Monolithic Power Systems Inc. MP62351ES-LF-P

Overview

MP62351ES-LF-P from Monolithic Power Systems is a dual-channel, active-high, current-limited power distribution switch with 500mA continuous per channel, 85mΩ R_DS(on), and integrated output discharge (100Ω). It operates from 2.7V to 5.5V input and delivers overcurrent protection via constant-current limiting and thermal shutdown at 140°C - used in USB power rails and hot-swap interfaces for portable computing.

For engineers reviewing the MP62351ES-LF-P datasheet, MP62351ES-LF-P pinout, MP62351ES-LF-P application, or MP62351ES-LF-P equivalent, key selection criteria include guaranteed 550–1100mA current limit accuracy, 8ms FLAG deglitch timing, reverse current blocking, under-voltage lockout (1.95–2.65V), and SOIC-8 package compatibility with industrial temperature range (–20°C to +85°C).

Technical Context

The MP62351ES-LF-P integrates two independent N-channel MOSFET power switches with matched current-limit circuitry, enabling simultaneous or independent channel control. Each channel features dedicated open-drain FLAG outputs with 8ms deglitch filtering and responds to overcurrent events by entering constant-current mode before thermal shutdown at 140°C.

Its internal UVLO (1.95V rising edge) prevents erratic operation during brown-out conditions, while the 100Ω discharge path actively bleeds external output capacitors upon disable - critical for safe hot-swap sequencing. Reverse current blocking ensures no backflow from OUT to IN when disabled.

Key Specifications

Pinout & Package

MP62351ES-LF-P is housed in an 8-pin SOIC package (body size 4.9mm × 3.9mm, 1.27mm pitch), rated for –20°C to +85°C operating temperature and RoHS-compliant (LF suffix).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MP62351ES-LF-P, MP5095DJ-LF-Z offers higher current and lower R_DS(on) in a smaller package but sacrifices dual-channel autonomy and discharge; TPS22965DNYR provides faster response and better efficiency but adds design complexity for discharge and thermal management.

Availability

MP62351ES-LF-P is available at Aetrix Electronics and suitable for USB power distribution, PC Card hot swap, and notebook PC power rail applications requiring stable component supply and long-term industrial availability.

Supply support for MP62351ES-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, with design centers across Asia and North America.

The MP6235x series belongs to MPS's load switch product line, engineered specifically for reliable, low-footprint power sequencing in portable and embedded systems with stringent safety and thermal constraints.

FAQ

Is MP62351ES-LF-P pin-compatible with MP62350ES-LF-P?

No - MP62351ES-LF-P uses active-high enable logic (EN1/EN2 high = ON), while MP62350ES-LF-P uses active-low enable. Pinout is identical, but control signaling is inverted; direct substitution requires firmware or schematic revision to invert enable signals.

What is the maximum allowable continuous power dissipation in SOIC-8 at 60°C ambient?

Using θ_JA = 90°C/W and T_J(MAX) = 150°C, maximum continuous power dissipation is (150 – 60)/90 = 1.0W. At 500mA and 85mΩ, power loss is 21.25mW per channel - well within thermal limits even at full load.

Does the FLAG pin require an external pull-up resistor?

Yes - FLAG1 and FLAG2 are open-drain outputs and must be pulled up to a valid logic voltage (e.g., 3.3V or 5V) with a 10kΩ resistor to generate a defined high state when no fault is present.

Can MP62351ES-LF-P drive a 1000µF output capacitor safely?

Yes - turn-on time increases linearly with capacitance (Ton ≈ 3ms for 100µF), so 1000µF yields ~30ms rise time. This remains within safe inrush limits; however, ensure input supply can sustain peak current during ramp-up without droop.

Why is MP62351ES-LF-P marked "Not Recommended for New Designs"?

MPS has superseded this part with MP5095, which offers higher current, lower R_DS(on), smaller QFN packaging, and improved thermal performance - though MP62351ES-LF-P remains fully qualified and supported for legacy production and repair.

How does the 100Ω discharge path affect output voltage decay time?

With a 100µF output capacitor, the RC time constant is 10ms; voltage decays to ~37% of initial value in 10ms and to <1% in ~50ms - satisfying USB Battery Charging v1.2 and IEC 62368-1 safe discharge requirements.

Does under-voltage lockout (UVLO) reset automatically when input rises above threshold?

Yes - UVLO has 250mV hysteresis; once VIN rises above 2.65V (rising edge), the device resumes normal operation without requiring an enable toggle, provided EN is asserted.