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

Overview

MP62040DQFU-1-LF-Z from Monolithic Power Systems is a single-channel, active-low high-side load switch 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 EN voltage domain, and targets portable power rail switching in space-constrained designs.

For engineers reviewing the MP62040DQFU-1-LF-Z datasheet, MP62040DQFU-1-LF-Z pinout, MP62040DQFU-1-LF-Z application, or MP62040DQFU-1-LF-Z equivalent, key selection criteria include active-low enable behavior, UTQFN4 thermal pad grounding requirement, 1μA shutdown current, and 0.55mm profile suitability for ultra-thin battery-powered devices.

Technical Context

The MP62040DQFU-1-LF-Z implements a P-channel MOSFET high-side switch with integrated gate driver and slew-rate-controlled turn-on. Its level-shift circuit enables EN logic compatibility across 1.7V–4.5V, decoupled from VIN, supporting mixed-voltage system control.

Thermal design relies on the exposed thermal pad (Pin 2) connected to GND, delivering θJA = 173°C/W on a 4-layer PCB. The device enters thermal shutdown above +125°C junction temperature and supports pulsed loads up to ±6A (duty cycle <2%, pulse width <300μs).

Key Specifications

Pinout & Package

MP62040DQFU-1-LF-Z uses a 4-pin UTQFN package (1.6mm × 1.2mm, 0.55mm height) with an exposed thermal pad (Pin 2) requiring solder connection to GND plane for thermal and electrical integrity.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS22915YZFT and NCP45520MUTBG, MP62040DQFU-1-LF-Z offers optimal balance of ultra-low height, active-low native interface, and integrated thermal pad-making it preferred for mechanically constrained, battery-sensitive portable systems where ease of thermal design and GPIO compatibility are prioritized over marginal R_DS(on) reduction.

Availability

MP62040DQFU-1-LF-Z is available at Aetrix Electronics and suitable for portable load switching, battery switchover circuits, level-translated power control, and USB-C power path management requiring stable component supply and RoHS-compliant packaging.

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

The MP62040/MP62041 product line delivers ultra-compact, thermally robust high-side switches optimized for battery-powered portable electronics where board area, height, and standby power are critical constraints.

FAQ

What is the maximum allowable continuous current at +85°C ambient?

The MP62040DQFU-1-LF-Z supports ±1.4A continuous drain current at TA = +85°C, as specified in Absolute Maximum Ratings. This derating accounts for thermal resistance (θJA = 173°C/W) and ensures junction temperature remains below +125°C with proper PCB thermal design and GND pad soldering.

Can the EN pin be driven directly from a 1.8V microcontroller GPIO?

Yes. The EN pin accepts logic-low signals down to 0.4V max and logic-high up to 1.2V min, making it fully compatible with 1.8V CMOS outputs without external level shifting. Its internal level-shift circuit isolates EN logic domain from VIN, enabling safe operation even when VIN = 5.5V.

Is the thermal pad (Pin 2) electrically connected to GND internally?

Yes. Pin 2 is both the signal ground and the exposed thermal pad, which must be soldered to a PCB GND plane. Electrical connection to GND is mandatory for functional operation and thermal performance-floating or unconnected thermal pads cause excessive junction temperature and premature thermal shutdown.

What is the recommended input capacitance for stable operation?

A minimum 10μF ceramic capacitor between IN and GND is required per the Application Information section. This mitigates input supply transients and ringing caused by trace inductance, especially during fast load switching events. Larger values (e.g., 22μF) improve immunity in noisy environments.

Does the device support reverse current blocking when disabled?

No. The MP62040DQFU-1-LF-Z does not provide reverse current blocking. When disabled, the internal P-MOSFET body diode remains forward-biased if VOUT > VIN, allowing reverse conduction. For bidirectional blocking, an external series Schottky diode or complementary switch configuration is required.

How does the 115μs soft-start time affect output capacitance selection?

The 115μs VOUT rise time (10% to 90%) limits inrush current into output capacitance. For a 1000μF load, peak inrush stays below 3A. Larger capacitors (e.g., 2200μF) extend rise time beyond specification and may trigger overcurrent protection; output capacitance should be sized accordingly or supplemented with pre-charge circuitry.

What is the function of the top marking "AGY" on the UTQFN package?

"AGY" is the manufacturer's top-side marking for MP62040DQFU variants, confirming part identity and revision. It appears adjacent to Pin 1 index and is used for visual verification during assembly and inspection. The marking is laser-etched and conforms to JEDEC MO-229 standards for UTQFN packages.