Monolithic Power Systems Inc. MP62131EK-LF-Z

Overview

MP62131EK-LF-Z from Monolithic Power Systems is a single-channel, active-high enable current-limited power distribution switch with 500mA continuous current rating, 90mΩ R_DS(ON), and integrated output discharge. It operates from 2.7V to 5.5V input and delivers precise overcurrent protection in USB power distribution and portable device load switching.

For engineers reviewing the MP62131EK-LF-Z datasheet, MP62131EK-LF-Z pinout, MP62131EK-LF-Z application, or MP62131EK-LF-Z equivalent, key selection criteria include guaranteed 550–650mA current limit accuracy, 8ms FLAG deglitch timing, reverse current blocking, thermal shutdown at 140°C, and MSOP-8 package compatibility with space-constrained USB host designs.

Technical Context

The MP62131EK-LF-Z integrates a low-R_DS(ON) N-channel MOSFET with current-sense amplifier, thermal sensing circuitry, and UVLO (1.95–2.65V rising edge). Its constant-current limiting activates at ≥1.2A trip threshold under fast-ramp faults, while sustained overload triggers thermal shutdown at 140°C with 20°C hysteresis.

FLAG is an open-drain fault indicator with 8ms deglitch filtering for overcurrent events only-no deglitch applied during UVLO or thermal shutdown. The EN pin accepts CMOS/TTL logic, and output discharge engages automatically when disabled, providing 100Ω resistive path to ground for V_OUT capacitors.

Key Specifications

Pinout & Package

MP62131EK-LF-Z is housed in an 8-pin MSOP package (3.0mm × 3.0mm × 1.0mm), optimized for high-density PCB layouts in portable electronics. Pin 1 is marked with a half-circle indentation per JEDEC MO-187 AA.

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-Z, MP62055DJ-LF-Z offers higher current capacity and lower R_DS(ON) but lacks output discharge; TPL7407LDR provides channel count advantage but requires external protection circuitry and increases design complexity.

Availability

MP62131EK-LF-Z is available at Aetrix Electronics and suitable for smartphone peripheral power, USB host port switching, portable GPS power management, and industrial USB hub protection requiring stable component supply and RoHS-compliant packaging.

Supply support for MP62131EK-LF-Z 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 in the US, China, and Taiwan.

The MP62xxx series targets compact, intelligent power distribution in portable and USB-powered systems, emphasizing integrated protection, minimal external components, and robust fault handling in space-constrained environments.

FAQ

What is the function of the NC pins (4 and 5) on MP62131EK-LF-Z?

Pins 4 and 5 are internally unconnected and must remain floating-no external connection, grounding, or pulling is permitted. These pins exist for mechanical symmetry and package standardization in the MSOP-8 footprint and have no electrical role in operation or thermal performance.

Does MP62131EK-LF-Z support reverse current blocking when the input is grounded?

Yes. When IN is at GND and OUT is biased to a higher voltage (e.g., from a charged capacitor or back-fed load), the internal MOSFET body diode is reverse-biased, and the control circuit actively blocks reverse current flow-verified by <0.2µA reverse leakage at V_OUT=5.5V and VIN=GND.

How does the FLAG pin behave during thermal shutdown versus overcurrent events?

FLAG asserts low only during overcurrent events after 8ms deglitch filtering. It remains inactive (high-impedance) during thermal shutdown and UVLO-these faults do not trigger FLAG, requiring system-level temperature monitoring or supply supervision for full fault coverage.

Can MP62131EK-LF-Z be used with a 2.5V input supply?

No. The absolute minimum operating input voltage is 2.7V per datasheet specifications. At 2.5V, UVLO prevents enablement (rising-edge threshold starts at 1.95V but full functionality requires ≥2.7V), and R_DS(ON) degrades significantly due to insufficient gate drive margin.

Is the output discharge function active during UVLO conditions?

Yes. Output discharge engages whenever the device is disabled-whether by EN deassertion or input voltage dropping below UVLO threshold. This ensures safe discharge of output capacitance even during brown-out, preventing residual voltage from interfering with downstream logic or causing latch-up.

What is the maximum recommended output capacitance for stable turn-on behavior?

The datasheet validates stable operation with up to 100µF output capacitance (CL=100µF, RL=11Ω), yielding 1.8–3ms turn-on time. Larger values increase inrush stress and may exceed thermal limits during repeated switching; for >100µF, verify junction temperature rise under worst-case ambient and load conditions.