Monolithic Power Systems Inc. MP62171EK-LF-Z

Overview

MP62171EK-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 operation across 2.7V–5.5V input range. It integrates thermal shutdown, under-voltage lockout, reverse current blocking, and an open-drain FLAG pin with 8ms deglitch for reliable USB power distribution in portable electronics.

For engineers reviewing the MP62171EK-LF-Z datasheet, MP62171EK-LF-Z pinout, MP62171EK-LF-Z application, or MP62171EK-LF-Z equivalent, key selection criteria include guaranteed 1.5A current limit accuracy, MSOP-8 package thermal performance (θ_JA = 150°C/W), active-high enable logic, and FLAG response timing under short-circuit transients.

Technical Context

The MP62171EK-LF-Z implements a precision current-limit architecture using internal sense-FET feedback to enforce constant-current mode at ≥2.3A trip threshold during overload, while maintaining <75mΩ on-resistance across -20°C to +85°C ambient. Its UVLO circuit activates at 1.95V rising edge with 250mV hysteresis to prevent erratic turn-on during brownout.

Thermal protection triggers at 140°C junction temperature with 20°C hysteresis, forcing automatic shutdown until die cools to ~120°C; the open-drain FLAG pin asserts low after 8ms deglitch only for sustained overcurrent-not during power-up or UVLO events-ensuring noise-immune fault reporting.

Key Specifications

Pinout & Package

MP62171EK-LF-Z is housed in an 8-pin MSOP package (3.0mm × 3.0mm × 1.0mm height) with exposed thermal pad omitted per datasheet revision 0.9. The package supports standard reflow profiles and delivers θ_JA = 150°C/W on a 4-layer JEDEC-compliant PCB.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS22965DRLR and AP22653W5-7, MP62171EK-LF-Z uniquely balances 1.5A precision current limiting, integrated 8ms-deglitched FLAG, and 75mΩ R_DS(on) in a thermally optimized MSOP-8 footprint-making it optimal for USB-compliant systems requiring autonomous fault management without external components.

Availability

MP62171EK-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 tape-and-reel delivery for automated assembly.

Supply support for MP62171EK-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 MP6217x series belongs to MPS's load switch product line, engineered specifically for robust, low-footprint power distribution in space-constrained portable electronics where current limiting, thermal safety, and fault visibility are critical.

FAQ

What is the exact thermal shutdown threshold and hysteresis of MP62171EK-LF-Z?

The MP62171EK-LF-Z triggers thermal shutdown at 140°C junction temperature with 20°C hysteresis, meaning it automatically recovers once the die cools to approximately 120°C. This behavior is verified across production lots and specified in the Absolute Maximum Ratings table; no external thermal sensor or host polling is required for safe operation.

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

Yes, MP62171EK-LF-Z provides true reverse current blocking: when EN is low and VIN = GND, reverse leakage from OUT to IN is limited to 0.2µA maximum at 5.5V. This eliminates the need for an external blocking diode in applications like USB OTG or dual-power-source systems where backfeed must be prevented.

How does the FLAG pin behave during power-up and UVLO conditions?

The FLAG pin remains high-impedance (not asserted) during power-up and under-voltage lockout-no deglitch filtering is applied in those states. It only pulls low after an 8ms deglitch timeout when overcurrent or thermal shutdown occurs during normal operation, ensuring no false fault signals during system initialization or brownout recovery.

What is the recommended input capacitance for stable operation?

A minimum 10µF ceramic capacitor between IN and GND is recommended per the datasheet to suppress input transients and improve immunity to short-circuit ringing. For heavy output loads, adding a bulk electrolytic capacitor (e.g., 100µF) at the OUT pins further stabilizes voltage during step-load transitions.

Can MP62171EK-LF-Z drive multiple parallel loads from its three OUT pins?

Yes-the three OUT pins (6, 7, 8) are internally bonded together and rated for combined 1.5A continuous current. They are intended to be connected in parallel on the PCB to reduce trace resistance and improve current sharing; no external balancing components are needed due to monolithic construction.

Is the EN pin compatible with 1.8V logic microcontrollers?

No-EN requires ≥2.0V to register as logic high per Electrical Characteristics table. Driving it directly from a 1.8V GPIO may result in unreliable turn-on; a level shifter or pull-up to ≥2.7V is required for compatibility with low-voltage I/O domains.