Monolithic Power Systems Inc. MP62351EK-LF

Overview

MP62351EK-LF from Monolithic Power Systems is a dual-channel, active-high current-limited power distribution switch with 500mA continuous load current per channel, 85mΩ R_DS(on), and integrated output discharge (100Ω path). It operates from 2.7V to 5.5V input and delivers overcurrent protection via constant-current limiting (typ. 750mA short-circuit trip) and thermal shutdown (140°C), used in USB power distribution and portable device rail switching.

For engineers reviewing the MP62351EK-LF datasheet, MP62351EK-LF pinout, MP62351EK-LF application, or MP62351EK-LF equivalent, key selection criteria include dual-channel enable logic compatibility, guaranteed current limit accuracy, FLAG deglitch timing (8ms), reverse current blocking, and MSOP-8 thermal performance (θ_JA = 150°C/W).

Technical Context

The MP62351EK-LF integrates two independent N-channel MOSFET power switches with matched current-limit circuitry, UVLO (2.65V rising threshold), and open-drain FLAG outputs for each channel. Each channel features independent EN control, slew-rate-limited turn-on (3ms typical), and output discharge activated upon disable.

Its protection architecture combines fast-response current sensing (trip within microseconds), thermal shutdown with 20°C hysteresis, and under-voltage lockout to prevent erratic operation during brownout. The charge-pump gate driver ensures full enhancement of internal MOSFETs across the 2.7–5.5V input range.

Key Specifications

Pinout & Package

MP62351EK-LF is housed in an 8-pin MSOP package (3.0mm × 3.0mm × 1.0mm height), optimized for space-constrained portable designs and offering θ_JA = 150°C/W on standard 4-layer PCBs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TUSB2036IPW and TPS2051BDBVR, MP62351EK-LF uniquely delivers dual independent channels in one MSOP-8 package with guaranteed 100Ω discharge, 8ms deglitch, and reverse current blocking-enabling compact, hot-swap-safe rail control without protocol overhead or channel duplication.

Availability

MP62351EK-LF is available at Aetrix Electronics and suitable for smartphone USB power switching, notebook PC subsystem rail control, and set-top box peripheral management requiring stable component supply, RoHS-compliant packaging, and long-term industrial availability.

Supply support for MP62351EK-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 design centers in the US, China, and Taiwan, and global manufacturing partnerships.

The MP6235x series targets portable and embedded power management, delivering integrated current limiting, thermal protection, and output discharge in ultra-small packages for space- and reliability-critical applications.

FAQ

What is the maximum allowable input voltage for MP62351EK-LF?

The absolute maximum input voltage (IN) is +6.0V, but the recommended operating range is 2.7V to 5.5V. Operation above 5.5V risks permanent damage, and UVLO ensures functional operation only above 1.95V (rising edge). Sustained use beyond 5.5V violates SOA limits and voids reliability guarantees.

Does MP62351EK-LF support reverse current blocking when IN is unpowered?

Yes. The internal MOSFET structure provides inherent reverse current blocking: when IN = 0V and OUTx is biased to 5.5V, reverse leakage is limited to 0.2µA (max), preventing backfeed into the main supply rail and protecting upstream sources in multi-power-domain systems.

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

FLAG asserts low after an 8ms deglitch delay for overcurrent events only. During thermal shutdown or UVLO, FLAG is not deglitched and responds immediately (no delay), allowing rapid system-level fault detection for temperature-critical conditions.

Can MP62351EK-LF drive a 100µF output capacitor without instability?

Yes. The device specifies turn-off time of 10ms with CL = 100µF and RL = 11Ω, and includes built-in slew-rate control. No external compensation is needed, but a minimum 10µF ceramic capacitor at IN is required to maintain stability during short-circuit transients.

What is the thermal resistance (θ_JA) of the MSOP-8 package under standard layout conditions?

θ_JA is 150°C/W when mounted on a 4-layer JEDEC-standard PCB (JESD51-7). This value assumes 1in² copper pour per layer under the package; reducing copper area increases junction temperature and may trigger thermal shutdown at lower ambient temperatures or load currents.

Is the output discharge path active during UVLO or thermal shutdown?

Yes. The 100Ω discharge path remains active whenever EN1 or EN2 is low (disabled state), regardless of whether the device is in UVLO, thermal shutdown, or normal operation-ensuring safe output discharge even during fault conditions.

What logic family compatibility does the EN input support?

EN inputs are compatible with both CMOS and TTL logic families: logic high threshold is ≥2.0V, logic low threshold is ≤0.8V, and input leakage is ≤1µA. This allows direct interfacing with 1.8V, 3.3V, and 5V microcontrollers without level-shifting circuitry.