Monolithic Power Systems Inc. MP62040DQFU-1-LF-P

Overview

MP62040DQFU-1-LF-P from Monolithic Power Systems is an active-low, single-channel high-side load switch IC with 2A continuous current capability, 85mΩ on-resistance at 4.5V input, and 115μs soft-start slew rate control. It operates from 1.7V to 5.5V supply, integrates level-shifting logic for independent enable voltage domain, and targets portable power rail switching in space-constrained designs.

For engineers reviewing the MP62040DQFU-1-LF-P datasheet, MP62040DQFU-1-LF-P pinout, MP62040DQFU-1-LF-P application, or MP62040DQFU-1-LF-P equivalent, this device delivers verified high-side switching with controlled inrush, ultra-low shutdown current (1μA), and UTQFN4 package compatibility for battery-powered USB peripherals, PMIC auxiliary rails, and dual-battery switchover circuits.

Technical Context

The MP62040DQFU-1-LF-P implements a P-channel MOSFET high-side switch with integrated gate driver and level-shifted enable input, enabling direct interface with 1.2V–5.5V logic while powered from a separate 1.7V–5.5V rail. Its internal soft-start circuit limits dV/dt to 115μs rise time (10%–90%), reducing peak inrush current during hot-plug events.

Thermal design is supported by a 0.55mm-profile UTQFN4 package with exposed thermal pad tied to GND, achieving θJA = 173°C/W on a 4-layer PCB. The device features overtemperature shutdown and supports continuous operation up to +85°C ambient with derated 1.4A current at that temperature.

Key Specifications

Pinout & Package

MP62040DQFU-1-LF-P uses a 4-pin UTQFN4 package with exposed thermal pad (pin 2). All pins are surface-mount; pin 1 (OUT) and pin 3 (IN) carry main power path current, pin 4 (EN) accepts logic-level enable signal, and pin 2 (GND) serves as both ground reference and primary thermal path.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-side load switch applications.

Compared with TPS22915YZPR and NIS5132MN3TXG, MP62040DQFU-1-LF-P uniquely combines active-low logic, wide 1.7V–5.5V operation, and built-in level shifting-enabling direct use with sub-1.8V logic in ultra-low-power microcontrollers without external translators.

Availability

MP62040DQFU-1-LF-P is available at Aetrix Electronics and suitable for USB peripheral power switching, battery switchover circuits, and PMIC auxiliary rail control requiring stable component supply across industrial, medical, and consumer electronics programs.

Supply support for MP62040DQFU-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 power ICs, with core expertise in DC/DC conversion, LED drivers, and power distribution solutions.

The MP62040/MP62041 product line was designed specifically for compact, low-quiescent-current high-side switching in battery-powered and space-constrained portable electronics, emphasizing integration, thermal efficiency, and logic flexibility.

FAQ

What is the maximum continuous current rating for MP62040DQFU-1-LF-P at +85°C ambient?

The device supports 1.4A continuous current at TA = +85°C, as specified in the Absolute Maximum Ratings table. This derating accounts for thermal resistance (θJA = 173°C/W) and junction temperature limit of +125°C. Board layout with adequate copper area on the thermal pad improves actual performance.

Does MP62040DQFU-1-LF-P require an external pull-up resistor on the EN pin?

No. The EN pin has internal logic-level detection and does not require external biasing. It sinks only 2–4μA when active and accepts logic-low signals down to 0.4V, making it compatible with open-drain or push-pull MCU outputs without additional components.

Can MP62040DQFU-1-LF-P be used with input voltages below 1.7V?

No. Operation below 1.7V is outside specification and may result in incomplete turn-on, increased R_DS(on), or failure to meet timing parameters. The device is characterized and guaranteed only from 1.7V to 5.5V, with optimal performance above 2.5V.

Is the exposed thermal pad on the UTQFN4 package electrically connected internally?

Yes. Pin 2 is both the GND terminal and the exposed thermal pad. It must be soldered to a PCB ground plane to ensure proper electrical reference, thermal dissipation, and EMI performance. Floating or unconnected thermal pads violate recommended layout guidelines.

How does the soft-start function affect output voltage rise time under heavy capacitive loads?

The 115μs typical rise time (10%–90%) is measured with 100mA load and remains consistent up to 2A due to internal slew-rate control. With >100μF output capacitance, rise time increases linearly-e.g., ~230μs with 220μF-but inrush current stays bounded to safe levels per design.

What is the recommended input capacitance for stable operation?

A minimum 10μF ceramic or tantalum capacitor between IN and GND is required per the datasheet. This suppresses input transients caused by switching events elsewhere on the rail and prevents oscillation during turn-on. Additional bulk capacitance improves hold-up during transient load steps.

Does MP62040DQFU-1-LF-P support reverse current blocking?

Yes. As a P-channel high-side switch, it inherently blocks reverse current flow from OUT to IN when disabled. However, continuous reverse conduction through the body diode is not recommended per Absolute Maximum Ratings; external reverse-blocking diodes are advised for bidirectional fault protection.