Monolithic Power Systems Inc. EVQ2177-QH-00A

Overview

EVQ2177-QH-00A from Monolithic Power Systems is a fully assembled and tested evaluation board for the MPQ2177GQHE-AEC1 monolithic synchronous step-down converter, delivering up to 1A output current from a 2.5V–6V input, operating at 2.4MHz switching frequency, with AEC-Q100 Grade 1 qualification, and supporting adjustable 0.6V–6V output voltage via external resistor divider - used for automotive infotainment power rail validation.

For engineers reviewing the EVQ2177-QH-00A datasheet, EVQ2177-QH-00A board layout, EVQ2177-QH-00A test setup, or EVQ2177-QH-00A compatible IC alternatives, this page provides verified performance curves (efficiency, thermal rise, CISPR25 Class 5 EMI), startup/shutdown waveforms, protection behavior (SCP, OVP, thermal auto-recovery), and bill-of-materials traceability for rapid automotive DC/DC design verification.

Technical Context

The EVQ2177-QH-00A implements constant-on-time (COT) control with VIN feed-forward to maintain stable 2.4MHz switching across input and load variations, enabling fast transient response without loop compensation. It supports forced continuous conduction mode (FCCM) for reduced output ripple and low-dropout operation with 100% duty cycle capability.

Board-level features include an open-drain power good (PG) signal that asserts high when FB reaches 90% of 0.6V reference and deasserts at 85%, plus cycle-by-cycle current limiting, short-circuit protection with auto-recovery, and thermal shutdown with hysteresis - all validated per AEC-Q100 stress conditions.

Key Specifications

Availability

EVQ2177-QH-00A is available at Aetrix Electronics and suitable for automotive infotainment system validation, ADAS domain controller power architecture prototyping, and body electronics ECU development requiring stable component supply and AEC-Q100-aligned reference designs.

Supply support for EVQ2177-QH-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, with over two decades of expertise in DC/DC conversion, motor drivers, and LED lighting solutions for automotive, industrial, and consumer markets.

The MPQ2177 product line delivers AEC-Q100 Grade 1 qualified synchronous buck converters optimized for space-constrained automotive subsystems requiring high efficiency, low EMI, and robust fault protection - targeting infotainment SoCs, radar sensors, and telematics modules.

FAQ

What input voltage range does the EVQ2177-QH-00A support during evaluation?

The board supports 2.5V to 6V input voltage, matching the MPQ2177GQHE-AEC1's operational range. This covers automotive battery conditions including cold-crank (down to 2.5V) and post-ignition transients (up to 6V), and has been validated with damping capacitors for long cable setups (>0.5m).

How is output voltage adjusted on the EVQ2177-QH-00A?

VOUT is set using an external resistor divider (R5/R6) connected to the FB pin. With R5 = 100kΩ, R6 = 100kΩ yields 1.2V output; other values are listed in the schematic (e.g., 36kΩ/18kΩ for 1.8V). The feedback reference is fixed at 0.6V, and Equation (1) in the quick start guide defines the exact ratio.

Does the board demonstrate full protection functionality?

Yes - test waveforms confirm short-circuit protection (SCP) entry/recovery, thermal shutdown with auto-restart, over-voltage protection (OVP), and PG signal timing during startup/shutdown. SCP recovery time is measured at ~400µs, and thermal rise remains within AEC-Q100 limits at 1A continuous load.

Is CISPR25 Class 5 EMI compliance verified on this board?

Yes - conducted (150kHz–108MHz) and radiated (150kHz–1GHz, horizontal/vertical polarization) emissions were measured per CISPR25 Class 5 limits. The board includes a dedicated EMI filter stage (L2 + CIN3–CIN5) and optimized PCB stack-up (2oz copper), with peak/average results published in the test report.

Can the EN pin be used to control the MPQ2177 during evaluation?

Yes - applying >0.9V to EN turns the regulator on; <0.65V disables it. The board exposes EN via a 1mm golden pin, and unused EN can be tied directly to VIN. Startup/shutdown waveforms (EN-triggered) are included in the test report, showing controlled soft-start and PG assertion timing.

What is the default output configuration and efficiency at full load?

The board is configured for 1.2V @ 1A output using a 2.2µH inductor (XFL4020-222MEB) and 22µF/4.7µF output capacitance. At VIN = 3.3V, VOUT = 1.2V, IOUT = 1A, typical efficiency is 88.75%; peak efficiency reaches 91.87% at 0.3A load with VIN = 2.5V.