Texas Instruments LP2992IM5X-3.3/NOPB

Overview

LP2992IM5X-3.3/NOPB from Texas Instruments is a fixed-output, micropower, ultra-low-dropout linear regulator in SOT-23-5 (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 operates across 2.5V–16V input range and supports stable regulation with 2.2µF ceramic output capacitors - ideal for powering noise-sensitive analog circuitry and low-voltage microcontrollers in portable industrial systems.

For engineers reviewing the LP2992IM5X-3.3/NOPB datasheet, LP2992IM5X-3.3/NOPB pinout, LP2992IM5X-3.3/NOPB application, or LP2992IM5X-3.3/NOPB equivalent, key selection criteria include dropout voltage at 250mA (225–260mV), shutdown current (1.12μA typ), thermal protection, and compatibility with low-ESR ceramic capacitors without requiring tantalum or electrolytic types.

Technical Context

The LP2992IM5X-3.3/NOPB uses a CMOS pass transistor architecture with internal bandgap reference and error amplifier, enabling ultra-low dropout and high PSRR performance. 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), internal soft-start, overcurrent limiting (300–350mA peak), and thermal shutdown. The device maintains ±1% output accuracy across load (1–250mA) and temperature (–40°C to +125°C), meeting tight regulation requirements for modern MCU cores and RF front-end biasing.

Key Specifications

Pinout & Package

LP2992IM5X-3.3/NOPB is packaged in a 5-pin SOT-23 (DBV) case measuring 2.9mm × 2.8mm, with exposed pad not present (SOT-23-5 DBV variant). The package is RoHS-compliant and lead-free (NOPB suffix).

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, LP2992IM5X-3.3/NOPB uniquely delivers 30μVRMS noise + 70dB PSRR in SOT-23-5, making it the only choice for RF biasing and precision ADC reference supplies where both low noise and small footprint are non-negotiable.

Availability

LP2992IM5X-3.3/NOPB is available at Aetrix Electronics and suitable for motor control boards, industrial sensor nodes, active antenna systems, and cordless power tool designs requiring stable component supply, long-term manufacturability, and guaranteed RoHS-compliant sourcing.

Supply support for LP2992IM5X-3.3/NOPB 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 high-reliability manufacturing.

The LP2992 belongs to TI's micropower LDO family engineered for noise-sensitive, battery-constrained, and thermally demanding applications - emphasizing ultra-low dropout, low-noise regulation, and robust protection in compact packages.

FAQ

What is the minimum input voltage required for LP2992IM5X-3.3/NOPB to maintain regulation at full 250mA load?

The LP2992IM5X-3.3/NOPB requires a minimum input voltage of 3.525V (3.3V + 225mV typical dropout) to maintain regulation at 250mA load and 25°C. At –40°C to +125°C, the worst-case dropout rises to 340mV, so VIN must be ≥3.64V across temperature. This ensures stable 3.3V output even during battery voltage sag or line transients.

Does LP2992IM5X-3.3/NOPB require a bypass capacitor, and what value is recommended?

Yes, LP2992IM5X-3.3/NOPB requires a 10nF ceramic capacitor between the BYPASS pin and GND to achieve its specified 30μVRMS output noise. Using smaller values (e.g., 1nF) increases noise; omitting it degrades noise performance to ~100μVRMS. The capacitor must be placed close to the BYPASS pin with short traces to minimize inductance.

Can LP2992IM5X-3.3/NOPB operate with a 1µF output capacitor?

No - LP2992IM5X-3.3/NOPB requires a minimum 2.2µF ceramic output capacitor for stability per TI's Recommended Operating Conditions. A 1µF capacitor violates the stability margin and may cause oscillation or poor transient response. Derating to 50% means the effective capacitance at the pin must remain ≥1µF, so 2.2µF nominal is the verified minimum.

What is the shutdown current of LP2992IM5X-3.3/NOPB, and how is it measured?

The shutdown current of LP2992IM5X-3.3/NOPB 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 industrial sensors. It is significantly lower than legacy LP2992 variants (0.01μA typ) due to updated process and biasing.

Is LP2992IM5X-3.3/NOPB pin-compatible with other SOT-23-5 LDOs like the LP2985 or TLV70033?

No - LP2992IM5X-3.3/NOPB has a unique pinout: IN (1), GND (2), ON/OFF (3), BYPASS (4), OUT (5). TLV70033 uses IN (1), GND (2), NC (3), EN (4), OUT (5); LP2985 uses IN (1), GND (2), EN (3), OUT (5), NC (4). The BYPASS pin (Pin 4) and ON/OFF placement differ, making direct replacement impossible without PCB redesign.