (1.12μA typ), and compatibility with low-ESR capacitors in space-constrained SOT-23 layouts.

Technical Context

The LP2992AIM5-1.5 uses a CMOS pass transistor architecture with internal bandgap reference and soft-start circuitry, enabling controlled inrush current during power-up. Its BYPASS pin connects to an external 10nF capacitor to reduce reference noise, directly contributing to the 30μVRMS output noise specification.

It integrates active-high enable (ON/OFF) logic with 0.72V low-threshold and 0.85V high-threshold (new chip), overcurrent limiting (300–350mA peak), thermal shutdown, and internal output pulldown for safe discharge when disabled - all operating across –40°C to +125°C junction temperature.

Key Specifications

Pinout & Package

LP2992AIM5-1.5 is packaged in a 5-pin SOT-23 (DBV) measuring 2.9mm × 2.8mm, with exposed pad not present (SOT-23-5, not WSON). The pinout is validated per TI SNVS171L Rev FEBRUARY 2025.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TSS721AIDR and MCP1826T-1502E/DB, LP2992AIM5-1.5 uniquely delivers ±0.5% accuracy, 30μVRMS noise via BYPASS pin, and 250mA capability in SOT-23 - making it the only option among the three qualified for noise-critical RF and precision analog subsystems.

Availability

LP2992AIM5-1.5 is available at Aetrix Electronics and suitable for active antenna mMIMO systems, motor drives and control boards, land mobile radios, and cordless power tools requiring stable component supply with guaranteed long-term manufacturability.

Supply support for LP2992AIM5-1.5 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 communications markets.

The LP2992 product line targets ultra-low-noise, micropower LDO regulation for RF, sensor, and precision analog subsystems where PSRR, dropout, and output accuracy are critical - especially in thermally constrained SOT-23 layouts.

FAQ

What is the output voltage tolerance of LP2992AIM5-1.5 over temperature and load?

LP2992AIM5-1.5 guarantees ±0.5% output voltage accuracy across full load (1mA–250mA) and temperature (–40°C to +125°C), as specified for the "new chip" variant in TI's SNVS171L datasheet. This exceeds legacy-grade parts (±1.5%) and ensures tight regulation for low-voltage MCUs and RF ICs without external trimming.

Can LP2992AIM5-1.5 operate stably with a 1µF output capacitor?

No - LP2992AIM5-1.5 requires a minimum 2.2µF ceramic output capacitor (derated to ≥1µF effective value) for guaranteed stability. Using 1µF violates the recommended operating condition and risks oscillation, especially under dynamic load. The 2.2µF value is validated for ESR ≤1Ω and ensures phase margin across temperature and process variation.

What is the purpose of the BYPASS pin on LP2992AIM5-1.5?

The BYPASS pin on LP2992AIM5-1.5 connects to a 10nF capacitor to ground to filter the internal bandgap reference voltage, directly reducing output noise to 30μVRMS (300Hz–50kHz). Omitting this capacitor increases noise by >3× and degrades PSRR - it is mandatory for applications requiring ultra-low-noise regulation like VCO biasing or ADC reference supplies.

Does LP2992AIM5-1.5 support shutdown mode, and what is its quiescent current?

Yes - driving the ON/OFF pin below 0.72V disables LP2992AIM5-1.5 and activates internal output pulldown. In shutdown, typical quiescent current is 1.12μA (max 2.75μA over temperature), enabling ultra-low-power storage modes in battery-operated devices such as cordless tools and portable radios.

Is LP2992AIM5-1.5 pin-compatible with other SOT-23-5 LDOs like the LP2985 series?

No - LP2992AIM5-1.5 has unique pin assignment: Pin 4 is BYPASS (not GND or NC), and Pin 3 is ON/OFF (not GND). Substituting with LP2985-15DBVR (which uses Pin 3 as GND) would cause functional failure. Always verify pin functions against TI SNVS171L; no drop-in replacement exists without board redesign.