Monolithic Power Systems Inc. MP62351EK-LF-Z

Overview

MP62351EK-LF-Z from Monolithic Power Systems is a dual-channel, active-high, current-limited power distribution switch with 500mA continuous per channel, 85mΩ R_DS(on), output discharge function, and thermal shutdown protection. It operates from 2.7V to 5.5V input and delivers precise overcurrent protection in USB power distribution and portable GPS systems.

For engineers reviewing the MP62351EK-LF-Z datasheet, MP62351EK-LF-Z pinout, MP62351EK-LF-Z application, or MP62351EK-LF-Z equivalent, key selection criteria include guaranteed 500mA current limit, dual independent enable/flag signaling, 8ms FLAG deglitch timing, reverse current blocking, and MSOP-8 thermal performance (θ_JA = 150°C/W).

Technical Context

The MP62351EK-LF-Z integrates two independent high-side MOSFET switches with matched current-limit thresholds (550–1100mA), each featuring open-drain FLAG outputs with 8ms deglitch filtering and no glitch during power-up. Its internal UVLO (1.95–2.65V rising edge) ensures clean startup under marginal supply conditions.

Thermal protection activates at 140°C with 20°C hysteresis, forcing shutdown until junction temperature falls to ~120°C; simultaneous overcurrent and thermal stress are handled independently-current limiting precedes thermal shutdown. The 100Ω integrated discharge path actively bleeds external output capacitors upon disable.

Key Specifications

Pinout & Package

MP62351EK-LF-Z is housed in an 8-pin MSOP package (3mm × 3mm, 0.65mm pitch), optimized for thermal dissipation in space-constrained portable designs (θ_JA = 150°C/W on 4-layer PCB).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MP5095DJ-LF-Z and TPS22965DSGR, MP62351EK-LF-Z uniquely delivers dual independent channels with synchronized enable/flag signaling, built-in discharge, and thermal+overcurrent co-protection-making it irreplaceable in multi-rail portable systems requiring coordinated power sequencing and fault isolation.

Availability

MP62351EK-LF-Z is available at Aetrix Electronics and suitable for USB power distribution, portable GPS devices, and notebook PC subsystems requiring stable component supply across extended production lifecycles.

Supply support for MP62351EK-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 for power conversion, motor drive, and interface applications.

The MP6235x series belongs to MPS's load switch product line, engineered specifically for portable and embedded systems demanding robust fault protection, minimal board space, and seamless integration with battery-powered architectures.

FAQ

Is MP62351EK-LF-Z pin-compatible with MP62350EK-LF-Z?

No. MP62351EK-LF-Z uses active-high enable logic (EN1/EN2 high = ON), while MP62350EK-LF-Z uses active-low enable (EN1/EN2 low = ON). Pinout and package are identical, but control logic polarity differs-direct substitution requires PCB-level signal inversion or firmware changes.

What is the maximum safe continuous current per channel at 85°C ambient?

At TA = +85°C, derating applies due to thermal limits. With θ_JA = 150°C/W and TJ(MAX) = 150°C, maximum continuous power dissipation is 433mW. At 85mΩ R_DS(on), this supports ~720mA peak-but the specified 500mA rating ensures margin across process, voltage, and temperature extremes without entering thermal shutdown.

Does the output discharge function operate when only one channel is disabled?

Yes. Each channel's 100Ω discharge path is controlled independently by its respective EN pin. Disabling EN1 activates discharge on OUT1 only; OUT2 remains unaffected unless EN2 is also deasserted. This enables selective power-down in multi-load systems.

Can FLAG1 and FLAG2 be wire-OR'd together externally?

Yes-both are open-drain outputs with identical electrical specs (V_OL ≤ 0.4V at 5mA sink). A shared pull-up resistor allows aggregated fault reporting, but individual channel diagnostics are lost. For full visibility, keep FLAG lines separate and monitor them independently.

Why is MP62351EK-LF-Z marked "Not Recommended for New Designs"?

MPS issued this notice because MP5095 offers superior specs (lower R_DS(on), higher current, smaller QFN package) and active roadmap support. MP62351EK-LF-Z remains fully qualified and available for legacy design refreshes and existing production, with no announced obsolescence date.

What is the minimum recommended input capacitance for stable operation?

MPS specifies ≥10µF ceramic or tantalum capacitor between IN and GND. This stabilizes the input rail during load transients and short-circuit events, reducing ringing and improving immunity to fast current surges-critical for reliable current-limit activation and thermal response.

Does the device block reverse current when the output voltage exceeds input?

Yes. Reverse current blocking is inherent to the high-side MOSFET topology. When OUTX rises above IN (e.g., due to external bias or coupled noise), leakage is limited to ≤0.2µA per channel-verified at OUTX = 5.5V and IN = 0V-preventing backfeed into the source rail.