Monolithic Power Systems Inc. EV2908A-F-02A

Overview

EV2908A-F-02A from Monolithic Power Systems is an evaluation board for the MP2908A/MPQ2908A high-voltage synchronous step-down controller, supporting 6–60V input and delivering regulated 5V/7A output. It implements PWM current-mode control with cycle-by-cycle current limiting, programmable 100–1000kHz switching frequency, and selectable CCM/AAM operation mode. The board is pre-assembled with TSSOP20-EP-packaged MPQ2908AGF and validated for industrial power supply design verification.

For engineers reviewing the EV2908A-F-02A datasheet, EV2908A-F-02A pinout, EV2908A-F-02A application, or EV2908A-F-02A equivalent, this board enables rapid validation of wide-input DC-DC controller performance-including soft-start timing, OVP/OCP response, SYNC clock synchronization, and thermal behavior under 7A load at 60V input.

Technical Context

The EV2908A-F-02A implements a fixed 5V output using R8 = 63.4kΩ and R9 = 12kΩ feedback divider, referencing the controller's 0.8V ±1.5% internal VREF. It supports external frequency synchronization (100–1000kHz) and generates a 180° out-of-phase SYNCO signal in CCM mode for multi-phase coordination.

Board-level protection includes precision output over-voltage protection (OVP), cycle-by-cycle over-current protection (OCP), and thermal shutdown. The dual N-channel MOSFET driver stage uses SQJ850EP devices (60V, 24A, 23mΩ) in synchronous buck topology with 4.7µH power inductor and 220µF POSCAP + 22µF ceramic output capacitance.

Key Specifications

Availability

EV2908A-F-02A is available at Aetrix Electronics and suitable for industrial power supply validation, PoE-powered device development, and high-voltage DC-DC reference design requiring stable component supply, quick-turn prototyping, and production-ready layout verification.

Supply support for EV2908A-F-02A 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 focus on DC-DC conversion, LED drivers, and motor control solutions.

The MP2908A/MPQ2908A product line targets high-input-voltage synchronous buck controllers for industrial, telecom, and automotive auxiliary power applications-designed for reliability under harsh voltage transients and wide ambient temperature ranges.

FAQ

What input voltage range is supported, and what happens above 60V?

The EV2908A-F-02A accepts 6–60V DC input as specified for the MPQ2908AGF controller. Exceeding 60V violates absolute maximum ratings and risks permanent damage to U1, MOSFETs, and input capacitors. Input overvoltage protection is not implemented on this evaluation board.

How is output voltage adjusted, and what tolerance is achievable?

VOUT is set by the R8/R9 resistor divider on FB pin, referencing the 0.8V ±1.5% internal bandgap. With 1% tolerance resistors, output accuracy is ±2.5% over temperature and line/load conditions, verified per typical performance curves in the reference design report.

Can the board operate in forced CCM mode, and how is it enabled?

Yes - tie the CCM/AAM pin (Pin 9) to VCC1 (3.3V or 5V) to force continuous conduction mode. This enables 180° SYNCO output and eliminates diode emulation; AAM is selected by grounding Pin 9. Mode selection is confirmed by measuring gate drive waveforms.

What is the purpose of the VEMI connector, and how should it be used?

VEMI provides a dedicated low-inductance input path for EMI filter components (e.g., common-mode chokes, Y-capacitors). Connect input source between VEMI and GND-not VIN-to bypass board-level input traces and reduce radiated emissions during EMC testing.

Is thermal performance characterized, and what heatsinking is recommended?

Thermal imaging shows U1 junction temperature remains ≤85°C at 7A/60V input with 200LFM airflow. No external heatsink is required; however, the exposed thermal pad of the TSSOP20-EP package must be soldered to PGND/AGND copper pour per MPS layout guidelines.

Does the board support remote sensing, and how is it implemented?

No - the EV2908A-F-02A uses single-point sensing at the output capacitor bank. Remote sensing requires separate FB+ and FB− routing to the load, which is not present. For precision regulation under high-current PCB drops, external compensation or layout revision is necessary.