Monolithic Power Systems Inc. EVQ4415A-QB-00A

Overview

EVQ4415A-QB-00A from Monolithic Power Systems is a fully assembled and tested evaluation board for the MPQ4415AGQB synchronous step-down converter IC, delivering 3.3V/1.5A output from a 4–36V input range with 2.2MHz switching frequency, CISPR25 Class 5 EMI compliance, and AEC-Q100 Grade-1 qualification - deployed in automotive power rail validation and industrial DC-DC design verification.

For engineers reviewing the EVQ4415A-QB-00A datasheet, EVQ4415A-QB-00A pinout, EVQ4415A-QB-00A application, or EVQ4415A-QB-00A equivalent, this board enables rapid functional validation of the MPQ4415AGQB's high-efficiency synchronous buck operation, EN/SYNC control interface, Power Good signaling, and thermal shutdown behavior under real-world load and line transients.

Technical Context

The EVQ4415A-QB-00A implements the MPQ4415AGQB IC in forced continuous conduction mode (CCM) with internal 90mΩ high-side and 50mΩ low-side MOSFETs, supporting input-to-output voltage ratios up to 10.9:1 while maintaining stable 3.3V regulation across 0–1.5A loads and ambient temperatures from –40°C to +125°C.

It integrates a 0.807V internal reference, valley-current OCP with hiccup recovery, internal soft-start (2.2ms typical), and an open-drain Power Good (PG) signal that asserts low during short-circuit, overtemperature, or undervoltage lockout - all verified on the 2.5" × 2.5" PCB with optimized thermal vias and input EMI filtering using BLM41PG181SN1L magnetic beads.

Key Specifications

Availability

EVQ4415A-QB-00A is available at Aetrix Electronics and suitable for automotive power system validation, industrial DC-DC reference design development, and medical equipment power architecture prototyping requiring stable component supply and full regulatory-compliant test data.

Supply support for EVQ4415A-QB-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 analog and power ICs, with core expertise in DC-DC conversion, motor drivers, and LED lighting controllers.

The MPQ4415AGQB - evaluated by this board - belongs to MPS's automotive-grade synchronous buck regulator product line, designed specifically for compact, high-reliability power supplies in ADAS, infotainment, and body electronics where wide VIN, low EMI, and AEC-Q100 compliance are mandatory.

FAQ

What input voltage range does the EVQ4415A-QB-00A support?

The board accepts 4V to 36V DC input, matching the MPQ4415AGQB's operational range. It has been tested at 12V, 24V, and 36V with stable 3.3V/1.5A output and efficiency >85% across all conditions. Input EMI filtering includes a BLM41PG181SN1L bead and 22µF/10µF ceramic-aluminum bulk capacitance to suppress cable-borne noise.

How is output voltage adjusted on this evaluation board?

VOUT is set by an external resistor divider (R5 = 13kΩ, R6 = 41.2kΩ) connected to the FB pin, yielding 3.3V based on the 0.807V internal reference. The board supports adjustment down to 0.8V using the formula R_FB2 = R_FB1 × (V_OUT/0.807 − 1); recommended R_FB1 is ~40kΩ for V_OUT ≥ 1V.

Does the board support external clock synchronization?

Yes - the EN/SYNC pin accepts a 450kHz to 2.2MHz external square-wave clock to synchronize the internal oscillator's rising edge. This feature enables deterministic switching in multi-rail systems and reduces beat-frequency EMI. Driving EN <1V disables the regulator; >1.45V enables it.

What protection features are implemented and how are they verified?

The board demonstrates valley-current OCP with hiccup recovery, thermal shutdown (>150°C die temperature), and PG fault signaling (open-drain low during short, overtemp, or UVLO). These are confirmed via oscilloscope waveforms in the official test report (Rev. 1.0, p.6–7), including load-step response and thermal derating curves.

Is the EVQ4415A-QB-00A RoHS and AEC-Q100 compliant?

Yes - the MPQ4415AGQB IC is AEC-Q100 Grade-1 qualified (–40°C to +125°C), and all board components meet RoHS and halogen-free requirements. MPS confirms green status on its Quality Assurance portal; the board itself carries no separate qualification but serves as the reference platform for the qualified IC.

What is the physical size and mounting configuration?

The board measures 2.5" × 2.5" × 0.4" (6.4cm × 6.4cm × 1.0cm) with gold-plated 2.54mm pitch test pins on VIN, VOUT, GND, EN/SYNC, and PG. It uses a 4-layer PCB with dedicated power and ground planes, thermal vias under U1 (QFN-13), and silk-screened labeling for all critical nodes and component values.