Texas Instruments LP2992ILD-3.3

Overview

LP2992ILD-3.3 from Texas Instruments is a fixed-output, micropower, ultra-low-dropout linear regulator in 5-pin SOT-23 (DBV) package, delivering up to 250mA output current 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 equipment.

For engineers reviewing the LP2992ILD-3.3 datasheet, LP2992ILD-3.3 pinout, LP2992ILD-3.3 application, or LP2992ILD-3.3 equivalent, key selection criteria include dropout voltage at 250mA (225–260mV), shutdown current (1.12μA typ), stability with 2.2µF ceramic output capacitors, and compatibility with low-ESR capacitors down to 0Ω ESR.

Technical Context

The LP2992ILD-3.3 uses a CMOS pass transistor architecture with internal bandgap reference and error amplifier, enabling ultra-low dropout and high PSRR across wide frequency range. Its BYPASS pin connects to an external 10nF capacitor to reduce reference noise, directly lowering integrated output noise to 30μVRMS (300Hz–50kHz).

It integrates active-high enable (ON/OFF), thermal shutdown, current limiting (300–350mA peak), and internal output pulldown during disable. Soft-start minimizes inrush current, reducing required input capacitance while maintaining stable startup under varying load and temperature conditions (–40°C to +125°C).

Key Specifications

Pinout & Package

LP2992ILD-3.3 is housed in a 5-pin SOT-23 (DBV) package measuring 2.9mm × 2.8mm, with exposed pad not connected internally (no thermal pad requirement).

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-3302E/MB, LP2992ILD-3.3 uniquely delivers 30μVRMS noise + 70dB PSRR + 225mV dropout in a 5-pin SOT-23, making it the only option meeting stringent RF/analog supply requirements without increasing board area or BOM count.

Availability

LP2992ILD-3.3 is available at Aetrix Electronics and suitable for industrial motor control, portable RF transceivers, smart home appliances, and cordless power tools requiring stable component supply and long-term production continuity.

Supply support for LP2992ILD-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 and embedded processing technologies, with decades of expertise in power management IC design and manufacturing.

The LP2992 series was developed specifically for micropower, low-noise LDO applications in industrial, automotive, and portable electronics where ultra-low dropout, high PSRR, and ceramic-capacitor stability are mandatory.

FAQ

What is the maximum input voltage rating for LP2992ILD-3.3?

The LP2992ILD-3.3 has an absolute maximum continuous input voltage of 18V. Its recommended operating input range is 2.5V to 16V. Exceeding 18V risks permanent damage per TI's Absolute Maximum Ratings table. The device maintains regulation down to VIN = VOUT + VDO, where VDO is as low as 225mV at 250mA load and 25°C.

Does LP2992ILD-3.3 require a bypass capacitor to achieve specified noise performance?

Yes - LP2992ILD-3.3 requires a 10nF capacitor between the BYPASS pin and GND to achieve its specified 30μVRMS output noise (300Hz–50kHz). Without this capacitor, output noise increases significantly. The BYPASS pin connects directly to the internal reference, and the external capacitor filters reference voltage noise before it modulates the output.

Can LP2992ILD-3.3 operate stably with a 1µF ceramic output capacitor?

No - LP2992ILD-3.3 requires a minimum 2.2µF ceramic output capacitor for guaranteed stability across temperature and load. While the datasheet notes "nominal output capacitance must be greater than 1μF", it explicitly specifies 2.2µF as the minimum value for new-chip variants in Recommended Operating Conditions, and stability testing was performed with ≥2.2µF X7R ceramics.

What is the shutdown current of LP2992ILD-3.3, and how is it measured?

The LP2992ILD-3.3 shutdown current is 1.12μA (typical) at VIN = 16V and –40°C ≤ TJ ≤ 125°C, measured with ON/OFF pin driven below 0.15V. This ultra-low value enables multi-year battery life in always-connected IoT sensors. The legacy chip achieves only 0.01μA, but LP2992ILD-3.3 prioritizes noise/PSRR over minimal shutdown IQ.

Is LP2992ILD-3.3 pin-compatible with other LP2992 variants such as LP2992IM5-3.3?

Yes - LP2992ILD-3.3 and LP2992IM5-3.3 share identical 5-pin SOT-23 (DBV) pinout, footprint, and electrical specifications. Both use the same "new chip" silicon revision with ±0.5% accuracy, 30μVRMS noise, and 225mV dropout at 250mA. The 'LD' and 'M5' suffixes denote different tape-and-reel packaging standards, not functional differences.