Texas Instruments LP2992AILDX-5.0

Overview

LP2992AILDX-5.0 from Texas Instruments is a fixed-output, micropower, ultra-low-dropout linear regulator in 5-pin SOT-23 (DBV) package, delivering up to 250mA with ±0.5% output accuracy, 30µVRMS noise (with 10nF bypass), and 70dB PSRR at 1kHz. It powers low-voltage MCUs in battery-operated industrial control systems where stable 5.0V rail integrity is critical.

For engineers reviewing the LP2992AILDX-5.0 datasheet, LP2992AILDX-5.0 pinout, LP2992AILDX-5.0 application, or LP2992AILDX-5.0 equivalent, key selection criteria include dropout voltage at 250mA (225–260mV), shutdown current (1.12µA typ), thermal performance (RθJA = 178.6°C/W), and compatibility with 2.2µF ceramic output capacitors without ESR requirements.

Technical Context

The LP2992AILDX-5.0 uses a CMOS pass transistor architecture with internal bandgap reference and soft-start circuitry, enabling controlled inrush current and fast load transient response. Its BYPASS pin connects to an external 10nF capacitor to reduce reference noise, directly lowering output voltage noise to 30µVRMS over 300Hz–50kHz.

It integrates active-high enable (ON/OFF), overcurrent limiting (300–350mA peak), thermal shutdown, and internal output pulldown during disable. Operating junction temperature spans –40°C to +125°C, supporting automotive-grade ambient environments without derating.

Key Specifications

Pinout & Package

LP2992AILDX-5.0 is housed in a 5-pin SOT-23 (DBV) package measuring 2.9mm × 2.8mm, with exposed pad not present - thermal path relies on standard PCB copper area under pins 2 (GND) and 4 (BYPASS).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLS850F0TESK and MCP1703T-5002E/MB, the LP2992AILDX-5.0 delivers superior noise performance (30µVRMS vs >100µVRMS) and tighter accuracy (±0.5% vs ±2%), making it optimal for signal-chain and precision MCU applications - though it lacks integrated safety features or higher current capability.

Availability

LP2992AILDX-5.0 is available at Aetrix Electronics and suitable for washers and dryers, land mobile radios, active antenna system mMIMO, and cordless power tools requiring stable component supply, long-term industrial lifecycle support, and guaranteed traceability.

Supply support for LP2992AILDX-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 leader specializing in analog and embedded processing technologies, with decades of expertise in power management IC design and manufacturing.

The LP2992 series belongs to TI's micropower LDO portfolio, engineered specifically for noise-sensitive, battery-constrained, and thermally demanding applications in industrial, communications, and consumer equipment.

FAQ

What is the maximum input voltage rating for LP2992AILDX-5.0?

The LP2992AILDX-5.0 has an absolute maximum continuous input voltage of 18V. Its recommended operating input range is 2.5V to 16V. Exceeding 18V risks permanent damage, and operation above 16V falls outside specified performance guarantees. Always maintain ≥1µF input capacitance and observe thermal limits when operating near maximum ratings.

Does LP2992AILDX-5.0 require an external bypass capacitor?

Yes - LP2992AILDX-5.0 requires a 10nF capacitor between the BYPASS pin and GND to achieve its specified 30µVRMS output noise. Without this capacitor, noise increases significantly (up to 100µVRMS). The capacitor must be placed close to the BYPASS pin with short traces to preserve high-frequency noise suppression effectiveness.

What is the dropout voltage of LP2992AILDX-5.0 at full 250mA load and 125°C?

At 250mA load and TJ = 125°C, the LP2992AILDX-5.0 dropout voltage is 340mV maximum (per datasheet Figure 5-30). This means the device maintains regulation as long as VIN ≥ 5.34V. At room temperature, dropout is 225–260mV - the elevated value at high temperature reflects increased RDS(ON) of the CMOS pass element.

Can LP2992AILDX-5.0 operate with a 1µF output capacitor?

No - LP2992AILDX-5.0 requires a minimum 2.2µF ceramic output capacitor for stability across all operating conditions. Using 1µF violates the recommended operating condition and may cause oscillation or poor transient response. The 2.2µF value accounts for typical 50% capacitance derating of X5R/X7R MLCCs at DC bias.

What is the shutdown current of LP2992AILDX-5.0 when disabled?

When the ON/OFF pin is driven low (<0.15V), the LP2992AILDX-5.0 enters shutdown mode with a typical current draw of 1.12µA at 25°C and 1.12–2.75µA over –40°C to 125°C. This ultra-low shutdown current makes it suitable for battery-powered systems requiring multi-year shelf life or deep sleep modes.