Monolithic Power Systems Inc. MP62171EK-1-LF-Z

Overview

MP62171EK-1-LF-Z from Monolithic Power Systems is a single-channel, active-high current-limited power distribution switch with 1.5A continuous load current capability, 75mΩ R_DS(ON), and 2.7V–5.5V input voltage range. It integrates thermal shutdown, under-voltage lockout, reverse current blocking, and an open-drain FLAG output with 8ms deglitch time - deployed in USB power distribution and portable device load switching where fault resilience and precise current limiting are critical.

For engineers reviewing the MP62171EK-1-LF-Z datasheet, MP62171EK-1-LF-Z pinout, MP62171EK-1-LF-Z application, or MP62171EK-1-LF-Z equivalent, key selection considerations include its active-high EN logic, guaranteed 2.3A short-circuit trip current at 25°C, MSOP-8 package thermal resistance (θ_JA = 150°C/W), and absence of external components for FLAG debouncing.

Technical Context

The MP62171EK-1-LF-Z implements a monolithic N-channel MOSFET power switch with integrated current-sense amplifier and thermal sensing circuitry. Its constant-current limiting activates at ≥2.3A (typical) during overload, transitioning to thermal shutdown only if junction temperature exceeds 140°C - with 20°C hysteresis enabling automatic recovery below ~120°C.

It features an internal charge pump for gate drive, UVLO with 1.95V rising-edge threshold and 250mV hysteresis, and a deglitched open-drain FLAG output that asserts low only after sustained overcurrent (>8ms), eliminating false triggers during transient load surges or power-up sequencing.

Key Specifications

Pinout & Package

MP62171EK-1-LF-Z is housed in an 8-pin MSOP package (3.0mm × 3.0mm × 1.1mm height) with gull-wing leads, JEDEC MO-187 AA compliant, no exposed pad. Pin 1 is marked with half-circle or full-circle indicator per package drawing.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS22965DSGR and NCP45520MUTBG, MP62171EK-1-LF-Z uniquely balances compact MSOP-8 size, integrated thermal recovery, and factory-trimmed 2.3A trip accuracy - making it optimal for space-constrained, thermally isolated portable applications requiring autonomous fault resolution.

Availability

MP62171EK-1-LF-Z is available at Aetrix Electronics and suitable for USB power distribution, smartphone peripheral switching, and notebook PC subsystem control requiring stable component supply, RoHS-compliant packaging, and long-term lifecycle support.

Supply support for MP62171EK-1-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 mixed-signal ICs for power management, motion control, and interface applications.

The MP6217x series belongs to MPS's load switch product line, engineered specifically for robust, low-footprint power rail control in portable and USB-powered electronics with integrated fault protection and minimal external components.

FAQ

What is the function of the FLAG pin, and how does its deglitching work?

The FLAG pin is an open-drain output that asserts low only after an overcurrent or thermal fault persists for ≥8ms. This internal deglitch circuit filters out transient spikes - such as inrush currents or brief shorts - preventing false fault signals. No external capacitor or resistor is needed, simplifying layout and improving reliability in noisy environments.

Does MP62171EK-1-LF-Z support reverse current blocking when disabled?

Yes. When the EN pin is low, the internal MOSFET is fully off and blocks reverse current flow from OUT to IN, with leakage <0.2µA at V_OUT = 5.5V and V_IN = GND. This eliminates the need for an external blocking diode in applications where back-powering must be prevented, such as shared power rails or battery-isolated subsystems.

How does thermal shutdown interact with current limiting?

Current limiting activates first at ~2.3A, holding output current constant. If the overload persists, power dissipation raises junction temperature. At 140°C, thermal shutdown disables the switch. Once temperature drops to ~120°C (20°C hysteresis), the device automatically recovers - unlike latch-off alternatives, enabling self-healing behavior without host intervention.

What is the minimum input voltage required for reliable operation?

The under-voltage lockout (UVLO) circuit disables the switch until input voltage rises above 1.95V (typical), with 250mV hysteresis. Below this threshold, EN is ignored and OUT remains off. This ensures stable gate drive and accurate current limiting only when VIN is sufficient - critical for battery-powered systems nearing end-of-discharge.

Can MP62171EK-1-LF-Z be used with 3.3V logic control signals?

Yes. The EN pin accepts TTL- and CMOS-compatible logic: a high level ≥2.0V enables the switch, and a low level ≤0.8V disables it. With typical V_OH > 2.4V from 3.3V GPIOs, it interfaces directly with microcontrollers, PMICs, or baseband processors without level-shifting circuitry.

Is there any difference between MP62171EK and MP62171EK-1-LF-Z?

MP62171EK-1-LF-Z is the RoHS-compliant, tape-and-reel packaged version of MP62171EK: "-LF" denotes lead-free finish, and "-Z" indicates tape-and-reel packaging. Electrically and functionally identical, the suffixes reflect environmental compliance and logistics format - both share identical MSOP-8 footprint, pinout, and electrical specifications.