Texas Instruments LP2992IM5X-5.0

Overview

LP2992IM5X-5.0 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, 30µVRMS output noise (with 10nF bypass capacitor), and 70dB PSRR at 1kHz. It operates across 2.5V–16V input and maintains regulation down to 2.35V minimum input at full load and temperature extremes, serving as a precision post-regulator for low-voltage MCUs and RF subsystems in battery-powered industrial equipment.

For engineers reviewing the LP2992IM5X-5.0 datasheet, LP2992IM5X-5.0 pinout, LP2992IM5X-5.0 application, or LP2992IM5X-5.0 equivalent, key selection criteria include dropout voltage at 250mA (≤260mV), shutdown current (1.12µA typ), stability with 2.2µF ceramic output capacitors, and enable-pin logic thresholds (0.15V low / 1.6V high) under full temperature range.

Technical Context

The LP2992IM5X-5.0 uses a CMOS pass transistor architecture with internal bandgap reference and error amplifier, enabling ultra-low quiescent current (69µA at zero load) while maintaining tight output regulation across line, load, and temperature. 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), thermal shutdown, and foldback current limiting-features confirmed for the "new chip" variant. The device achieves 70dB PSRR at 1kHz and 40dB at 1MHz by combining high-loop-gain error amplification and bypass-capacitor-assisted reference filtering, making it suitable for cleaning switching DC/DC converter ripple in sensitive analog and RF supply rails.

Key Specifications

Pinout & Package

LP2992IM5X-5.0 is housed in a 5-pin SOT-23 (DBV) package measuring 2.9mm × 2.8mm, with exposed pad not present (SOT-23-5 DBV has no thermal pad). Pin functions are validated per TI SNVS171L Rev FEBRUARY 2025.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TSS721AIDR and MCP1703T-5002E/MB, LP2992IM5X-5.0 uniquely delivers ±0.5% accuracy, 30µVRMS noise, and 70dB PSRR in a single SOT-23-5 package - making it the only option among the three qualified for RF-bias and precision ADC reference applications demanding simultaneous low noise and tight regulation.

Availability

LP2992IM5X-5.0 is available at Aetrix Electronics and suitable for industrial motor control boards, active antenna mMIMO systems, cordless power tools, and land mobile radios requiring stable component supply with guaranteed long-term manufacturability and consistent parametric performance.

Supply support for LP2992IM5X-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, embedded processing, and power management technologies, with decades of expertise in high-reliability industrial and automotive-grade components.

The LP2992 product line was designed specifically for micropower, low-noise, ultra-low-dropout regulation in space-constrained, thermally demanding applications - targeting industrial automation, wireless infrastructure, and portable professional equipment.

FAQ

What is the maximum output current capability of the LP2992IM5X-5.0?

The LP2992IM5X-5.0 delivers up to 250mA of continuous output current while maintaining regulation and thermal safety. Its internal current limit is set to approximately 300–350mA peak, and thermal shutdown activates if junction temperature exceeds +150°C. At 250mA and +125°C ambient, the dropout voltage remains ≤260mV, ensuring reliable operation in high-temperature industrial environments.

Does the LP2992IM5X-5.0 require an external bypass capacitor, and why?

Yes - the LP2992IM5X-5.0 requires a 10nF capacitor between the BYPASS pin and GND to achieve its specified 30µVRMS output noise. This capacitor filters the internal bandgap reference voltage, directly reducing noise contribution to the error amplifier. Omitting it increases output noise to ~65µVRMS, degrading performance in noise-sensitive applications like RF biasing and precision ADC references.

What is the recommended output capacitor for stable operation of the LP2992IM5X-5.0?

The LP2992IM5X-5.0 is stable with a minimum 2.2µF ceramic output capacitor having an ESR ≤1Ω. TI validates this with X5R/X7R MLCCs; larger values (e.g., 4.7µF) improve transient response. Capacitors with higher ESR require a parallel 100nF MLCC placed close to the OUT pin. Electrolytic or tantalum capacitors are unnecessary and discouraged due to aging and reliability concerns.

How does the ON/OFF pin function on the LP2992IM5X-5.0, and what are its voltage thresholds?

The ON/OFF pin is an active-high enable input. The LP2992IM5X-5.0 turns on when the pin voltage exceeds 1.6V (min) and turns off when it falls below 0.15V (max), across –40°C to +125°C. When disabled, an internal pulldown actively discharges the output. If unused, tie ON/OFF to IN - no external pull-up is needed, simplifying layout and reducing component count.

Is the LP2992IM5X-5.0 compatible with 12V input rails, and what is its dropout behavior at full load?

Yes - the LP2992IM5X-5.0 supports input voltages up to 16V, making it fully compatible with standard 12V industrial rails. At 250mA load and +125°C junction temperature, its dropout voltage is ≤260mV, meaning it regulates cleanly down to VIN = 5.26V. This allows robust operation even with significant input droop during motor startup or battery discharge in 12V-powered systems.