Texas Instruments LP2992AILD-3.3

Overview

LP2992AILD-3.3 from Texas Instruments is a fixed-output, micropower, ultra-low-dropout linear regulator delivering 3.3 V at up to 250 mA with ±0.5% output accuracy (new chip), 30 µV_RMS output noise (with 10 nF bypass capacitor), and 70 dB PSRR at 1 kHz - designed for powering noise-sensitive analog circuits and low-voltage MCUs in space-constrained industrial and wireless systems.

For engineers reviewing the LP2992AILD-3.3 datasheet, LP2992AILD-3.3 pinout, LP2992AILD-3.3 application, or LP2992AILD-3.3 equivalent, key selection criteria include dropout voltage at 250 mA (225–260 mV), shutdown current (1.12 µA typ), stability with 2.2 µF ceramic output capacitors, thermal performance in SOT-23 (R_θJA = 178.6 °C/W), and enable functionality via ON/OFF pin.

Technical Context

The LP2992AILD-3.3 employs a CMOS pass transistor architecture with internal bandgap reference (1.2 V) and error amplifier feedback loop, enabling ultra-low dropout operation and high PSRR across wide frequency range (40 dB at 1 MHz). Its soft-start circuit minimizes inrush current during power-up, reducing required input capacitance.

It integrates overcurrent protection, thermal shutdown, and active output pulldown during disable mode. The BYPASS pin connects to an external 10 nF capacitor to reduce reference noise, directly enabling the 30 µV_RMS noise spec - a critical feature for RF front-ends and precision ADCs.

Key Specifications

Pinout & Package

LP2992AILD-3.3 is packaged in a 5-pin SOT-23 (DBV) package measuring 2.9 mm × 2.8 mm, with exposed pad not present (SOT-23-5 DBV variant). Thermal resistance is R_θJA = 178.6 °C/W on standard JEDEC 2s2p board.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TSS721AIDR and MCP1703T-3302E/MB, LP2992AILD-3.3 delivers superior noise performance (30 µV_RMS vs ≥45 µV_RMS), tighter accuracy over temperature (±0.5% vs ±2%), and guaranteed 125°C operation - making it the preferred choice for thermally demanding, noise-sensitive designs.

Availability

LP2992AILD-3.3 is available at Aetrix Electronics and suitable for washers and dryers, land mobile radios, and active antenna system mMIMO requiring stable component supply, long-term production continuity, and guaranteed automotive-grade thermal reliability.

Supply support for LP2992AILD-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 leader specializing in analog, embedded processing, and power management technologies, with decades of expertise in high-reliability linear regulators and precision analog ICs.

The LP2992 series belongs to TI's micropower LDO portfolio, engineered specifically for noise-sensitive, battery-operated, and thermally constrained applications - including industrial controls, wireless infrastructure, and portable instrumentation.

FAQ

What is the maximum input voltage rating for LP2992AILD-3.3?

The LP2992AILD-3.3 has an absolute maximum continuous input voltage of 18 V for the new chip revision. Its recommended operating input range is 2.5 V to 16 V. Exceeding 18 V risks permanent damage, and operation above 16 V is outside specified conditions - always maintain VIN ≤ 16 V for reliable long-term performance in the LP2992AILD-3.3.

Does LP2992AILD-3.3 require an external bypass capacitor, and why?

Yes, LP2992AILD-3.3 requires a 10 nF ceramic capacitor between the BYPASS pin and GND to achieve its specified 30 µV_RMS output noise. This capacitor filters the internal bandgap reference voltage; omitting it degrades noise performance significantly. The LP2992AILD-3.3 datasheet explicitly ties this spec to the 10 nF BYPASS cap - no alternative value or omission is supported for low-noise operation.

Can LP2992AILD-3.3 operate reliably at 125°C junction temperature?

Yes, LP2992AILD-3.3 is fully specified and tested for continuous operation at –40°C to +125°C junction temperature. Its electrical characteristics - including output accuracy (±1% over temp), dropout voltage, and PSRR - are guaranteed across this full range. Thermal design must ensure R_θJA ≤ 178.6 °C/W on standard PCB to stay within limits at 250 mA load.

What is the shutdown current of LP2992AILD-3.3, and how is it measured?

The LP2992AILD-3.3 shutdown current is 1.12 µA (typical) when the ON/OFF pin is driven below 0.15 V and VIN = 16 V at 25°C. This value increases to 2.75 µA maximum over –40°C to +125°C. It reflects total device leakage in disabled state - critical for battery backup and always-on monitoring circuits where nanoampere-level drain matters.

Is LP2992AILD-3.3 stable with a 1 µF output capacitor?

No - LP2992AILD-3.3 requires a minimum 2.2 µF ceramic output capacitor for guaranteed stability across all operating conditions. While some variants may appear stable with smaller values under light loads, the datasheet specifies 2.2 µF as the minimum for full 0–250 mA load range and –40°C to +125°C temperature. Using 1 µF violates the stability guarantee and risks oscillation or poor transient response in the LP2992AILD-3.3.