Monolithic Power Systems Inc. MP62261DS-1-LF-P

Overview

MP62261DS-1-LF-P from Monolithic Power Systems is a single-channel, active-high current-limited power distribution switch with 2A continuous load capability, 3A typical current limit, and integrated output discharge function. It operates from 2.7V to 5.5V input, features a 45mΩ internal MOSFET, thermal shutdown at 140°C, and SOIC8 packaging - used in USB power distribution and PC card hot-swap circuits.

For engineers reviewing the MP62261DS-1-LF-P datasheet, MP62261DS-1-LF-P pinout, MP62261DS-1-LF-P application, or MP62261DS-1-LF-P equivalent, key selection criteria include enable polarity (active-high), output discharge resistance (100Ω), FLAG deglitch time (8ms), reverse current blocking, and SOIC8 thermal performance (θJA = 90°C/W).

Technical Context

The MP62261DS-1-LF-P implements a current-limit protection architecture that enters constant-current mode upon exceeding 3A trip threshold (typical), with response time under 1µs for peak currents up to 60A. Its thermal shutdown circuit disables the switch at 140°C junction temperature and recovers autonomously at ~120°C due to 20°C hysteresis.

It integrates an open-drain FLAG pin with 8ms deglitching for over-current detection, excludes deglitch during UVLO or thermal events, and provides active-high EN control with 2V logic-high threshold. The output discharge path activates only when disabled (EN low or VIN < UVLO threshold), discharging external capacitors via a 100Ω internal resistor.

Key Specifications

Pinout & Package

MP62261DS-1-LF-P uses an industry-standard SOIC8 package (5.0mm × 4.0mm, 1.27mm pitch) with exposed pad not connected internally; thermal performance relies on PCB copper area per JEDEC MS-012 AA.

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-1-LF-P uniquely combines active-high enable, 100Ω output discharge, and deglitched FLAG in SOIC8 - enabling compact, self-contained USB and hot-swap designs without auxiliary components or firmware workarounds.

Availability

MP62261DS-1-LF-P is available at Aetrix Electronics and suitable for smartphone peripheral power, USB 2.0 host port management, and notebook ExpressCard slot applications requiring stable component supply across industrial temperature ranges (-40°C to +85°C).

Supply support for MP62261DS-1-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 interface applications.

The MP6226x series targets compact, high-reliability power distribution in portable and embedded systems - designed specifically for USB, hot-swap, and peripheral power gating where fault visibility, inrush control, and autonomous recovery are essential.

FAQ

What is the logic polarity of the EN pin on MP62261DS-1-LF-P?

The EN pin is active-high: the device enables when EN voltage exceeds 2V (minimum) and disables when EN falls below 0.8V (maximum). This matches standard GPIO outputs from most microcontrollers and PMICs without requiring inverters.

Does MP62261DS-1-LF-P provide reverse current protection?

Yes - it blocks reverse current flow from OUT to IN when the input rail is absent or below UVLO threshold. Measured reverse leakage is ≤0.2µA at VOUT = 5.5V and VIN = GND, preventing backfeed into upstream supplies during hot-swap or brownout conditions.

How does the FLAG pin behave during thermal shutdown?

The FLAG pin is not deglitched during thermal shutdown events. It asserts immediately (low) upon thermal limit breach at 140°C, providing unfiltered fault indication for host monitoring - unlike over-current events, which require 8ms deglitch confirmation.

Can MP62261DS-1-LF-P drive a 100µF output capacitor safely?

Yes - turn-on time is 3ms (typ) with 100µF load and 5Ω resistance, and inrush current is limited to ≤3A. The integrated 100Ω discharge path clears this capacitance in under 10ms when disabled, satisfying USB and ExpressCard hot-plug safety standards.

What is the maximum ambient temperature for full 2A operation in SOIC8 package?

At TA = +60°C with standard 4-layer PCB layout (JEDEC JESD51-7), the device sustains 2A continuously without thermal shutdown. Derating is required above this: maximum ambient drops to ~45°C at 2A with minimal copper area, per θJA = 90°C/W and TJ(MAX) = 125°C.

Is UVLO present on MP62261DS-1-LF-P, and what are its thresholds?

Yes - under-voltage lockout activates below 1.95V (min) on power-up and releases hysteresis at ~2.2V. The 250mV hysteresis prevents oscillation near threshold and ensures clean enable/disable behavior during slow input ramps.

How does output discharge activate, and when is it disabled?

Output discharge engages automatically when EN is low OR VIN falls below UVLO threshold (≤1.95V). It remains active until VIN rises above UVLO and EN goes high. Discharge ceases immediately upon re-enable - no software or timing control required.