Texas Instruments LP5951MF-3.0

Overview

LP5951MF-3.0 from Texas Instruments is a micropower, 150-mA low-dropout CMOS voltage regulator in SC70-5 package, delivering a fixed 3.0 V output with 250 mV dropout at 150 mA, 29 µA quiescent current, and ±2 mV line transient response - designed for battery-powered portable systems requiring stable low-noise supply to microcontrollers and RF ICs.

For engineers reviewing the LP5951MF-3.0 datasheet, LP5951MF-3.0 pinout, LP5951MF-3.0 application, or LP5951MF-3.0 equivalent, key selection criteria include its 1.8–5.5 V input range, active-high enable control, thermal/short-circuit protection, stability with 1-µF ceramic capacitors, and operation across –40°C to 125°C junction temperature.

Technical Context

The LP5951MF-3.0 employs a PMOS pass device architecture enabling ultra-low quiescent current (29 µA typ.) and near-zero shutdown current (<1 nA). Its internal bias generator and LDO core are optimized for fast turn-on (30 µs typ.) and minimal load/line transients (±2 mV line, 50 mVpp load).

It integrates logic-controlled enable with defined VIH = 0.9 V and VIL = 0.4 V thresholds, thermal shutdown at 160°C (20°C hysteresis), and short-circuit current limiting. Stability is guaranteed with 1-µF X7R ceramic output capacitors (ESR 3–300 mΩ) without external compensation.

Key Specifications

Pinout & Package

LP5951MF-3.0 is housed in a 2.00 mm × 1.25 mm SC70-5 surface-mount package with 0.65 mm lead pitch, optimized for space-constrained portable designs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPL720F30 and MCP1700T-3002E/MB, LP5951MF-3.0 uniquely balances ultra-low IQ, robust thermal performance (125°C junction), integrated enable, and compact SC70-5 packaging - making it optimal for high-reliability, space-constrained, battery-operated systems demanding both efficiency and ruggedness.

Availability

LP5951MF-3.0 is available at Aetrix Electronics and suitable for wearable electronics, wireless sensor networks, portable medical diagnostics, and industrial telemetry requiring stable component supply with long-term manufacturability.

Supply support for LP5951MF-3.0 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 and embedded processing technologies, with decades of expertise in power management ICs for portable and industrial applications.

The LP5951MF-3.0 belongs to TI's micropower LDO family engineered specifically for battery-powered portable systems - prioritizing ultra-low quiescent current, small footprint, and robust transient performance without external compensation.

FAQ

What is the minimum input voltage required for LP5951MF-3.0 to regulate at full 150 mA output?

The LP5951MF-3.0 requires VIN ≥ VOUT + VDO = 3.0 V + 0.25 V = 3.25 V to deliver 150 mA while maintaining regulation. Below this, output current capability drops progressively; at VIN = 3.0 V, maximum load is near zero. Input must also meet absolute minimum of 1.8 V for internal circuit functionality.

Can LP5951MF-3.0 operate without an enable signal connected?

Yes - the EN pin of LP5951MF-3.0 can be tied directly to VIN to maintain continuous operation. Leaving EN floating is prohibited; it must be actively driven high (≥0.9 V) or low (≤0.4 V) per datasheet specifications to ensure predictable behavior and avoid partial enable states.

What output capacitor types and values are validated for stable operation of LP5951MF-3.0?

LP5951MF-3.0 is validated with 1-µF ceramic capacitors (X7R, X5R, Y5V, Z5U dielectrics), with ESR between 3 mΩ and 300 mΩ. X7R is strongly recommended for –40°C to +125°C operation due to ±15% capacitance tolerance; minimum capacitance must remain ≥0.7 µF across temperature, bias, and aging.

Does LP5951MF-3.0 provide reverse current protection?

No - LP5951MF-3.0 contains a PMOS pass device with an inherent body diode that conducts if VOUT exceeds VIN. For applications where output may be pulled above input (e.g., hot-swap, backup supply), an external Schottky diode (cathode to VIN, anode to VOUT) is required to block reverse current exceeding 50 mA.

How does thermal shutdown behave in LP5951MF-3.0 during sustained overload?

When LP5951MF-3.0 junction temperature reaches ~160°C, thermal shutdown disables the PMOS pass device. After cooling to ~140°C (20°C hysteresis), it automatically re-enables. Under continuous overload, this results in pulsed output voltage - a self-protecting oscillation that prevents permanent damage but requires thermal design review to avoid functional interruption.