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

Overview

MP62261DS-1-LF-Z 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 - deployed in USB power distribution and PC Card hot-swap circuits.

For engineers reviewing the MP62261DS-1-LF-Z datasheet, MP62261DS-1-LF-Z pinout, MP62261DS-1-LF-Z application, or MP62261DS-1-LF-Z equivalent, key selection criteria include enable polarity (active high), FLAG deglitch timing (8ms), reverse current blocking, under-voltage lockout thresholds (2.3V typ), and SOIC8 thermal resistance (θJA = 90°C/W).

Technical Context

The device implements a current-limit protection architecture that transitions into constant-current mode upon exceeding 3A trip threshold, with response time under 1µs for peak currents up to 60A. Its thermal shutdown circuit monitors junction temperature and disables the switch at 140°C, recovering automatically at ~120°C due to 20°C hysteresis.

It integrates an open-drain FLAG pin with 8ms deglitch filtering for over-current reporting, while maintaining no glitch during power-up. The output discharge path uses a 100Ω internal resistor activated only when EN is deasserted or UVLO triggers, ensuring rapid VOUT decay without external components.

Key Specifications

Pinout & Package

MP62261DS-1-LF-Z is housed in a standard SOIC8 package (5.0mm × 4.0mm, 1.27mm pitch) with exposed pad not connected internally. Thermal performance is characterized per JESD51-7 on 4-layer PCB (θJA = 90°C/W, θJC = 42°C/W).

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-Z uniquely combines active-high control, integrated output discharge, open-drain FLAG with deglitching, and reverse current blocking - making it optimal for space-constrained hot-swap interfaces requiring autonomous fault handling.

Availability

MP62261DS-1-LF-Z is available at Aetrix Electronics and suitable for USB power distribution, notebook PC card slots, smartphone peripheral isolation, and telecom line card hot-swap applications requiring stable component supply across industrial temperature ranges.

Supply support for MP62261DS-1-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, with design centers in the US, China, and Taiwan, and global manufacturing partnerships.

This device belongs to MPS's Power Distribution Switch product line, engineered specifically for reliable, compact, and intelligent power rail control in portable and infrastructure equipment requiring autonomous fault response and minimal external components.

FAQ

What is the enable polarity of MP62261DS-1-LF-Z?

MP62261DS-1-LF-Z has active-high enable logic: the switch turns on when the EN pin voltage exceeds 2V (typical), and turns off when EN falls below 0.8V. This distinguishes it from the MP62260DS-1-LF-Z variant, which uses active-low enable. The top marking "62261DS1" confirms the active-high version.

Does MP62261DS-1-LF-Z support reverse current blocking?

Yes - the internal MOSFET structure prevents reverse current flow from OUT to IN when the device is disabled or powered down. This is confirmed in the datasheet's "Reverse Current Blocking" feature and electrical test condition "VOUT=5.5V, VIN=GND", where leakage is specified at 0.2µA.

How does the FLAG pin behave during thermal shutdown?

The FLAG pin asserts low immediately upon thermal shutdown activation (at 140°C) without deglitch filtering - unlike over-current events, which require 8ms confirmation. This allows immediate system-level thermal fault response, and the pin remains low until junction temperature drops to ~120°C and the device recovers.

What is the maximum allowable output capacitance for stable turn-on?

No hard upper limit is specified, but turn-on delay increases with output capacitance: 3ms for 100µF (CL=100µF, RL=5Ω). For CL > 470µF, inrush current limiting may require additional soft-start design. The datasheet recommends ≥10µF input capacitance and high-value electrolytic output caps for heavy loads to reduce ripple.

Can MP62261DS-1-LF-Z be used with 2.5V input?

No - the absolute minimum input voltage is 2.7V per Absolute Maximum Ratings and Electrical Characteristics tables. At 2.5V, under-voltage lockout engages (UVLO rising edge = 1.95–2.65V), preventing enable assertion and disabling internal regulation. Operation below 2.7V is outside guaranteed specifications.

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

Yes - the "-LF" suffix in MP62261DS-1-LF-Z explicitly denotes lead-free (Pb-free) and RoHS-compliant packaging per EU Directive 2011/65/EU. The device uses matte tin plating and meets JEDEC J-STD-020 moisture sensitivity level MSL3.

What is the thermal shutdown recovery temperature?

The device recovers from thermal shutdown at approximately 120°C, as stated in the DETAILED DESCRIPTION section. This 20°C hysteresis (140°C shutdown → 120°C recovery) prevents oscillatory cycling during sustained overload conditions.