Texas Instruments LP2992AILD-5.0

Overview

LP2992AILD-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 (new chip), 30µVRMS output noise (with 10nF bypass capacitor), and 70dB PSRR at 1kHz. It powers low-voltage microcontrollers in battery-operated industrial control systems.

For engineers reviewing the LP2992AILD-5.0 datasheet, LP2992AILD-5.0 pinout, LP2992AILD-5.0 application, or LP2992AILD-5.0 equivalent, key selection criteria include dropout voltage at 250mA (225–260mV), shutdown current (1.12µA typ), stability with 2.2µF ceramic output capacitors, and operation across –40°C to +125°C junction temperature.

Technical Context

The LP2992AILD-5.0 uses a CMOS pass transistor with R_DS(ON) derived from dropout voltage and rated current, enabling ultra-low dropout performance scaling with load. Its internal bandgap reference feeds an error amplifier controlling the pass element, with soft-start circuitry limiting inrush current during enable.

It integrates active-high ON/OFF control, overcurrent protection, thermal shutdown, and internal output pulldown. The BYPASS pin connects to a 10nF capacitor to reduce reference noise, directly enabling the 30µVRMS output noise specification and high PSRR (>70dB @ 1kHz).

Key Specifications

Pinout & Package

LP2992AILD-5.0 is housed 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 R_θJA is 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-5002E/MB, LP2992AILD-5.0 uniquely balances ultra-low dropout (225mV), micropower operation (69µA), and low-noise performance (30µV_RMS)-enabling compact, battery-efficient designs where both efficiency and signal integrity are critical.

Availability

LP2992AILD-5.0 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 manufacturability, and guaranteed parametric compliance.

Supply support for LP2992AILD-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 connectivity technologies, with decades of LDO design heritage and broad industrial qualification.

The LP2992 series was developed specifically for micropower, low-noise, ultra-low-dropout regulation in space-constrained, battery-sensitive applications such as portable instrumentation, industrial controls, and wireless infrastructure.

FAQ

What is the output voltage tolerance of LP2992AILD-5.0 over temperature and load?

LP2992AILD-5.0 guarantees ±0.5% output voltage accuracy across full load (1–250 mA) and temperature (–40°C to +125°C), per its "new chip" specification. This exceeds legacy-grade variants (±1.5%) and ensures reliable logic-level compatibility for modern low-voltage MCUs without external trimming.

Does LP2992AILD-5.0 require an external bypass capacitor, and why?

Yes - LP2992AILD-5.0 requires a 10 nF 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 increases output noise by ~3× and degrades PSRR above 10 kHz.

What is the minimum input voltage needed for LP2992AILD-5.0 to maintain regulation at 250mA?

At 250 mA and –40°C to +125°C, LP2992AILD-5.0 requires a minimum input voltage of 5.34 V (5.0 V + 340 mV max dropout). At 25°C, the typical dropout is 225 mV, so V_IN(min) = 5.225 V. This ultra-low dropout enables operation from partially discharged Li-ion or 5.5V buck-boost outputs.

Can LP2992AILD-5.0 be used with ceramic output capacitors smaller than 2.2µF?

No - LP2992AILD-5.0 is only guaranteed stable with ≥2.2 µF ceramic output capacitance (X5R/X7R, 10% tolerance, derated to ≥1 µF effective value). Using smaller values risks oscillation or degraded transient response, especially under dynamic load conditions.

What is the shutdown current of LP2992AILD-5.0, and how is it enabled?

LP2992AILD-5.0 draws 1.12 µA (typ) shutdown current when the ON/OFF pin is driven below 0.15 V. This active-low disable mode engages internal output pulldown, rapidly discharging the output node - critical for safe power sequencing in multi-rail systems.