Monolithic Power Systems Inc. MP62131EK-LF

Overview

MP62131EK-LF from Monolithic Power Systems is a single-channel, active-high enable current-limited power distribution switch designed 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, and integrates output discharge, thermal shutdown, and under-voltage lockout - deployed in smartphone USB power rails and portable GPS power management.

For engineers reviewing the MP62131EK-LF datasheet, MP62131EK-LF pinout, MP62131EK-LF application, or MP62131EK-LF equivalent, key selection criteria include guaranteed 500mA current limit accuracy, 8ms FLAG deglitch timing, reverse current blocking, and MSOP8 package thermal performance at 150°C/W θ_JA.

Technical Context

The MP62131EK-LF implements a thermally protected N-channel MOSFET power switch with integrated current-sense amplifier and deglitched open-drain FLAG output. Its constant-current limiting activates at ≥550mA (typ. 650mA), transitioning to thermal shutdown only if sustained overload raises junction temperature beyond 140°C.

It features active-high EN logic compatible with CMOS/TTL, UVLO with 2.3V rising threshold and 250mV hysteresis, and an internal 100Ω discharge path activated during disable or UVLO - eliminating external discharge components in USB port designs.

Key Specifications

Pinout & Package

MP62131EK-LF is housed in an 8-pin MSOP package (3.0mm × 3.0mm × 1.0mm height) with exposed thermal pad, optimized for high-density portable PCB layouts and thermal dissipation (θ_JA = 150°C/W on 4-layer board).

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, MP62131EK-LF uniquely balances 500mA precision current limiting, integrated 100Ω discharge, MSOP8 size, and 90mΩ conduction loss - making it optimal for space-constrained USB and portable power rail applications where BOM reduction and thermal reliability are prioritized.

Availability

MP62131EK-LF is available at Aetrix Electronics and suitable for smartphone USB power switching, portable GPS power management, set-top box peripheral port control, and USB hub power distribution requiring stable component supply and RoHS-compliant packaging.

Supply support for MP62131EK-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, headquartered in California and serving global power management markets since 1997.

The MP6213x series belongs to MPS's load switch product line, engineered specifically for portable and USB-compliant power distribution with integrated protection, low quiescent current, and minimal external component count.

FAQ

What is the logic polarity of the EN pin on MP62131EK-LF?

The EN pin on MP62131EK-LF is active-high: the switch turns ON when EN voltage exceeds 2.0V (min), and OFF when EN falls below 0.8V (max). This differs from MP62130EK-LF, which uses active-low EN - confirmed in the ordering table and pin function description.

Does MP62131EK-LF support reverse current blocking?

Yes - MP62131EK-LF provides reverse current blocking: when IN is at GND or unpowered and OUT is biased high (e.g., from a charged capacitor), leakage is limited to 0.2µA (max), preventing backfeed into the input rail per electrical characteristics table.

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

FLAG asserts low after 8ms deglitch delay for overcurrent events, but responds immediately (no deglitch) during thermal shutdown or UVLO activation - enabling distinct fault diagnosis via timing analysis of the FLAG signal pulse width.

What is the maximum allowable output capacitance for stable turn-on without oscillation?

No hard upper limit is specified, but the datasheet recommends CL ≤ 100µF for controlled turn-on time (Ton = 1.8–3ms). For larger capacitors (e.g., >470µF), inrush current may exceed trip threshold unless slew rate is limited externally - verified in typical performance curves Figure 6.

Can MP62131EK-LF operate from a 3.3V supply to drive a 3.3V load?

Yes - its 2.7V to 5.5V input range fully supports 3.3V operation. At VIN = 3.3V, R_DS(ON) remains ≤130mΩ (max) across –20°C to +85°C, delivering ≥450mA continuous current before thermal limits intervene, per electrical characteristics and thermal resistance data.

Is the MSOP8 package of MP62131EK-LF lead-free and RoHS-compliant?

Yes - the "-LF" suffix explicitly denotes lead-free and RoHS-compliant construction. The package uses matte tin lead finish and meets JEDEC MO-187AA standards, with peak reflow temperature rated to 260°C per absolute maximum ratings.

What happens to the output during UVLO condition?

When input voltage drops below 1.95V (UVLO falling threshold), the switch disables regardless of EN state, and the internal 100Ω discharge path activates to safely bleed charge from the output capacitor - confirmed in DETAILED DESCRIPTION section and functional block diagram.