Monolithic Power Systems Inc. MP62181DS-LF-P

Overview

MP62181DS-LF-P from Monolithic Power Systems is a single-channel, active-high enable power distribution switch with integrated 75mΩ MOSFET, 2A continuous current rating, 2.8A typical current limit, and thermal/over-current protection. It operates from 2.7V–5.5V input and delivers regulated power to USB VBUS ports in portable electronics.

For engineers reviewing the MP62181DS-LF-P datasheet, MP62181DS-LF-P pinout, MP62181DS-LF-P application, or MP62181DS-LF-P equivalent, key selection criteria include enable polarity (active-high), FLAG deglitch timing (8ms), reverse current blocking, UVLO threshold (2.65V), and SOIC8 thermal resistance (θJA = 90°C/W).

Technical Context

The MP62181DS-LF-P integrates a precision current-sense amplifier and thermal shutdown circuitry that triggers at 140°C with 20°C hysteresis. Its constant-current limiting responds within <1ms to ramped overloads up to 4A, maintaining output stability during short-circuit events.

It features an open-drain FLAG pin with 8ms deglitch filtering for reliable fault reporting, plus under-voltage lockout (UVLO) with 250mV hysteresis and reverse current blocking to prevent backfeed from downstream loads.

Key Specifications

Pinout & Package

MP62181DS-LF-P uses the SOIC8 package (5.00mm × 6.20mm × 1.75mm), with exposed pad connected to GND for enhanced thermal performance (θJA = 90°C/W, θJC = 42°C/W). Pin 1 marked with half-circle index.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar current-limited power distribution switch applications.

Compared with TUSB2036IPW and TPS22965DRLR, MP62181DS-LF-P uniquely combines 2A current handling, active-high enable, open-drain FLAG with deglitch, and autonomous thermal recovery-making it optimal for safety-critical, self-monitoring USB and peripheral power rails.

Availability

MP62181DS-LF-P is available at Aetrix Electronics and suitable for smartphone USB power management, notebook PC port protection, and telecom line card hot-swap applications requiring stable component supply and long-term lifecycle support.

Supply support for MP62181DS-LF-P 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

Monolithic Power Systems (MPS) is a fabless semiconductor company specializing in high-performance analog and power ICs, with design centers across Asia and North America.

The MP6218x series belongs to MPS's power distribution switch product line, engineered specifically for USB-compliant, current-limited, thermally robust power gating in portable and infrastructure equipment.

FAQ

What is the enable logic polarity of MP62181DS-LF-P?

The MP62181DS-LF-P features active-high enable: the switch turns on when EN voltage exceeds 2V (typical), and turns off when EN falls below 0.8V. This distinguishes it from the MP62180 variant, which uses active-low enable logic.

Does MP62181DS-LF-P support reverse current blocking?

Yes-it blocks reverse current with ≤0.2μA leakage when OUT is biased to 5.5V and IN is grounded. This prevents backfeed from downstream loads into the host supply, critical for USB OTG and hot-swap applications.

How does the FLAG pin behave during power-up?

The FLAG pin remains high (open-drain, pulled up externally) during power-up and does not glitch-even if IN rises before EN is asserted. This eliminates false fault reporting during system initialization sequences.

What is the thermal shutdown recovery behavior?

Upon reaching 140°C junction temperature, MP62181DS-LF-P shuts down the output. It automatically resumes operation once die temperature cools to approximately 120°C, providing hysteresis to prevent oscillation near the thermal limit.

Can MP62181DS-LF-P operate from a 3.3V supply?

Yes-the device supports input voltages from 2.7V to 5.5V. At 3.3V, it delivers full 2A continuous current with R_DS(on) ≤120mΩ (MSOP8E/QFN8E) or ≤130mΩ (SOIC8), maintaining reliable operation across common logic rail voltages.

Is an external capacitor required on the IN pin?

Yes-a minimum 10μF ceramic or tantalum capacitor between IN and GND is recommended to suppress input transients, improve short-circuit immunity, and stabilize the internal charge pump used for gate drive.

What package variants are available for MP62181?

MP62181 is offered in MSOP8E (62181DH-LF), QFN8E (2mm×3mm, 62181DD-LF), and SOIC8 (62181DS-LF-P). The "-P" suffix denotes tape-and-reel packaging with lead-free (LF) compliance and RoHS certification.