Monolithic Power Systems Inc. EVQ8626-D-00A

Overview

EVQ8626-D-00A from Monolithic Power Systems is an evaluation board for the MPQ8626 synchronous step-down converter IC, delivering 6A continuous output at 1.8V from an 8–16V input. It implements adaptive constant-on-time (COT) control, supports selectable 600/1100/2000kHz switching, and features remote enable (EN), PGOOD monitoring, and soft-start programmability. Designed for PoL validation in telecom and server power rails.

For engineers reviewing the EVQ8626-D-00A datasheet, EVQ8626-D-00A pinout, EVQ8626-D-00A application, or EVQ8626-D-00A equivalent, this board enables rapid characterization of MPQ8626's transient response, efficiency across load range, frequency selection, and startup behavior under pre-bias and light-load conditions.

Technical Context

The EVQ8626-D-00A implements a fixed 1.8V output configuration using the MPQ8626GD QFN2×3mm IC with integrated high- and low-side MOSFETs (R_DS(ON) not specified but optimized for 6A operation). Its COT architecture eliminates external compensation and ensures stability with zero-ESR ceramic output capacitors.

Board-level design includes selectable switching frequency via JP1 jumper, EN logic-referenced to ground (1.5V turn-on threshold), and PGOOD active-low clamping during power failure. Input voltage is constrained to 8–16V by default resistor divider (R3/R4), though minimum VIN can be reduced to 2.85V with external 3.3V VCC bias.

Key Specifications

Availability

EVQ8626-D-00A is available at Aetrix Electronics and suitable for telecom infrastructure, cloud-computing power delivery, and high-end graphics card PoL validation requiring stable component supply and fast design iteration.

Supply support for EVQ8626-D-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 analog and mixed-signal semiconductor company specializing in high-performance power management ICs, with emphasis on efficiency, integration, and thermal robustness.

The MPQ8626 product line targets high-current, space-constrained point-of-load applications where fast transient response, wide input range, and flexible frequency/light-load operation are critical-especially in networking, server, and GPU power systems.

FAQ

What input voltage range does the EVQ8626-D-00A support out of the box?

The board operates from 8V to 16V by default due to the R3/R4 EN bias network. Lower input voltages (down to 2.85V) are achievable by modifying the resistor divider or applying an external 3.3V VCC bias to the VCC pin, as documented in the MPQ8626 datasheet.

Can I change the output voltage from the default 1.8V?

Yes. The output is set by resistive divider R1/R2 (20kΩ/10kΩ on board). Replace R1 and R2 per the MPQ8626 datasheet's V_OUT equation (V_FB = 0.6V) and verify stability with appropriate inductor and output capacitor values.

How do I configure switching frequency and light-load mode?

Use jumper JP1: positions select between 600kHz, 1100kHz, or 2000kHz, and also determine whether the converter operates in pulse-skip or forced continuous conduction mode (CCM) under light load.

Does the board support pre-bias start-up?

Yes. The MPQ8626 IC on this board supports pre-bias start-up, allowing safe turn-on when the output rail already holds residual voltage-critical for hot-swap and multi-rail sequencing applications.

What is the purpose of the PGOOD signal, and how is it implemented?

PGOOD is an active-low open-drain output that asserts high when V_OUT is within ±10% of regulation. During input UVLO, overvoltage, or thermal shutdown, it clamps low-enabling system-level fault detection and sequencing control.

Is the board RoHS-compliant and lead-free?

Yes. All components-including the MPQ8626GD IC-are lead-free, halogen-free, and compliant with the EU RoHS directive. MPS confirms green status per its Quality Assurance documentation.