Monolithic Power Systems Inc. MP62131EK-LF-P

Overview

MP62131EK-LF-P from Monolithic Power Systems is a single-channel, active-high enable, current-limited power distribution switch optimized for USB VBUS and portable load switching. It delivers 500mA continuous current with 90mΩ R_DS(ON), operates from 2.7V to 5.5V input, and integrates output discharge, thermal shutdown, and under-voltage lockout-used in USB power rails of smartphones and set-top boxes.

For engineers reviewing the MP62131EK-LF-P datasheet, MP62131EK-LF-P pinout, MP62131EK-LF-P application, or MP62131EK-LF-P equivalent, key selection criteria include guaranteed 550–650mA current limit accuracy, 8ms FLAG deglitch timing, reverse current blocking, and MSOP8 package thermal resistance (θ_JA = 150°C/W).

Technical Context

The MP62131EK-LF-P implements a precision current-limit architecture using internal sense-FET feedback and analog current regulation, entering constant-current mode at ≥550mA and latching off only upon thermal shutdown (>140°C). Its charge-pump gate driver enables full enhancement of the internal N-channel MOSFET across the 2.7–5.5V input range.

FLAG is an open-drain, deglitched fault indicator tied to overcurrent and UVLO events-but not thermal events-with fixed 4–15ms deglitch window. The EN pin accepts CMOS/TTL logic and controls both FET conduction and output discharge path activation.

Key Specifications

Pinout & Package

MP62131EK-LF-P is housed in an 8-pin MSOP package (3.0mm × 3.0mm × 1.0mm), optimized for space-constrained portable designs. Thermal performance is characterized per JESD51-7 on a 4-layer PCB (θ_JA = 150°C/W, θ_JC = 65°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MP62131EK-LF-P, MP62055DJ-LF-Z trades discharge and thermal margin for higher current and density, while TCK107AG,LF prioritizes inrush control over fault response speed and discharge-making MP62131EK-LF-P optimal for USB VBUS where discharge, accuracy, and mid-range current are critical.

Availability

MP62131EK-LF-P is available at Aetrix Electronics and suitable for smartphone USB power switching, portable GPS power management, set-top box USB hub protection, and USB-C accessory power distribution requiring stable component supply and long-term design continuity.

Supply support for MP62131EK-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, headquartered in California and serving global power management markets since 1997.

The MP62130/MP62131 product line was designed specifically for space-constrained, battery-powered applications requiring precise current limiting, fast fault response, and integrated safety features-targeting USB, portable, and consumer interface power domains.

FAQ

What is the logic polarity of the EN pin on MP62131EK-LF-P?

The EN pin on MP62131EK-LF-P is active-high: the internal power switch turns on when EN ≥ 2.0V (typical), and turns off when EN ≤ 0.8V. This differs from the MP62130 variant, which uses active-low enable-confirmed by ordering information and functional block diagram labeling.

Does MP62131EK-LF-P support reverse current blocking during disable?

Yes. When disabled (EN low or VIN < UVLO threshold), the internal MOSFET blocks reverse current flow from OUT to IN, with measured reverse leakage of 0.2µA at V_OUT = 5.5V and V_IN = GND-enabling safe use in multi-rail systems where backfeeding must be prevented.

How does the FLAG pin behave during thermal shutdown?

The FLAG pin is not deglitched during thermal shutdown and asserts immediately upon junction temperature exceeding 140°C. Unlike overcurrent events, thermal faults bypass the 8ms deglitch circuit to provide fastest possible system-level thermal warning-verified in the "FLAG Response" section of the datasheet.

What is the maximum recommended output capacitance for stable operation?

No hard upper limit is specified, but the typical application circuit and performance curves use C_L = 1µF for timing measurements. For heavy loads, a high-value electrolytic capacitor (e.g., 100µF) is recommended on OUT per Application Information section-ensuring inrush control and transient immunity without oscillation.

Is MP62131EK-LF-P RoHS compliant and lead-free?

Yes. The "-LF" suffix explicitly denotes lead-free and RoHS-compliant packaging per MPS documentation. The device meets JEDEC J-STD-020 moisture sensitivity level (MSL) 1 and is qualified for reflow soldering up to 260°C peak temperature.

Can MP62131EK-LF-P be used with 3.3V-only systems?

Yes. With a minimum operating voltage of 2.7V and full functionality down to that rail-including accurate 550mA current limit and 90mΩ R_DS(ON)-the device supports direct integration into 3.3V domain systems such as embedded microcontroller USB hubs or low-voltage IoT peripherals.

Why is MP62131EK-LF-P marked "Not Recommended for New Designs"?

This designation reflects MPS's recommendation to migrate to MP62055 for new projects due to its higher current rating (1.5A), smaller DFN8 package, and improved thermal performance-not because of reliability issues. MP62131EK-LF-P remains fully supported, stocked, and qualified for legacy and cost-sensitive designs.