Texas Instruments LP2951CMMX-3.0/NOPB

Overview

LP2951CMMX-3.0/NOPB from Texas Instruments is a micropower, low-dropout linear voltage regulator with fixed 3.0 V output, 100 mA rated output current, ±0.5% initial accuracy at 25°C, and 75 µA typical quiescent current. It integrates an error flag output, logic-compatible shutdown input, and internal 1.235 V reference for programmable configurations-used in battery-powered instrumentation, portable medical sensors, and low-power microcontroller power rails.

For engineers reviewing the LP2951CMMX-3.0/NOPB datasheet, LP2951CMMX-3.0/NOPB pinout, LP2951CMMX-3.0/NOPB application, or LP2951CMMX-3.0/NOPB equivalent, key selection criteria include dropout performance at light loads (50 mV typ.), shutdown leakage (<10 µA), error comparator hysteresis (15 mV), and compatibility with low-ESR ceramic capacitors (10 mΩ to 6 Ω).

Technical Context

The LP2951CMMX-3.0/NOPB implements a PNP-based LDO architecture with a precision bandgap reference and error amplifier driving an internal pass transistor. Its error flag compares feedback voltage against a 1.235 V reference with ±25 mV upper threshold and ±75 mV lower threshold, enabling reliable undervoltage detection at ~5% output deviation.

Shutdown control is TTL/CMOS-compatible: regulator enables when SHUTDOWN pin voltage drops below 0.6 V (max), and disables when pulled above 2.0 V (min); shutdown current remains ≤10 µA over full temperature range. The device operates from 2.3 V to 30 V input and maintains regulation down to 3.05 V input at 100 mA load.

Key Specifications

Pinout & Package

LP2951CMMX-3.0/NOPB is housed in an 8-pin SOIC (D) package measuring 4.90 mm × 3.91 mm, with exposed thermal pad connected to Pin 4 (GND) for enhanced heat dissipation. The package supports standard reflow profiles and achieves R_θJA = 117.7°C/W on JEDEC High-K board.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar low-dropout micropower regulator applications.

Compared with TLV70730PDQNR and MCP1703T-3002E/MB, LP2951CMMX-3.0/NOPB uniquely combines diagnostic signaling (ERROR), programmable enable (SHUTDOWN), and micropower operation in a standard SOIC footprint-making it optimal for systems requiring autonomous fault response and battery longevity without sacrificing design simplicity.

Availability

LP2951CMMX-3.0/NOPB is available at Aetrix Electronics and suitable for portable medical devices, industrial data loggers, smart utility meters, and wearable health trackers requiring stable component supply across extended product lifecycles.

Supply support for LP2951CMMX-3.0/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 precision power management and industrial-grade reliability.

The LP295x-N series was designed specifically for micropower, low-dropout regulation in battery-critical applications-emphasizing ultra-low quiescent current, tight DC accuracy, and integrated system supervision features like ERROR flag and logic shutdown.

FAQ

What is the minimum input voltage required for LP2951CMMX-3.0/NOPB to maintain regulation at full 100 mA load?

The LP2951CMMX-3.0/NOPB requires a minimum input voltage of 3.38 V to sustain 3.0 V output at 100 mA load, based on its maximum dropout voltage of 380 mV. At lighter loads (e.g., 100 µA), dropout drops to 50 mV, allowing operation down to 3.05 V input. This enables compatibility with partially discharged Li-ion cells and dual-alkaline supplies.

Can LP2951CMMX-3.0/NOPB be used in adjustable-output configurations despite its fixed 3.0 V designation?

Yes, LP2951CMMX-3.0/NOPB retains full programmability via its FEEDBACK and VTAP pins. Though configured as 3.0 V at factory, connecting external resistors between OUT–FEEDBACK and FEEDBACK–GND allows reprogramming output from 1.24 V to 29 V. The internal 1.235 V reference and precision error amplifier ensure accuracy across the full range.

How does the ERROR pin of LP2951CMMX-3.0/NOPB behave during startup and dropout events?

The ERROR pin of LP2951CMMX-3.0/NOPB is an open-collector output that remains high-impedance until V_OUT reaches regulation. Once stable, it asserts low if output falls >5% below nominal (≈2.85 V), with 15 mV hysteresis preventing chatter near threshold. During startup, ERROR stays high until regulation is achieved, providing clean power-on reset timing.

What is the recommended output capacitor for LP2951CMMX-3.0/NOPB, and why is ESR range specified?

TI specifies ≥2.2 µF ceramic capacitor with ESR between 10 mΩ and 6 Ω for LP2951CMMX-3.0/NOPB stability. This range ensures phase margin >45° across temperature and load. Capacitors outside this window-especially ultra-low-ESR types (<5 mΩ) or high-ESR electrolytics (>10 Ω)-risk oscillation or poor transient response due to loop compensation interaction.

Does LP2951CMMX-3.0/NOPB support reverse-voltage protection or input overvoltage tolerance?

No, LP2951CMMX-3.0/NOPB does not integrate reverse-voltage or overvoltage protection. Absolute maximum input is 30 V, and reverse input voltage (IN < GND) must be limited to –0.3 V per datasheet. External protection-such as series Schottky diode for reverse polarity or TVS for surge-is required in harsh environments. The device relies on external components for robustness beyond its intrinsic ratings.