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

Overview

MP62171EK-1-LF-P 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 output with 8ms deglitch for USB VBUS power control in portable electronics.

For engineers reviewing the MP62171EK-1-LF-P datasheet, MP62171EK-1-LF-P pinout, MP62171EK-1-LF-P application, or MP62171EK-1-LF-P equivalent, key selection criteria include guaranteed 1.5A current limit accuracy, SOIC8/MSOP8 package compatibility, active-high enable logic, thermal recovery at ~120°C, and absence of power-up FLAG glitches-critical for hot-swap and USB power delivery integrity.

Technical Context

The MP62171EK-1-LF-P implements a precision current-limiting architecture using internal MOSFET sensing and charge-pump gate drive to maintain constant-current mode during overloads (trip threshold 2.3A typ). Its UVLO circuit activates at 1.95V rising edge with 250mV hysteresis, ensuring stable startup above minimum supply.

Thermal protection operates independently of current limiting: junction temperature is monitored continuously, triggering shutdown at 140°C with 20°C hysteresis. The open-drain FLAG pin asserts low after 8ms deglitched detection of over-current or UVLO fault, eliminating external filtering components.

Key Specifications

Pinout & Package

MP62171EK-1-LF-P is housed in an 8-pin MSOP package (3.0mm × 3.0mm, 0.65mm pitch) with exposed pad omitted. Pin functions are validated per MPS Rev.0.9 datasheet and match MSOP8 pinout orientation.

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 AP22653W-7, MP62171EK-1-LF-P uniquely combines 8ms deglitch, 20°C thermal hysteresis, and no-power-up FLAG glitches-enabling robust USB and portable device power control without external timing or filtering components.

Availability

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

Supply support for MP62171EK-1-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, with design centers in the US, China, and Taiwan.

The MP6217x series belongs to MPS's load switch product line, engineered specifically for USB, portable, and embedded systems requiring accurate current limiting, integrated fault reporting, and thermal resilience in compact MSOP8/SOIC8 packages.

FAQ

What is the maximum allowable continuous current for MP62171EK-1-LF-P at 85°C ambient?

The MP62171EK-1-LF-P delivers 1.5A continuous current up to +85°C ambient in its MSOP8 package, validated by thermal resistance (θ_JA = 150°C/W) and derating curves in the datasheet. At higher temperatures, current must be reduced linearly to maintain junction temperature below 125°C operating limit.

Does MP62171EK-1-LF-P require an external pull-up resistor on the FLAG pin?

Yes-FLAG is an open-drain output and requires an external pull-up resistor (typically 10kΩ to 5V or VCC) to generate a valid logic-high signal when no fault is present. The datasheet specifies FLAG sink capability of 5mA at 0.4V, confirming compatibility with standard logic interfaces.

How does the 8ms FLAG deglitch function interact with thermal shutdown events?

The 8ms deglitch applies only to over-current and UVLO faults; it is bypassed during thermal shutdown. FLAG asserts immediately upon thermal trip detection, enabling rapid system-level thermal response without delay-critical for preventing irreversible die damage.

Can MP62171EK-1-LF-P safely drive capacitive loads exceeding 100µF?

Yes-the device supports output capacitance up to 1000µF, with measured turn-on time of 3ms (CL=100µF) and soft-start behavior limiting inrush. For >100µF, ensure input supply can sustain peak charge current and verify V_IN droop remains within UVLO threshold.

Is reverse current blocking active when EN is low?

Yes-reverse current blocking is inherent to the internal MOSFET structure and remains fully functional when EN is low or the device is unpowered. This prevents backfeed from OUT to IN even with zero bias, protecting upstream sources like batteries or shared rails.

What is the recommended input capacitor value for stable operation?

MPS recommends ≥10µF ceramic capacitor between IN and GND, placed as close as possible to pins 1–3. This suppresses input transients, improves immunity to short-circuit ringing, and stabilizes the internal charge pump-verified in application circuit Figure 3 and layout guidelines.