Monolithic Power Systems Inc. MP62171ES-1-LF

Overview

MP62171ES-1-LF from Monolithic Power Systems is a single-channel, active-high enable, current-limited power distribution switch with 75 mΩ R_DS(ON), 1.5 A continuous load current rating, and integrated thermal shutdown, UVLO, and reverse-current blocking. It operates from 2.7 V to 5.5 V input and delivers precise current limiting (typ. 2.3 A short-circuit trip) for USB power distribution in portable electronics.

For engineers reviewing the MP62171ES-1-LF datasheet, MP62171ES-1-LF pinout, MP62171ES-1-LF application, or MP62171ES-1-LF equivalent, key selection criteria include guaranteed 1.5 A continuous current delivery, 8 ms FLAG deglitch timing, SOIC8 package compatibility, and active-high EN logic for direct microcontroller interface in hot-swap and load-protection designs.

Technical Context

The MP62171ES-1-LF integrates a low-R_DS(ON) N-channel MOSFET with precision current-sense amplifier and charge-pump gate driver to maintain constant-current mode during overloads. Its internal UVLO circuit ensures operation only above 1.95 V (rising edge), with 250 mV hysteresis to prevent chatter near threshold.

Thermal protection activates at 140°C junction temperature with 20°C hysteresis, forcing output disable until die cools to ~120°C. The open-drain FLAG pin asserts low after 8 ms deglitch timeout upon overcurrent or UVLO fault, eliminating external filtering components.

Key Specifications

Pinout & Package

MP62171ES-1-LF is housed in an 8-pin SOIC package (body size 4.90 mm × 3.90 mm, 1.27 mm pitch) with standard gull-wing leads and no exposed thermal pad. Pin 1 marked by notch or circle; pin 1 corner located at top-left when notch faces up.

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 uniquely combines guaranteed 1.5 A current limit, 75 mΩ R_DS(ON), reverse-current blocking, and 8 ms deglitched open-drain FLAG in a standard SOIC8 footprint-enabling compact, robust USB and peripheral power management without supplemental components.

Availability

MP62171ES-1-LF is available at Aetrix Electronics and suitable for USB power distribution, PC Card hot swap, smartphone peripheral enable, and notebook PC subsystem control requiring stable component supply, RoHS-compliant packaging, and long-term industrial lifecycle support.

Supply support for MP62171ES-1-LF 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 core expertise in DC/DC conversion, LED drivers, and intelligent power switches.

The MP6217x series belongs to MPS's load switch product line, engineered specifically for reliable, low-footprint current-limited power distribution in portable and embedded systems where fault resilience and minimal BOM count are critical.

FAQ

What is the maximum allowable input voltage for MP62171ES-1-LF?

The absolute maximum input voltage is +6.0 V, but the recommended operating range is 2.7 V to 5.5 V. Operation above 5.5 V risks exceeding the device's safe operating area and may trigger immediate thermal shutdown or cause irreversible damage to the internal MOSFET.

Does MP62171ES-1-LF require an external pull-up resistor on the FLAG pin?

Yes. The FLAG pin is open-drain and must be pulled up to a logic-compatible voltage (e.g., 3.3 V or 5 V) via an external resistor (typically 4.7 kΩ to 10 kΩ) to generate a valid high-level signal during normal operation and a clean low-level fault indication.

How does the 8 ms FLAG deglitch time affect system fault response?

The 8 ms deglitch window ensures that only sustained overcurrent events (≥8 ms duration) assert FLAG, rejecting transient spikes from capacitive inrush or brief shorts. This eliminates false interrupts but requires host firmware to allow ≥10 ms latency between fault onset and actionable alert.

Can MP62171ES-1-LF drive multiple parallel loads simultaneously?

Yes-its three OUT pins are internally bonded to a single power switch node and rated for combined 1.5 A continuous current. However, total load capacitance must remain within limits (e.g., ≤100 µF) to ensure controlled turn-on/turn-off timing and avoid excessive inrush current triggering premature current limiting.

Is reverse-current blocking active during thermal shutdown?

Yes. Reverse-current blocking remains fully functional even when the device is thermally shut down or disabled via EN. The internal MOSFET body diode is actively blocked by control circuitry, preventing backfeed from output to input regardless of operational state.

What is the typical turn-on delay from EN assertion to 90% VOUT?

At VIN = 5.5 V with CL = 100 µF and RL = 5.5 Ω, the typical turn-on time (Ton) is 3 ms-measured from 50% EN voltage to 90% output voltage. This value scales inversely with input voltage and load resistance, ranging from 1.7 ms (VIN = 2.7 V) to 0.9 ms (VIN = 5.5 V) under light-load test conditions.

Does MP62171ES-1-LF support I²C or other digital interfaces?

No. MP62171ES-1-LF is a standalone analog power switch with only digital enable (EN) and fault flag (FLAG) signals. It contains no serial interface, programmable registers, or configurable parameters-operation is fixed per datasheet specifications.