Monolithic Power Systems Inc. EVM3630-QV-00A

Overview

EVM3630-QV-00A from Monolithic Power Systems is an evaluation board for the MPM3630GQV synchronous step-down module converter, delivering 3A continuous output at 3.3V from a 5–18V input. It integrates power MOSFETs, inductor, and input/output capacitors in a QFN20 (3mm × 5mm × 1.6mm) package and features over-current protection, thermal shutdown, and power-good indication.

For engineers reviewing the EVM3630-QV-00A datasheet, EVM3630-QV-00A pinout, EVM3630-QV-00A application, or EVM3630-QV-00A equivalent, this board enables rapid validation of the MPM3630GQV's performance in space-constrained industrial, telecom, and medical power systems under real load/line regulation conditions.

Technical Context

The EVM3630-QV-00A implements the MPM3630GQV IC - a fully integrated DC/DC step-down module with internal 50mΩ/22mΩ high-side/low-side MOSFETs, fixed 1.4MHz switching frequency, and support for external frequency synchronization (1–2MHz). It operates in power-save mode at light loads to maintain efficiency.

Board-level design includes BST voltage bootstrapping circuitry requiring a Schottky diode from VCC to BST if VIN < 5V, and uses four 0805 ceramic capacitors (two 22μF X5R, one 22pF C0G) plus five precision thick-film resistors for feedback and enable control.

Key Specifications

Availability

EVM3630-QV-00A is available at Aetrix Electronics and suitable for industrial controls, telecom power distribution, and medical imaging equipment requiring stable component supply and fast prototyping of high-density DC/DC conversion.

Supply support for EVM3630-QV-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 MPM3630 product line delivers fully integrated, thermally optimized step-down modules targeting space-constrained applications where layout simplicity, reliability, and time-to-market outweigh discrete design flexibility.

FAQ

What is the purpose of the Schottky diode between VCC and BST on the EVM3630-QV-00A?

A Schottky diode must be added from VCC to BST when input voltage drops below 5V to ensure sufficient gate drive voltage for the high-side MOSFET. Without it, BST voltage may fall below threshold, causing dropout or erratic switching behavior - confirmed in the Quick Start Guide and schematic notes.

Can the output voltage be adjusted, and how?

Yes - though configured for 3.3V out-of-box, the MPM3630GQV supports adjustable output down to 0.6V via external resistor divider on the FB pin. The evaluation board includes R1 (51kΩ) and R3 (0Ω) to set 3.3V; replacing R1/R3 adjusts VOUT per the datasheet equation VOUT = 0.6V × (1 + R1/R3).

Does the EVM3630-QV-00A include thermal management features beyond shutdown?

Yes - the board uses a QFN20 package with exposed thermal pad soldered to a large copper pour on the PCB, and test reports confirm stable operation at 3A with no forced airflow. Thermal shutdown activates only under sustained overload or inadequate board-level copper area, as verified in EVB Test Results (Rev.1.0, p.4).

Is frequency synchronization supported, and what is required to use it?

Yes - the MPM3630GQV supports external clock synchronization from 1MHz to 2MHz via the SYNC pin. To use it, apply a clean CMOS-level square wave to SYNC while disabling internal oscillator; the evaluation board includes unpopulated pads and routing for SYNC signal injection per schematic guidelines.

What are the key differences between the EVM3630-QV-00A and the EVM3630-QV-01A?

The EVM3630-QV-00A (Rev.1.0) uses MPM3630GQV with fixed 3.3V output and no SYNC pull-up; the EVM3630-QV-01A (Rev.1.1) adds a 100kΩ pull-up on SYNC for default free-running mode and revises capacitor placement for improved EMI. Both share identical layout, footprint, and test conditions per MPS documentation.

How is power-good functionality implemented on this board?

PGOOD is routed to a test point and open-drain output pin on U1 (MPM3630GQV). It asserts high (open-drain pulled up externally) when VOUT is within ±10% of target for ≥1ms - validated in EVB Test Results (p.4–5) using oscilloscope waveforms under load transients and startup sequences.