Monolithic Power Systems Inc. EVM3690-50D-BF-00A

Overview

EVM3690-50D-BF-00A from Monolithic Power Systems is a 10 cm × 10 cm × 1.5 cm evaluation board for the MPM3690GBF-50D synchronous step-down power module, supporting 3.2–16 V input, 1.2 V output at up to 50 A, and PMBus-enabled digital configuration via Virtual Bench Pro 3.0 GUI. It demonstrates fast transient response using constant-on-time (COT) control and achieves 92.95% peak efficiency at 12 V_IN/1.2 V_OUT/15 A.

For engineers reviewing the EVM3690-50D-BF-00A datasheet, EVM3690-50D-BF-00A pinout, EVM3690-50D-BF-00A application, or EVM3690-50D-BF-00A equivalent, this board enables rapid validation of high-current DC/DC conversion in server VRMs, AI accelerators, and telecom baseband power systems with real-time register read/write, thermal performance measurement, and MTP-programmable configuration.

Technical Context

The EVM3690-50D-BF-00A implements a dual-phase, synchronous buck topology using the MPM3690GBF-50D BGA module, which integrates power MOSFETs, drivers, inductors, and compensation circuitry. Its COT control architecture delivers sub-10 µs load-step response without external loop compensation.

Communication occurs over PMBus v1.3 via SDA/SCL pins, supporting telemetry (V_OUT, I_OUT, temperature), fault reporting (OV/UV/OT), and programmable parameters including V_OUT margining, soft-start time, and switching frequency (600 kHz default). MTP memory retains settings across power cycles when written under 8–16 V_IN.

Key Specifications

Availability

EVM3690-50D-BF-00A is available at Aetrix Electronics and suitable for high-density server power delivery, AI GPU voltage regulation, and 5G baseband power system development requiring stable component supply, repeatable lab validation, and digital power management integration.

Supply support for EVM3690-50D-BF-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 and modules, with design centers in the US, China, and Taiwan, and global distribution since 1997.

The EVM3690-50D-BF-00A belongs to MPS's evaluation board product line for digitally configurable power modules, designed specifically to accelerate adoption of PMBus-enabled, high-current DC/DC solutions in cloud infrastructure and edge computing applications.

FAQ

What input voltage range must be applied before enabling PMBus communication?

The EVM3690-50D-BF-00A requires VIN between 8 V and 16 V to write configurations to the MTP memory; however, basic PMBus read operations (telemetry, status) function across the full 3.2–16 V input range once the board is powered and operational. External 3.3 V VCC is needed only if VIN < 4 V.

Does the board support single-phase or dual-phase operation of the MPM3690GBF-50D?

The EVM3690-50D-BF-00A implements the MPM3690GBF-50D in its native dual-phase configuration, as confirmed by the schematic showing two independent SWx, VSxP/VSxN, and PGx signals. Phase interleaving is internal to the module and not user-configurable on this board.

Can output voltage be adjusted beyond the default 1.2 V setting?

Yes - V_OUT is digitally adjustable via PMBus commands (VOUT_COMMAND register) within the MPM3690GBF-50D's supported range (0.6 V to 3.3 V, per datasheet), and changes take effect immediately without hardware modification or resistor rework.

Is an external load required for startup or basic functionality testing?

No - the board starts up autonomously with no initial load (0 A), as stated in the Quick Start Guide. Load is only required during efficiency, ripple, or transient testing; dynamic load circuits are optional and labeled "DNP" in the BOM.

What thermal performance can be expected at full 50 A load without forced airflow?

At 50 A, 12 V_IN, 1.2 V_OUT, and ambient 28°C, the board's case temperature reaches 107°C, verified by thermal imaging in the test report. This reflects the module's integrated thermal pad and 6-layer PCB layout optimized for conduction cooling - no heatsink or fan is required for short-duration validation.