Monolithic Power Systems Inc. MP5002DQ-LF-P

Overview

MP5002DQ-LF-P from Monolithic Power Systems is a programmable current-limit load switch IC designed for 3.3V input systems, integrating a 44mΩ DMOS power FET, adjustable 1A–3A current limit via external resistor, and dv/dt-controlled soft-start. It provides overvoltage clamping (4.0–5.0V), UVLO (2.15–2.5V), thermal latch shutdown (175°C), and bi-directional Enable/Fault signaling - deployed in hot-swap and portable power rails.

For engineers reviewing the MP5002DQ-LF-P datasheet, MP5002DQ-LF-P pinout, MP5002DQ-LF-P application, or MP5002DQ-LF-P equivalent, key selection criteria include verified 44mΩ R_DS(on), ILIMIT resistor-based trip/hold current tuning (e.g., 2.5A trip / 1.55A hold at 24Ω), QFN10 (3×3 mm) thermal pad layout requirements, and tri-state Enable/Fault logic levels (0.5V low, 0.8–2.0V fault, ≥2.5V enable).

Technical Context

The MP5002DQ-LF-P implements a sense-FET current-limit architecture with internal charge-pump gate drive enabling low on-resistance operation. Its dv/dt pin controls VOUT slew rate via internal 1.1ms ramp or external capacitor scaling (e.g., 23.5ms with 1nF), while UVLO and overvoltage clamp circuits independently regulate input validity and output voltage integrity.

Thermal protection uses a latched shutdown triggered at 175°C junction temperature, signaled by mid-level (0.8–2.0V) Enable/Fault pin voltage; fault flag reset requires either UVLO cycling or active low assertion on the same pin. The tri-state Enable/Fault interface supports wired-NOR fault bus sharing across multiple devices.

Key Specifications

Pinout & Package

MP5002DQ-LF-P uses a thermally enhanced QFN10 package (3mm × 3mm, 0.5mm pitch) with exposed VIN pad for PCB heat sinking. Pin 11 is the exposed thermal pad, electrically connected to VIN.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar programmable current-limit switch applications.

Compared with TPS2557DRCT and NIS5132MN, MP5002DQ-LF-P uniquely combines resistor-programmable current limit (1–3A), integrated 4.5V overvoltage clamp, and dv/dt-adjustable soft-start - making it optimal for space-constrained 3.3V systems requiring field-tunable protection behavior.

Availability

MP5002DQ-LF-P is available at Aetrix Electronics and suitable for hot-swap power rails, PC card slot protection, and laptop USB port power management requiring stable component supply, RoHS-compliant packaging, and QFN10 thermal performance.

Supply support for MP5002DQ-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 load management solutions.

The MP5002 product line delivers highly integrated, thermally robust current-limit switches for portable and embedded 3.3V systems - designed specifically to replace discrete FET + controller solutions in space- and reliability-critical applications.

FAQ

What is the maximum continuous output current supported by MP5002DQ-LF-P?

The MP5002DQ-LF-P does not specify a fixed maximum continuous current. Instead, its current limit is programmable from 1A to 3A using an external resistor between +ILIMIT and –ILIMIT pins. At 24Ω, it delivers 1.55A hold current continuously before triggering thermal shutdown - actual sustainable current depends on PCB copper area, ambient temperature, and thermal pad soldering quality.

How does the Enable/Fault pin behave during thermal shutdown?

During thermal shutdown, the Enable/Fault pin is actively driven to a mid-level voltage (0.8–2.0V) to signal fault condition. This state latches until the pin is pulled low externally or the input voltage drops below UVLO threshold (≤2.15V), resetting the internal fault flag and allowing re-enable upon recovery.

Can the dv/dt pin be left unconnected, and what is the default rise time?

Yes, the dv/dt pin may be left unconnected (floating). In this configuration, the internal circuit provides a fixed 1.1ms typical rise time (measured from 10% to 90% of VOUT) - sufficient for most 3.3V rail soft-start requirements without adding external components.

What is the purpose of the five parallel VOUT pins?

The five VOUT pins (pins 1–5) are internally bonded to the same power FET output node to reduce current density per pin, minimize bond-wire inductance, and improve thermal spreading across the QFN package. This layout supports high-pulse-current capability and lowers effective output impedance in high-speed load-switching applications.

Does MP5002DQ-LF-P require an external pull-up resistor on the Enable/Fault pin?

No. The Enable/Fault pin has an internal 25µA weak pull-up current that drives it to ~3.3V when floating - sufficient to enable the device without external components. An external pull-up is unnecessary unless interfacing with open-drain logic or driving longer traces where noise immunity is critical.

How is overvoltage protection implemented, and what is its clamping range?

Overvoltage protection activates when VIN exceeds the internal clamp threshold, limiting VOUT to 4.0–5.0V (typical 4.5V). This is achieved via an internal shunt regulator structure that sinks excess current - protecting downstream 3.3V logic from transients without requiring external TVS diodes or Zener clamps.

What PCB layout practices are critical for thermal performance?

Essential layout practices include: soldering the exposed VIN pad (pin 11) to a minimum 100mm² copper pour with ≥4 thermal vias; placing RLIMIT within 2mm of ILIMIT pins; locating C_dv/dt adjacent to pin 9; and routing high-current VOUT paths across all five pins with wide copper traces. Failure to implement these reduces θ_JA from 50°C/W to >80°C/W, risking premature thermal shutdown.