Monolithic Power Systems Inc. MP62171ES-1-LF-Z

Overview

MP62171ES-1-LF-Z from Monolithic Power Systems is a single-channel, active-high enable, 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 pin with 8ms deglitch for USB power distribution and portable device load switching.

For engineers reviewing the MP62171ES-1-LF-Z datasheet, MP62171ES-1-LF-Z pinout, MP62171ES-1-LF-Z application, or MP62171ES-1-LF-Z equivalent, key selection criteria include guaranteed 1.5A current limit accuracy, SOIC8 package thermal performance (θ_JA = 90°C/W), active-high EN logic compatibility with USB VBUS control, and FLAG response timing for fault isolation in hot-swap systems.

Technical Context

The MP62171ES-1-LF-Z implements a precision current-limiting architecture using internal MOSFET sensing and charge-pump gate drive to maintain constant-current mode at 2.3A typical short-circuit trip level. Its UVLO threshold (2.65V max) ensures clean startup above minimum system rail stability.

Thermal protection activates at 140°C junction temperature with 20°C hysteresis, enabling automatic recovery once die temperature drops below ~120°C. The FLAG pin provides asynchronous, deglitched overcurrent reporting without external RC filtering-critical for deterministic fault handling in USB and PC Card applications.

Key Specifications

Pinout & Package

MP62171ES-1-LF-Z is housed in an 8-pin SOIC package (JEDEC MS-012, variation AA) with standard 1.27mm pitch, no exposed pad, and 90°C/W junction-to-ambient thermal resistance. Pin 1 marked with half-circle indentation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS2051BDBVR and NCP45520MUTBG, MP62171ES-1-LF-Z uniquely combines integrated FLAG reporting, precise 2.3A trip accuracy, and active-high EN in a standard SOIC8-making it optimal for USB-compliant systems requiring deterministic fault logging and minimal layout changes.

Availability

MP62171ES-1-LF-Z is available at Aetrix Electronics and suitable for USB power distribution, smartphone peripheral switching, notebook PC subsystem control, and PC Card hot-swap applications requiring stable component supply across industrial temperature ranges and long-term production cycles.

Supply support for MP62171ES-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 automotive applications.

The MP6217x series belongs to MPS's load switch product line, designed specifically for robust, current-limited power gating in portable and USB-enabled systems where reliability, small footprint, and diagnostic capability are critical.

FAQ

What is the maximum allowable continuous current for MP62171ES-1-LF-Z at +85°C ambient?

The MP62171ES-1-LF-Z guarantees 1.5A continuous load current across –20°C to +85°C ambient temperature. At +85°C in SOIC8 package, thermal derating begins above this value due to θ_JA = 90°C/W; sustained operation beyond 1.5A risks thermal shutdown activation unless board-level heatsinking is added.

Does MP62171ES-1-LF-Z support reverse current blocking during shutdown?

Yes. With VIN = GND and VOUT = 5.5V, reverse leakage current is specified at 0.2µA max. This feature prevents backflow from powered downstream loads into the source rail, protecting upstream regulators and enabling safe multi-rail sequencing in portable systems.

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

The FLAG pin remains high-impedance (not pulled low) during power-up and under UVLO-no deglitching is applied in these states. It only asserts low after 8ms following detection of overcurrent or thermal shutdown, ensuring no false faults during system initialization or brownout events.

Can MP62171ES-1-LF-Z be used with 3.3V input supply?

Yes. Its 2.7V–5.5V input range fully supports 3.3V operation. At 3.3V, typical current limit remains 2.3A, R_DS(on) increases slightly to 130mΩ max, and turn-on time extends to 1.7ms-still within specification for most 3.3V I/O domain load-switching applications.

Is there a recommended input capacitor value for stable operation?

MPS recommends ≥10µF ceramic or tantalum capacitance between IN and GND. This reduces input transients, improves immunity to short-circuit ringing, and stabilizes the internal charge pump-especially critical when driving capacitive loads exceeding 100µF on the OUT pins.

What is the thermal shutdown hysteresis and how does recovery work?

Thermal shutdown triggers at 140°C with 20°C hysteresis, meaning the device remains off until junction temperature falls to approximately 120°C. Recovery is fully autonomous-no external reset or EN toggling is required-enabling graceful self-recovery after transient overloads or poor airflow conditions.

Does MP62171ES-1-LF-Z require external components for basic operation?

No. The device operates stand-alone with only IN, GND, EN, and OUT connections. The FLAG pin requires a pull-up resistor (typically 10kΩ) for proper open-drain logic interfacing, but no external timing, filtering, or current-sense resistors are needed-reducing BOM count and PCB area.