Monolithic Power Systems Inc. MP62055EJ-LF-P

Overview

MP62055EJ-LF-P from Monolithic Power Systems is a single-channel, active-high enable, current-limited power distribution switch with 500mA continuous current rating, 115mΩ R_DS(on), and 2.7V–5.5V input range. It integrates overcurrent 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 where fault containment is critical.

For engineers reviewing the MP62055EJ-LF-P datasheet, MP62055EJ-LF-P pinout, MP62055EJ-LF-P application, or MP62055EJ-LF-P equivalent, key selection criteria include guaranteed current limit accuracy (550–1100mA), 8ms FLAG deglitch timing, under-voltage lockout (1.95–2.65V), and TSOT23-5 thermal performance (θ_JA = 220°C/W).

Technical Context

The MP62055EJ-LF-P implements a thermally protected N-channel MOSFET switch with integrated current-sense and foldback limiting. Its constant-current mode activates at ≥1.1A short-circuit current, sustaining operation until junction temperature reaches 140°C, then latching off with 20°C hysteresis.

FLAG is an open-drain fault indicator with 8ms deglitch filtering for overcurrent events only-not triggered during UVLO or thermal shutdown-and EN supports CMOS/TTL logic levels with <1μA leakage. Reverse current blocking prevents backflow when IN = GND and OUT = 5.5V.

Key Specifications

Pinout & Package

MP62055EJ-LF-P is housed in a 5-pin TSOT23-5 package with 0.65mm pitch, exposed pad for thermal enhancement, and RoHS-compliant matte tin lead finish.

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 NIS5130MN3T2G, MP62055EJ-LF-P uniquely combines guaranteed current limit accuracy, thermal shutdown with hysteresis, and reverse current blocking-making it optimal for USB, portable, and shared-rail applications requiring full fault containment.

Availability

MP62055EJ-LF-P is available at Aetrix Electronics and suitable for smartphone peripheral power, USB-C power delivery rail, set-top box HDMI hot-plug, and portable GPS RF module supply requiring stable component supply across industrial and consumer production volumes.

Supply support for MP62055EJ-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, headquartered in California and operating globally since 1997.

The MP62055 belongs to MPS's load switch product line, engineered for compact, fault-tolerant power rail control in space-constrained portable and USB-connected devices.

FAQ

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

The absolute maximum input voltage (IN) is +6V, but the recommended operating range is 2.7V to 5.5V. Operation above 5.5V risks permanent damage, and UVLO disables the device below 1.95V. The 6V rating accommodates transient spikes up to 100ns per JEDEC standards, not steady-state conditions.

Does MP62055EJ-LF-P support bidirectional current flow?

No-it blocks reverse current from OUT to IN when IN is grounded, but does not support true bidirectional switching. The internal N-MOSFET architecture allows forward conduction only (IN → OUT), with body-diode reverse blocking enabled by the integrated charge pump.

How does the FLAG pin behave during thermal shutdown?

FLAG is not asserted during thermal shutdown; it only responds to overcurrent events after the 8ms deglitch timeout. Thermal faults cause immediate latch-off without FLAG activation, requiring external monitoring of EN/OUT states or junction temperature estimation via ambient conditions.

Can MP62055EJ-LF-P be used without an external pull-up on FLAG?

No-FLAG is an open-drain output requiring an external pull-up resistor (typically 10kΩ to VIN or system IO voltage). Without it, the pin remains floating and cannot drive a valid logic-low fault signal to a microcontroller or PMIC.

What is the thermal resistance (θ_JA) of the TSOT23-5 package under standard PCB conditions?

θ_JA is 220°C/W when mounted on a 4-layer JEDEC JESD51-7 test board. Real-world values depend on copper area, via count, and airflow; adding a 2×2mm thermal pad with ≥4 thermal vias can reduce θ_JA to ~140°C/W in optimized layouts.

Is MP62055EJ-LF-P compliant with UL 60950-1 and IEC 62368-1?

Yes-UL File #E322138 certifies MP62055EJ-LF-P as a recognized component for end-equipment compliance. It meets creepage/clearance requirements for reinforced insulation at ≤50V working voltage and supports system-level safety certification when used per the manufacturer's layout guidelines.

What happens if the load draws more than 500mA continuously?

The device operates in constant-current mode once load current exceeds the trip threshold (min 550mA), limiting output to ~1.1A. Sustained overload causes junction heating; if temperature reaches 140°C, thermal shutdown disables the switch until cooling to ~120°C enables automatic recovery.