Monolithic Power Systems Inc. MP5001DQ-LF-Z

Overview

MP5001DQ-LF-Z from Monolithic Power Systems is a programmable current-limit switch IC designed for hot-swap and load protection in 4V–10V input systems. It integrates a 44mΩ DMOS power FET, adjustable current limit (1.5A–2.8A typical with 22Ω R_LIMIT), slew-rate control via dv/dt pin, and dual overvoltage/undervoltage protection. It operates in laptops, PC cards, and portable electronics where inrush current limiting and short-circuit hold-current clamping are required.

For engineers reviewing the MP5001DQ-LF-Z datasheet, MP5001DQ-LF-Z pinout, MP5001DQ-LF-Z application, or MP5001DQ-LF-Z equivalent, key selection criteria include its 44mΩ R_DS(on), thermal latch shutdown at 175°C, tri-state Enable/Fault interface for system-level fault coordination, and QFN10 (3×3mm) package with exposed pad for thermal management.

Technical Context

The MP5001DQ-LF-Z implements a sense-FET-based current-limit architecture with external resistor programming of trip (3.3A) and hold (2.1A) thresholds. Its internal charge pump enables full gate drive for low R_DS(on) across input voltage range.

UVLO (3.2–4.0V turn-on, 0.1V hysteresis) and output clamping (5.95–7.35V) provide robust input rail supervision. The dv/dt pin supports fixed 1.1ms ramp time (floating) or programmable rise time up to 23.5ms with external capacitor.

Key Specifications

Pinout & Package

MP5001DQ-LF-Z uses a QFN10 (3mm × 3mm) package with exposed thermal pad (Pin 11/VCC). Pin 6 is No Connect and must remain floating. The 10-pin layout supports high-current source routing and thermal dissipation via bottom-side copper.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS259211RGER and AP22653WM6-7, MP5001DQ-LF-Z uniquely combines resistor-programmable current thresholds, dv/dt-controlled rise time, and thermal latch functionality in a single QFN10 package - enabling robust hot-swap implementation without external timing or fault-handling circuitry.

Availability

MP5001DQ-LF-Z is available at Aetrix Electronics and suitable for hot-swap modules, PC card power management, smartphone baseband power, and USB-C port protection requiring stable component supply across automotive-grade temperature ranges (–40°C to +85°C).

Supply support for MP5001DQ-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 expertise in DC/DC conversion, LED drivers, and load protection solutions.

The MP5001 product line delivers integrated current-limit switches optimized for hot-swap, inrush control, and system-level fault containment in space-constrained portable and industrial equipment.

FAQ

What is the maximum continuous current the MP5001DQ-LF-Z can deliver without thermal shutdown?

At T_A = 25°C with standard PCB layout (0.5 in² copper), MP5001DQ-LF-Z sustains 4.2A continuously. At T_A = 80°C, derated continuous current drops to 2.3A due to thermal resistance (θ_JA = 50°C/W). Sustained hold-current operation (e.g., 2.1A during short) requires thermal vias and adequate copper area to avoid latch-off.

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

During thermal shutdown, the Enable/Fault pin drives to an intermediate voltage level (0.82–2.0V) to signal fault condition. This mid-level state sets the internal fault flag and disables the output. The pin remains latched at mid-level until externally pulled low or until V_CC cycles below UVLO threshold to reset the flag.

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

Yes - the dv/dt pin is internally biased and floats by default, yielding a guaranteed 0.64–2.0ms rise time (1.1ms typical) from 10% to 90% of output voltage. No external capacitor is required for basic inrush control; adding capacitance linearly increases ramp time per K_RT = 22E6.

What is the role of the N/C pin (Pin 6), and what happens if it is grounded?

Pin 6 is designated No Connect and contains no internal circuitry. It must remain unconnected and floating. Grounding or connecting this pin may cause unpredictable behavior, including failure to enable, incorrect current limiting, or thermal instability - per MPS package documentation and layout guidelines.

How is current limit set, and what resistor value yields 2.1A hold current?

Hold current is set by resistor R_LIMIT between I-Limit (Pin 7) and SOURCE (Pins 1–5). With V_CC = 5V, a 22Ω resistor produces 2.1A hold current and 3.3A trip current, as confirmed in Table 1 of the datasheet. Resistance tolerance directly impacts accuracy: ±1% resistor yields ±1% current limit variation.

Does MP5001DQ-LF-Z support reverse current blocking?

No - MP5001DQ-LF-Z is a unidirectional high-side switch with source-connected output. It does not block reverse current flow from load to input. For reverse polarity or backfeed protection, an external Schottky diode or dedicated reverse-blocking IC is required.

What is the minimum input voltage required to maintain regulation and current limiting?

The device requires V_CC ≥ 3.2V to exit UVLO and enable output. Below 3.2V, the output is disabled and Enable/Fault pin is driven low. Current limiting remains active only when V_CC is within 4V–10V operating range; outside this range, protection functions are not guaranteed.