Monolithic Power Systems Inc. EVQ5074-G-00A

Overview

EVQ5074-G-00A from Monolithic Power Systems is an AEC-Q100-qualified evaluation board for the MPQ5074 5.5V, 3A programmable current-limiting load switch. It implements a sense-FET topology with external ILIM resistor programming, delivers up to 3A continuous output across 3V–5.5V input, and supports soft-start, power-good signaling, and enable control - used to validate automotive infotainment, cluster, and ADAS power rail sequencing.

For engineers reviewing the EVQ5074-G-00A datasheet, EVQ5074-G-00A pinout, EVQ5074-G-00A application, or EVQ5074-G-00A equivalent, this board enables rapid characterization of current-limit accuracy, R_DS(ON) vs. temperature, PG delay timing, EN threshold behavior, and VIN/VCC leakage under automotive thermal and voltage stress conditions.

Technical Context

The EVQ5074-G-00A evaluates the MPQ5074's integrated current-sense architecture, where output current limit is set by an external resistor (R1 = 26.1kΩ) connected between ILIM and GND, yielding ~3A at 25°C. The board routes all critical signals - EN, PG, VCC, SS, ILIM, VIN, VOUT, and GND - to accessible test points and includes dual 22μF ceramic input/output capacitors (C1A/C1B/C2A/C2B) plus 100nF bypass caps (C3/C4).

It supports three operational modes: direct EN-controlled switching (EN >2.6V ON / <0.4V OFF), VCC-powered startup (3.6V required if VIN <3V), and dual-supply configuration (R2 removal). PG output asserts after soft-start completion and deasserts during overcurrent or UVLO events, with measured PG delay ranging 20–100μs across –40°C to +125°C.

Key Specifications

Availability

EVQ5074-G-00A is available at Aetrix Electronics and suitable for automotive infotainment system validation, ADAS ECU power architecture prototyping, and instrument cluster rail sequencing requiring stable component supply and AEC-Q100-compliant reference hardware.

Supply support for EVQ5074-G-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, cloud computing, and consumer applications.

The MPQ5074 product line delivers AEC-Q100-qualified load switches with programmable current limiting, low R_DS(ON), and integrated diagnostics - designed specifically for automotive subsystems requiring robust overcurrent protection and rail sequencing control.

FAQ

What is the purpose of the R1 resistor on the EVQ5074-G-00A board?

R1 (26.1kΩ) sets the output current limit of the MPQ5074 IC by connecting the ILIM pin to ground. Its value determines the trip threshold - 26.1kΩ yields ~3A at 25°C per the MPQ5074's 700V/A current-sense ratio. Changing R1 allows evaluation of different current-limit targets without modifying the IC.

Does the EVQ5074-G-00A require an external VCC supply?

Yes - when VIN drops below 3V, the board requires a separate 3.6V VCC supply to maintain MPQ5074 operation. At VIN ≥3V, VCC can be powered from VIN via internal LDO; the schematic shows optional VCC decoupling (C3/C4) and test point access for both configurations.

How is power-good (PG) functionality verified on this board?

PG status is accessible at test point "VPG" and asserts high after soft-start completes (typically within 100μs) when output voltage reaches >90% of VIN. It deasserts during overcurrent, UVLO, or thermal shutdown - verified using oscilloscope capture of CH2 (VPG) synchronized with CH4 (IOUT) and CH3 (VOUT) in the test reports.

Can the EVQ5074-G-00A evaluate thermal performance?

Yes - the board includes thermal test data across –40°C to +125°C for R_DS(ON), quiescent current, EN/PG thresholds, and current-limit accuracy. Layout uses exposed pad grounding and 2oz copper for thermal dissipation, enabling direct correlation between junction temperature and electrical performance under sustained 3A load.

What is the role of C4 on the EVQ5074-G-00A board?

C4 (100nF) sets the soft-start time (t_SS) by controlling the ramp rate of the internal gate driver. Its value determines how quickly VOUT rises at startup - preventing inrush current spikes. t_SS ≈ 1.2ms × C4(pF), so 100nF yields ~120μs soft-start, confirmed in oscilloscope waveforms on page 9 of the reference document.

Is the EVQ5074-G-00A compatible with other MPQ5074 variants?

Yes - it is designed for the MPQ5074GQBE-AEC1 (QFN-13, 2.5mm×3mm), but also supports evaluation of pin-compatible revisions like MPQ5074GQB-Z (non-AEC) since the board breaks out all signals and uses standard footprint. No hardware modification is needed for functional testing of alternate MPQ5074 variants.