Texas Instruments LP5951MF-2.0

Overview

LP5951MF-2.0 from Texas Instruments is a micropower, 150-mA low-dropout CMOS voltage regulator in SC70-5 package, delivering a fixed 2.0 V output with 250 mV dropout at 150 mA, 29 µA quiescent current, and ±2 mV line transient response. It serves as a precision power supply for battery-powered microcontrollers, sensors, and RF front-ends where low standby power and fast load regulation are critical.

For engineers reviewing the LP5951MF-2.0 datasheet, LP5951MF-2.0 pinout, LP5951MF-2.0 application, or LP5951MF-2.0 equivalent, key selection considerations include its 1.8–5.5 V input range, active-high enable control, <1 nA shutdown current, stability with 1-µF ceramic capacitors, and thermal/short-circuit protection - all validated across –40°C to 125°C junction temperature.

Technical Context

The LP5951MF-2.0 employs a PMOS pass transistor architecture enabling ultra-low quiescent current and no reverse-current path without external diode (within 50 mA limit). Its internal bias generator and reference circuit maintain regulation down to 1.8 V input, with dropout defined at 100 mV below nominal output.

Enable logic thresholds are tightly specified: VIH = 0.9 V (enable) and VIL = 0.4 V (shutdown), ensuring reliable operation across full temperature and input voltage ranges. The device enters thermal shutdown at 160°C (typ.) with 20°C hysteresis, and features integrated short-circuit current limiting with automatic recovery after fault clearance.

Key Specifications

Pinout & Package

LP5951MF-2.0 is packaged in SC70-5 (2.00 mm × 1.25 mm), optimized for space-constrained portable designs. Pin functions are validated per TI SNVS345G Rev G.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LP5951MF-2.0, TPL720F12-DBVR offers higher current but mismatches the 2.0 V requirement and SC70-5 size, while MCP1700T-2002E/TT sacrifices enable control and thermal protection for ultra-low shutdown current - making LP5951MF-2.0 the optimal balance of voltage accuracy, package size, and feature set for space-constrained, enable-controlled systems.

Availability

LP5951MF-2.0 is available at Aetrix Electronics and suitable for wearable electronics, industrial wireless sensors, automotive cabin modules, and portable medical devices requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for LP5951MF-2.0 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 IC design and automotive-grade qualification.

The LP5951 product line delivers micropower, low-noise LDOs for battery-critical applications - engineered specifically for portable, medical, and industrial systems demanding ultra-low IQ, fast transient response, and robust protection features.

FAQ

What is the minimum input voltage required for LP5951MF-2.0 to regulate at 2.0 V?

The LP5951MF-2.0 requires VIN ≥ VOUT + VDO, where VDO is 250 mV at 150 mA. Thus, minimum input is 2.25 V under full load. At lighter loads, dropout decreases - e.g., ~100 mV at 1 mA - allowing regulation down to 2.1 V. Below 1.8 V input, internal circuitry ceases operation entirely, per datasheet Section 7.4.2.

Can LP5951MF-2.0 be used without connecting the EN pin?

No - the EN pin must not be left floating. If enable functionality is unused, TI specifies tying EN directly to VIN to ensure reliable turn-on. Leaving EN unconnected risks undefined behavior due to leakage-induced threshold crossing, potentially causing intermittent regulation or shutdown. This requirement is explicitly stated in Pin Functions (Section 5) and Feature Description (Section 7.3.2).

Does LP5951MF-2.0 require an output capacitor, and what type is recommended?

Yes - LP5951MF-2.0 requires a minimum 0.7 µF ceramic output capacitor (1 µF typical) with ESR between 3 mΩ and 300 mΩ. X7R dielectric is preferred for –40°C to +125°C stability; X5R or Y5V may be used with derating. Tantalum is discouraged due to higher ESR, cost, and surge-current risks. Capacitor must be placed ≤1 cm from OUT pin with low-inductance ground return.

How does LP5951MF-2.0 handle reverse current flow from VOUT to VIN?

LP5951MF-2.0 contains a PMOS pass device with an inherent body diode. When VOUT exceeds VIN, reverse current flows through this diode, limited to ≤50 mA by internal design. For currents above 50 mA, an external Schottky diode (cathode to VIN, anode to VOUT) is mandatory to prevent damage. This behavior is documented in Section 7.3.6 and Absolute Maximum Ratings.

Is LP5951MF-2.0 qualified for automotive applications?

LP5951MF-2.0 is not AEC-Q200 qualified. While it operates across –40°C to +125°C junction temperature - matching automotive cabin requirements - it lacks formal automotive qualification, stress testing, and PPAP documentation. For automotive use, TI recommends AEC-Q200-compliant alternatives such as TPS7B67xx or LP5907-Q1 series instead of LP5951MF-2.0.