Monolithic Power Systems Inc. MP62131ES-LF-Z

Overview

MP62131ES-LF-Z from Monolithic Power Systems is a single-channel, active-high enable current-limited power distribution switch optimized for USB VBUS and portable load switching. It delivers 500mA continuous current with 90mΩ R_DS(ON), operates from 2.7V to 5.5V input, includes output discharge (100Ω path), thermal shutdown at 140°C, and open-drain FLAG reporting with 8ms deglitch - deployed in smartphone USB port power control.

For engineers reviewing the MP62131ES-LF-Z datasheet, MP62131ES-LF-Z pinout, MP62131ES-LF-Z application, or MP62131ES-LF-Z equivalent, key selection criteria include guaranteed 550–650mA current limit accuracy, active-high EN logic compatibility with 5V-tolerant GPIO, SOIC8 thermal performance (θ_JA = 90°C/W), and integrated reverse-current blocking without external components.

Technical Context

The MP62131ES-LF-Z integrates a low-R_DS(ON) N-channel MOSFET with precision current-sense amplifier and thermal feedback loop. Its constant-current limiting activates at ≥550mA (typ. 650mA) under overload, transitioning to thermal shutdown only if sustained short-circuit heating raises junction temperature to 140°C.

It features under-voltage lockout (UVLO) with 2.3V rising threshold and 250mV hysteresis, ensuring clean startup above minimum supply; the 8ms FLAG deglitch prevents false fault reporting during transient overloads, while output discharge engages automatically upon disable or UVLO entry.

Key Specifications

Pinout & Package

MP62131ES-LF-Z is supplied in an 8-pin SOIC package (body width 3.9mm, JEDEC MS-012 AA compliant) with standard 1.27mm pitch. Thermal resistance θ_JA = 90°C/W enables 1.4W continuous dissipation at +25°C ambient.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar current-limited power distribution switch applications.

Compared with MP62131ES-LF-Z, MP62055ES-LF-Z offers higher current capacity and wider temperature range while maintaining identical pinout and control interface; TPS22965DRLR trades integrated protection features for raw current capability and requires additional external components for equivalent functionality.

Availability

MP62131ES-LF-Z is available at Aetrix Electronics and suitable for smartphone USB port control, portable GPS power management, and set-top box peripheral isolation requiring stable component supply and legacy design continuity.

Supply support for MP62131ES-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-efficiency analog and power ICs, with core expertise in DC/DC conversion, LED drivers, and intelligent power switches.

The MP6213x series targets compact, thermally constrained portable electronics needing robust, integrated load switching - designed specifically to replace discrete fuse-MOSFET solutions in space-sensitive USB and battery-powered applications.

FAQ

What is the logic polarity of the EN pin on MP62131ES-LF-Z?

The EN pin on MP62131ES-LF-Z is active-high: the switch turns on when EN voltage exceeds 2.0V (min), and remains off when EN is below 0.8V (max). This differs from the MP62130 variant, which uses active-low EN logic.

Does MP62131ES-LF-Z require an external pull-up on the FLAG pin?

Yes - the FLAG pin is open-drain and requires an external pull-up resistor (typically 10kΩ to 5V or IOVDD) to generate a valid logic-high level during normal operation; absence of pull-up results in undefined or floating fault signaling.

Can MP62131ES-LF-Z safely drive a 1000µF output capacitor?

Yes - the device supports output capacitors up to 1000µF, though large values increase turn-on time (Ton ≈ 3ms max with 100µF/11Ω load); for 1000µF, ensure system timing budgets accommodate slower ramp-up and verify inrush current stays within 1.2A trip threshold.

What happens during simultaneous UVLO and overcurrent events?

UVLO takes precedence: if input voltage drops below 1.95V, the device disables regardless of load condition, turning off the switch and asserting FLAG only if overcurrent occurred *before* UVLO activation; no deglitch is applied during UVLO entry.

Is the NC pin (Pin 4 and Pin 5) electrically isolated inside the IC?

Yes - Pins 4 and 5 are confirmed no-connect terminals with no internal bonding or circuit connection; they must remain unconnected on PCB to prevent parasitic coupling, mechanical stress, or unintended thermal paths that could affect SOIC8 package reliability.

How does the output discharge function behave during thermal shutdown?

Output discharge remains active during thermal shutdown - the 100Ω internal path engages whenever EN is deasserted *or* input falls into UVLO, including during thermal fault recovery, ensuring safe bus voltage collapse even if the device is non-operational.

What is the maximum allowable power dissipation in SOIC8 at +70°C ambient?

Using θ_JA = 90°C/W and T_J(MAX) = 150°C, maximum continuous power dissipation at +70°C ambient is (150 − 70) / 90 = 0.89W; this corresponds to ~9.9A × 90mΩ = 0.89W - well above the 500mA operational limit, confirming thermal safety margin.