Monolithic Power Systems Inc. MP62055EJ-LF-Z

Overview

MP62055EJ-LF-Z from Monolithic Power Systems is a single-channel, active-high, current-limited power distribution switch with 500mA continuous load current capability, 115mΩ R_DS(on), and operation across 2.7V–5.5V input range. It integrates over-current protection with 1.1A trip threshold, thermal shutdown at 140°C, and reverse current blocking-used in USB power rails and portable device load switching.

For engineers reviewing the MP62055EJ-LF-Z datasheet, MP62055EJ-LF-Z pinout, MP62055EJ-LF-Z application, or MP62055EJ-LF-Z equivalent, key selection criteria include guaranteed current limit accuracy, 8ms FLAG deglitch timing, UVLO thresholds (1.95V rise), thermal hysteresis (20°C), and TSOT23-5 package compatibility with space-constrained PCB layouts.

Technical Context

The MP62055EJ-LF-Z implements a thermally protected N-channel MOSFET switch with internal current-sense and constant-current limiting logic. Its enable-controlled architecture supports TTL/CMOS-compatible EN input, while the open-drain FLAG pin reports over-current after an 8ms deglitch window-excluding UVLO and thermal events from deglitching.

It features under-voltage lockout (1.95V to 2.65V rising edge), reverse current blocking during disable, and thermal shutdown with 20°C hysteresis. The device transitions to constant-current mode upon exceeding 550mA (min) trip current, sustaining up to 1.1A short-circuit current before thermal cutoff.

Key Specifications

Pinout & Package

MP62055EJ-LF-Z is housed in a 5-pin TSOT23-5 package (2.9mm × 1.6mm × 0.9mm), optimized for high-density portable PCBs with exposed thermal pad (not electrically connected).

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 AP22653W5-7, MP62055EJ-LF-Z uniquely combines autonomous thermal shutdown, deglitched FLAG reporting, and reverse current blocking in a TSOT23-5 footprint-making it optimal for compact, safety-aware USB and portable power applications.

Availability

MP62055EJ-LF-Z is available at Aetrix Electronics and suitable for smartphone power rail switching, USB 2.0 host port protection, and portable GPS receiver power management requiring stable component supply across production lifecycles.

Supply support for MP62055EJ-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 MP62055 belongs to MPS's power distribution switch product line, engineered for reliable, space-efficient load control in battery-powered and USB-compliant consumer electronics.

FAQ

What is the maximum allowable input voltage for MP62055EJ-LF-Z?

The absolute maximum input voltage (IN) is +6V. Operation beyond this risks permanent damage. The recommended functional range is 2.7V to 5.5V, covering standard 3.3V and 5V system rails. Exceeding 5.5V may trigger internal overvoltage stress even if within absolute max ratings.

Does MP62055EJ-LF-Z support reverse current blocking during disable?

Yes. When disabled (EN = low), the internal MOSFET blocks reverse current flow from OUT to IN, measured at ≤0.2μA at 5.5V reverse bias. This prevents backfeeding into shared input supplies-a critical feature in multi-rail portable devices.

How does the FLAG pin behave during thermal shutdown versus over-current events?

The FLAG pin asserts low only after an 8ms deglitch timeout for over-current events. It does not deglitch during thermal shutdown or UVLO-meaning it responds immediately to those faults. This allows differentiated fault diagnosis: sustained FLAG assertion indicates thermal overload, while delayed assertion points to current-limit activation.

What is the typical turn-on time and what factors influence it?

Typical turn-on time (Ton) is 3ms with 100μF output capacitance and 11Ω load. It scales with output capacitance and load resistance. Higher C_OUT increases rise time; heavier loads reduce slew rate. Input voltage has minor effect-measured at 2.7V and 5.5V with <10% variation.

Is an input capacitor required, and what value is recommended?

Yes. A minimum 10μF ceramic capacitor between IN and GND is recommended to suppress input transients and improve immunity to short-circuit-induced ringing. Larger values (e.g., 22μF) further stabilize input during heavy load switching, especially in noisy DC-DC environments.

Can MP62055EJ-LF-Z be used in automotive applications?

No. Its specified operating ambient temperature range is –40°C to +85°C, and junction temperature limit is +125°C-insufficient for AEC-Q100 Grade 2 (–40°C to +105°C ambient) or Grade 1 requirements. It is qualified for commercial and industrial portable electronics only.

What is the significance of the "6G" top marking on the TSOT23-5 package?

"6G" is the manufacturer's wafer lot and assembly traceability code for MP62055EJ variants. It is not a functional identifier and does not correlate with electrical specs or revision level. Full part number (MP62055EJ-LF-Z) must be used for ordering and documentation.