Monolithic Power Systems Inc. EVQ8633B-H-LE-00A

Overview

EVQ8633B-H-LE-00A from Monolithic Power Systems is an evaluation board for the MPQ8633B-H synchronous step-down converter, delivering 20A continuous output at 1V from an 8–16V input. It implements adaptive constant-on-time (COT) control, supports remote voltage sensing, and features programmable soft-start (1ms), selectable switching frequency (600/800/1000kHz), and PGOOD signaling. Designed for high-current PoL validation in server and telecom power rails.

For engineers reviewing the EVQ8633B-H-LE-00A datasheet, EVQ8633B-H-LE-00A pinout, EVQ8633B-H-LE-00A application, or EVQ8633B-H-LE-00A equivalent, this board enables rapid characterization of the MPQ8633B-H's transient response, efficiency across 0–20A load range, thermal performance under 12V input, and configuration flexibility via JP1 jumper and resistor-based VOUT setting.

Technical Context

The EVQ8633B-H-LE-00A hosts the MPQ8633B-H QFN-21 (3mm×4mm) IC, which integrates high- and low-side MOSFETs with 3.5mΩ/1.8mΩ R_DS(ON). Its adaptive COT architecture delivers ultra-fast load-step response without external compensation while maintaining stability with zero-ESR ceramic output capacitors.

Board-level design includes differential remote sense traces, a 0.4μH shielded inductor (Wurth WE-744325040), six 47μF X5R output capacitors, and a 220μF bulk input capacitor (Chemi-Con APSG250ELL221MHB5S). EN control is referenced to ground and compatible with 1.5V logic-high / 1V logic-low thresholds.

Key Specifications

Availability

EVQ8633B-H-LE-00A is available at Aetrix Electronics and suitable for server power delivery validation, telecom DC-DC module development, and high-end GPU PoL design requiring stable component supply and documented reference performance.

Supply support for EVQ8633B-H-LE-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, with design centers in the US, China, and Taiwan, and global manufacturing partnerships.

The MPQ8633B-H product line targets high-current, high-efficiency point-of-load conversion in datacenter and networking infrastructure, emphasizing fast transient response, compact footprint, and robust protection for mission-critical 12V-input systems.

FAQ

What input voltage range is supported without modifying the board?

The EVQ8633B-H-LE-00A operates natively from 8V to 16V input. This range is set by the R4/R6 EN bias divider. Lower input voltages (down to 2.7V) require resistor value changes or external EN drive, as specified in the Quick Start Guide.

How is output voltage adjusted on this evaluation board?

VOUT is set using resistive divider R1 (3.4kΩ) and R2 (4.99kΩ) to achieve 1V, referencing the 0.6V internal feedback threshold. To change output voltage, replace R1/R2 per the MPQ8633B-H datasheet equation: VOUT = 0.6V × (1 + R1/R2).

Does the board support remote voltage sensing?

Yes - the EVQ8633B-H-LE-00A implements differential remote sense using dedicated VOUT+ and VOUT− pads adjacent to the output connector. This compensates for PCB trace IR drop and ensures accurate regulation at the load point.

What thermal performance can be expected during full-load operation?

At 12V_IN/1V_OUT/20A, the MPQ8633B-H junction temperature remains below 95°C with 200LFM airflow and no heatsink, per test reports on page 6–10 of the official Rev. 1.0 document. Board copper area and thermal vias are optimized for conduction cooling.

Can the board operate in forced continuous conduction mode (FCCM)?

Yes - JP1 position "FCCM" configures light-load operation in forced CCM, eliminating audible noise and ensuring consistent switching frequency during low-current conditions. Pulse-skip mode is selected via the alternate JP1 position.

Is the PGOOD signal accessible and actively clamped?

PGOOD is routed to a test pad and actively clamped low during power failure or fault conditions (OVP/UVP/OCP/thermal shutdown), providing reliable system-level power sequencing and monitoring without external pull-down components.