Monolithic Power Systems Inc. MP62040DQFU-LF-Z

Overview

MP62040DQFU-LF-Z from Monolithic Power Systems is a high-side load switch IC with active-low enable, 1.7V–5.5V input range, 85mΩ R_DS(on) at 4.5V, 2A continuous current rating, and 115μs soft-start rise time. It integrates a P-channel MOSFET and level-shift logic for independent EN voltage domain control, used in portable power rail switching and battery switchover circuits.

For engineers reviewing the MP62040DQFU-LF-Z datasheet, MP62040DQFU-LF-Z pinout, MP62040DQFU-LF-Z application, or MP62040DQFU-LF-Z equivalent, key selection criteria include active-low enable polarity, UTQFN4 thermal pad layout, 1μA shutdown current, slew-controlled turn-on, and 0.55mm ultra-low profile for space-constrained PCBs.

Technical Context

This device implements a single-channel high-side power distribution switch using an integrated P-channel MOSFET with internal gate driver and slew-rate control circuitry. The level-shifting enable input allows logic-level compatibility across supply domains (e.g., 1.8V EN driving 5V IN rail), while the 115μs V_OUT rise time limits inrush current during hot-plug events.

Thermal management relies on the exposed thermal pad (Pin 2) soldered to GND plane, with θ_JA = 173°C/W on 4-layer PCB. Continuous operation supports 2A at T_A ≤ +25°C and derates to 1.4A at +85°C ambient, constrained by junction temperature limit of +125°C.

Key Specifications

Pinout & Package

MP62040DQFU-LF-Z uses a 4-pin UTQFN package with exposed thermal pad (Pin 2). All pins are surface-mount; Pin 2 must be soldered to a solid GND copper pour 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 MP62040DQFU-LF-Z, TPS22915BYFPR offers lower on-resistance but eliminates level-shifting capability, while NCP380LSN3T2G lacks integrated slew control-both require redesign of enable interface or inrush mitigation strategy.

Availability

MP62040DQFU-LF-Z is available at Aetrix Electronics and suitable for portable electronics, battery-powered medical devices, and USB-C power delivery systems requiring stable component supply, RoHS compliance, and long-term lifecycle support.

Supply support for MP62040DQFU-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, headquartered in California and serving global markets since 1997.

The MP62040 belongs to MPS's Power Distribution Switch product line, engineered for compact, low-I_Q, high-reliability load switching in space- and power-constrained portable and industrial systems.

FAQ

What is the maximum continuous current rating for MP62040DQFU-LF-Z?

The MP62040DQFU-LF-Z supports 2A continuous current at T_A = +25°C ambient, derating linearly to 1.4A at +85°C. This rating assumes proper PCB thermal design with the exposed GND pad fully soldered to a ≥100mm² copper area, per JEDEC MO-229 guidelines.

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

No external pull-up is required. The EN pin has internal weak pull-down (typ. 10MΩ), ensuring default OFF state when left floating. For robust noise immunity in noisy environments, a 100kΩ external pull-down is recommended-but not mandatory-for fail-safe operation.

Can MP62040DQFU-LF-Z operate with a 1.2V enable signal?

No. The EN pin logic low threshold is 0.4V max, and logic high threshold is 1.2V min. A 1.2V signal sits at the minimum valid high level and may not reliably enable the device across voltage and temperature extremes. Use ≥1.4V for guaranteed activation.

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

Yes. Pin 2 is both the electrical ground terminal and the thermal pad. It must be soldered to a PCB GND plane with ≥90% solder coverage. No isolation or series resistance is permitted-this connection provides both current return path and primary heat dissipation route.

What is the recommended input capacitance for stable operation?

MPS specifies ≥10μF ceramic or tantalum capacitor between IN and GND, placed within 3mm of the IN pin. This minimizes input voltage ripple during load transients and suppresses ringing caused by PCB trace inductance, especially critical during 2A switching events.

How does the slew-rate control affect output voltage rise time?

The internal slew-rate control fixes V_OUT rise time to 115μs (typ.) from 10% to 90% of VIN. This limits di/dt during turn-on, capping inrush current to ~17A for a 100μF load, thereby preventing supply collapse and avoiding false triggers in downstream UVLO circuits.

Is MP62040DQFU-LF-Z compatible with lead-free reflow profiles?

Yes. The UTQFN4 package is rated for standard IPC/JEDEC J-STD-020D lead-free reflow, with peak temperature up to 260°C. The "-LF" suffix confirms RoHS-compliant finish and qualification to MSL3 moisture sensitivity level, requiring bake before assembly if exposed >168 hours at ambient.