Monolithic Power Systems Inc. EV8771-Q-00A

Overview

EV8771-Q-00A from Monolithic Power Systems is an evaluation board for the MP8771GQ synchronous step-down converter IC, demonstrating a 17V-input, 1V/10A output power stage operating at 700kHz with QFN-16 (3mm×3mm) packaging, optimized for high-efficiency point-of-load regulation in space-constrained applications.

For engineers reviewing the EV8771-Q-00A datasheet, EV8771-Q-00A pinout, EV8771-Q-00A application, or EV8771-Q-00A equivalent, this board enables rapid validation of constant-on-time control loop stability, thermal performance under 10A load, soft-start sequencing, and protection behavior including SCP hiccup mode and thermal shutdown-critical for security camera and set-top box power designs.

Technical Context

The EV8771-Q-00A implements the MP8771GQ's fixed 700kHz switching frequency and constant-on-time (COT) control architecture, delivering tight line/load regulation (<±0.5%) across 4.5–17V input and 0.6–1.8V adjustable output. It integrates 17mΩ/8mΩ internal high-side/low-side MOSFETs and supports pre-biased startup.

Board-level design includes a 0.56µH shielded inductor (Wurth 744355256), six 22µF X5R ceramic output capacitors (Murata GRM21BR61E226ME44L), and discrete feedback resistors (R1=20kΩ, R2=30kΩ) setting VOUT to 1V. EN and PG signals are routed for external power sequencing validation.

Key Specifications

Availability

EV8771-Q-00A is available at Aetrix Electronics and suitable for security camera power supplies, digital set-top box POL rails, and flat-panel display logic voltage regulation requiring stable component supply, fast design validation cycles, and production-ready reference schematics.

Supply support for EV8771-Q-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 over two decades of leadership in DC/DC conversion, motor drivers, and LED lighting controllers.

The EV8771-Q-00A belongs to MPS's evaluation board portfolio for its MP8771 product line-designed specifically to accelerate adoption of high-current, high-frequency synchronous buck converters in consumer and surveillance equipment where small size and fast transient response are critical.

FAQ

What input voltage range is validated on the EV8771-Q-00A board?

The board is fully characterized across 4.5V to 17V input, with published efficiency, line regulation, and thermal data at 5V, 12V, and 17V. Input capacitors (six 22µF X5R) and layout support stable operation within this full range without derating.

Can the output voltage be adjusted, and how is it configured?

Yes-output is factory-set to 1V using R1 (20kΩ) and R2 (30kΩ) in the FB divider, but can be adjusted from 0.6V to 1.8V by replacing these resistors. The MP8771's reference voltage is 0.6V, and the feedback network directly scales VOUT per the standard buck equation.

Does the board support power sequencing via EN and PG pins?

Yes-EN and PG signals are accessible via test points and headers. EN accepts 0–5V logic; >1.2V enables regulation, <0.9V disables it. PG asserts high when VOUT is within ±10% tolerance, enabling coordinated multi-rail startup/shutdown in systems like STBs.

What inductor and output capacitors are used, and are they production-grade?

The board uses Wurth 744355256 (0.56µH, 30A saturation current) and Murata GRM21BR61E226ME44L (22µF, 25V X5R, 0805) - all AEC-Q200–compatible, automotive-qualified components selected for low DCR, high ripple current handling, and long-term reliability.

How is short-circuit protection implemented and verified?

SCP triggers hiccup-mode operation: the MP8771 shuts down for ~30ms upon current limit detection, then retries. Board test reports confirm clean entry into and recovery from sustained short-circuit events at both light and full load, with no latch-up or thermal runaway observed.

Is thermal performance documented, and what is the max ambient temperature for 10A operation?

Thermal images and temperature rise data show ≤25°C rise above ambient at 10A/12V input with 200LFM airflow. Full thermal characterization is provided in the Rev.1.0 user guide, confirming reliable operation up to +70°C ambient without derating.