Monolithic Power Systems Inc. EVQ5872-RP-00A

Overview

EVQ5872-RP-00A from Monolithic Power Systems is an AEC-Q100 Grade 1 qualified evaluation board for the MPQ5872 smart high-side load switch, designed to demonstrate 42V load dump protection, 60mΩ R_DS(on), and real-time current sensing via FT/CS pin. It supports 3.5V–28V input, 2A continuous output, and configurable soft-start and current limiting for automotive power distribution applications.

For engineers reviewing the EVQ5872-RP-00A datasheet, EVQ5872-RP-00A pinout, EVQ5872-RP-00A application, or EVQ5872-RP-00A equivalent, this board enables rapid validation of MPQ5872 diagnostics (open-load, short-circuit, battery reverse), slew-rate controlled startup, and fault reporting under load dump and cold-crank conditions.

Technical Context

The EVQ5872-RP-00A implements the MPQ5872's full diagnostic architecture-including on-state and off-state fault detection-via dedicated pins: FT/CS delivers 1/K_CS-scaled current sensing (K_CS = 1000), while DIAG_EN enables/disables open-load and battery-short detection. EN controls switching with 1.2V turn-on threshold.

It validates critical automotive transient resilience: 42V load dump immunity, 24V short-circuit protection voltage limit, and cold-crank operation down to 3.5V VIN. The board integrates all support components-RCL for external current limit, CSS for soft-start, and CN1/CN2 jumpers for mode configuration-per MPQ5872's QFN-8 (2mm × 2.5mm) layout.

Key Specifications

Availability

EVQ5872-RP-00A is available at Aetrix Electronics and suitable for automotive ECU development, ADAS power domain validation, and infotainment system load management requiring stable component supply and AEC-Q100-compliant reference hardware.

Supply support for EVQ5872-RP-00A 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 power management ICs for automotive, industrial, and computing applications, with design centers in the US, China, and Taiwan.

The MPQ5872 product line delivers AEC-Q100-qualified smart high-side switches optimized for 12V/24V automotive subsystems-enabling safe, diagnosable, and transient-resilient power distribution in ECUs, body control modules, and lighting drivers.

FAQ

What is the purpose of the CN1 jumper on the EVQ5872-RP-00A?

CN1 enables off-state open-load detection by connecting the MPQ5872's DIAG_EN pin to internal biasing. When shorted, it activates battery-short-to-ground and open-load diagnostics during device shutdown; removing the short disables these functions to reduce standby current.

How is the current limit configured on this evaluation board?

The current limit is set either internally (by shorting ILIM to GND via CN2) or externally using resistor RCL. For external configuration, RCL is calculated as RCL = (0.7V × 1000)/I_CL, where I_CL is the desired current limit in amperes-supporting precise inrush control during startup.

Can the EVQ5872-RP-00A be used to validate cold-crank performance?

Yes. The board supports input voltages down to 3.5V and has been tested under cold-crank conditions (VIN = 3.5V–12V, IOUT = 0A–2A). Waveforms in the test report confirm stable VOUT regulation and accurate FT/CS reporting during low-VIN transients.

What does the FT/CS pin output represent, and how is it used?

The FT/CS pin outputs a voltage equal to I_LOAD/1000 (e.g., 2A load → 2mV), enabling direct current measurement with a precision ADC. During faults, it pulls up to indicate over-current or short-circuit events-eliminating need for separate sense amplifiers or fault comparators.

Is reverse-polarity protection implemented on this board?

Yes. CN3 connects in parallel with D1 (BAV21W) and R5 to form a reverse-polarity clamp network. When shorted, it allows the diode to shunt reverse voltage, protecting the MPQ5872 from damage during incorrect battery connection-verified per ISO 16750-2.