Monolithic Power Systems Inc. MP62171EK-LF-P

Overview

MP62171EK-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 pin with 8ms deglitch time for reliable USB power distribution in portable electronics.

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

Technical Context

The MP62171EK-LF-P implements a current-sense amplifier and charge pump to maintain precise constant-current regulation during overloads, transitioning into thermal shutdown only after sustained fault conditions exceed junction temperature limits (140°C). Its UVLO circuit enforces operation only above 1.95V (rising edge) with 250mV hysteresis.

FLAG output is open-drain with 8ms deglitch filtering to suppress false fault reporting during transient overloads, while reverse current blocking prevents backflow when V_OUT > V_IN. The device supports fast turn-on (3ms) and turn-off (10ms) times with controlled slew rates to minimize inrush stress on downstream capacitive loads.

Key Specifications

Pinout & Package

MP62171EK-LF-P is housed in an 8-pin MSOP package (3.0mm × 3.0mm × 1.0mm height) with standard JEDEC MO-187, variation AA footprint and no exposed pad. Pin pitch is 0.65mm; lead coplanarity ≤ 0.10mm.

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 AP22653AW5-7, MP62171EK-LF-P offers balanced trade-offs: integrated reverse blocking without external components, industry-standard MSOP-8 footprint, and deterministic 8ms FLAG response-making it optimal for space-constrained USB and portable designs where fault immunity and layout simplicity are critical.

Availability

MP62171EK-LF-P 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 industrial availability.

Supply support for MP62171EK-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 robust, low-footprint power distribution in portable and USB-powered systems requiring accurate current limiting and autonomous fault handling.

FAQ

What is the maximum allowable input voltage for MP62171EK-LF-P?

The absolute maximum IN voltage is +6.0V, but the recommended operating range is 2.7V to 5.5V. Operation above 5.5V risks permanent damage due to exceeding oxide breakdown limits in the internal MOSFET and control circuitry, even briefly.

Does MP62171EK-LF-P support reverse current blocking during disable state?

Yes - the device blocks reverse current flow from OUT to IN when disabled (EN = low) or when V_OUT > V_IN, verified by ≤0.2µA reverse leakage at V_OUT = 5.5V and V_IN = GND per datasheet Section 3.

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

FLAG asserts low after 8ms deglitch timeout for both overcurrent and thermal faults. However, during thermal shutdown, FLAG remains asserted until junction temperature falls below 120°C - unlike overcurrent, which clears immediately upon load removal if thermal limit is not reached.

Can MP62171EK-LF-P be used with 3.3V logic-level microcontrollers?

Yes - EN accepts TTL/CMOS logic levels: V_IH ≥ 2.0V and V_IL ≤ 0.8V. A 3.3V GPIO meets these thresholds with margin, and EN input leakage is ≤1µA, minimizing drive burden on MCU pins.

What is the thermal resistance (θ_JA) of the MSOP-8 package under standard JEDEC 4-layer PCB conditions?

θ_JA is 150°C/W for the MSOP-8 package, measured per JESD51-7 on a 4-layer board. This value assumes standard copper pour and land pattern per MPS recommended layout - actual performance degrades significantly with reduced copper area or no thermal vias.

Is there a minimum output capacitance requirement for stable operation?

No minimum is specified, but MPS recommends ≥10µF at IN and high-value electrolytic capacitance at OUT for heavy loads to dampen transients and reduce V_OUT droop during inrush. Output capacitance does not affect FLAG timing or current-limit accuracy.

How does under-voltage lockout (UVLO) interact with EN pin activation?

UVLO operates independently of EN: if VIN drops below 1.95V (rising edge), the device disables regardless of EN state and FLAG may assert. EN can only enable the switch when VIN is within valid UVLO window - preventing partial turn-on during brown-out.