Monolithic Power Systems Inc. MP62261DS-LF-P

Overview

MP62261DS-LF-P from Monolithic Power Systems is a single-channel, active-high enable, current-limited power distribution switch designed for USB VBUS and 3.3V/5V rail protection. It integrates a 50mΩ internal MOSFET, delivers 2A continuous load current with 3A typical current limit, features 8ms FLAG deglitching, reverse current blocking, and thermal shutdown - deployed in smartphone USB ports and notebook PC power rails.

For engineers reviewing the MP62261DS-LF-P datasheet, MP62261DS-LF-P pinout, MP62261DS-LF-P application, or MP62261DS-LF-P equivalent, key selection criteria include enable polarity (active high), SOIC8 package thermal performance, current-limit accuracy across 2.7–5.5V input, FLAG open-drain timing behavior, and reverse leakage under VOUT-backbias conditions.

Technical Context

The MP62261DS-LF-P implements a precision current-limit architecture using internal sense-amplifier feedback to enforce constant-current mode at ≥3A trip threshold during overload, with 2.3–4.3A variation over temperature and voltage. Its UVLO activates at 2.3V (rising edge) with 250mV hysteresis, ensuring clean startup above minimum system rail stability thresholds.

Thermal protection triggers at 140°C junction temperature with 20°C hysteresis, and the FLAG pin provides debounced fault reporting via open-drain output with 4–15ms deglitch window - independent of UVLO or thermal events. The device maintains <1.5μA shutdown current and supports reverse current blocking when VOUT > VIN.

Key Specifications

Pinout & Package

MP62261DS-LF-P is housed in an industry-standard SOIC8 package (JEDEC MS-012, variation AA), with 1.27mm pitch, 3.9mm × 4.9mm body size, and 1.75mm max height. Thermal resistance θ_JA = 90°C/W on 4-layer PCB enables 2A operation up to +85°C ambient without forced airflow.

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, MP62261DS-LF-P uniquely combines 50mΩ R_DS(on), 8ms FLAG deglitch, reverse blocking, and 3A current limit in a single SOIC8 footprint - delivering optimal balance of protection fidelity, thermal efficiency, and integration density for USB and portable 3.3V/5V rail switching.

Availability

MP62261DS-LF-P is available at Aetrix Electronics and suitable for smartphone USB power switching, notebook PC VBUS protection, and portable GPS power management requiring stable component supply, RoHS-compliant packaging, and long-term lifecycle support.

Supply support for MP62261DS-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 mixed-signal ICs for power management, motion control, and automotive applications.

The MP6226x series targets compact, thermally constrained portable and computing systems requiring robust, integrated power-switch protection - emphasizing low R_DS(on), precise current limiting, and intelligent fault reporting without external components.

FAQ

What is the maximum allowable input voltage for MP62261DS-LF-P?

The absolute maximum input voltage (IN) is +6.0V per the datasheet's Absolute Maximum Ratings table. Operation above 5.5V nominal violates recommended conditions and risks permanent damage to the internal MOSFET and control circuitry, even briefly. Designers must ensure input transients remain within this limit using clamping or filtering.

Does MP62261DS-LF-P support reverse current flow from OUT to IN?

Yes - MP62261DS-LF-P includes integrated reverse current blocking, limiting reverse leakage to ≤1μA when VOUT = 5.5V and VIN = GND. This prevents backfeeding into upstream supplies during hot-swap or failure scenarios, eliminating need for external Schottky diodes in most 3.3V/5V distribution paths.

How does the FLAG pin behave during thermal shutdown versus over-current events?

FLAG asserts LOW after 8ms deglitch timeout for both over-current and thermal shutdown events. However, FLAG is *not* deglitched during UVLO activation or thermal events - meaning it responds immediately to thermal fault onset without delay, unlike OCP which enforces the 8ms filter to reject transients.

What is the typical turn-on time from EN assertion to 90% VOUT?

Measured from 50% EN rise to 90% VOUT, typical turn-on time is 1.6ms (max 3ms) with CL = 100μF and RL = 5Ω. This value scales inversely with load capacitance and resistance - lighter loads yield faster ramp times, critical for USB enumeration timing compliance.

Can MP62261DS-LF-P be used with 2.7V input in battery-powered applications?

Yes - MP62261DS-LF-P operates down to 2.7V input and maintains full 2A continuous current capability at that voltage. Its UVLO threshold (2.3V rising edge) ensures reliable enablement even as Li-ion cells discharge to ~3.0V, supporting extended runtime in portable designs.

Is the SOIC8 package lead-free and RoHS-compliant?

Yes - the "-LF" suffix in MP62261DS-LF-P explicitly denotes lead-free, RoHS-compliant packaging per JEDEC J-STD-020 moisture sensitivity level 3 requirements. The device is qualified for reflow soldering with peak temperature up to 260°C.

What is the thermal resistance (θ_JA) of MP62261DS-LF-P in standard layout?

θ_JA is 90°C/W when mounted on a 4-layer PCB per JESD51-7 test standard. This value assumes 1 in² copper pour on top and bottom layers connected via ≥6 thermal vias under the exposed pad area - essential for sustaining 2A continuous current at +85°C ambient.