Monolithic Power Systems Inc. EV4420-J-00A

Overview

EV4420-J-00A from Monolithic Power Systems is an evaluation board for the MPQ4420GJ synchronous step-down converter, designed to validate 3.3V/2A power delivery from 4–30V input in automotive and industrial systems. It integrates the TSOT23-8 packaged MPQ4420GJ IC with 90mΩ/55mΩ internal MOSFETs, 410kHz default switching frequency, and supports external clock synchronization from 200kHz to 2.2MHz.

For engineers reviewing the EV4420-J-00A datasheet, EV4420-J-00A pinout, EV4420-J-00A application, or EV4420-J-00A equivalent, this board enables rapid validation of cold-crank operation (high duty cycle), load-dump tolerance (36V transient), power-good signaling, and thermal shutdown behavior under real-world PCB layout and component sourcing conditions.

Technical Context

The EV4420-J-00A implements a complete reference design for the MPQ4420GJ - a current-mode, synchronous buck regulator with integrated high-side and low-side MOSFETs. Its control loop uses internal compensation tuned for 10µH inductors and dual 22µF ceramic output capacitors, delivering stable 3.3V output at up to 2A continuous load.

Board-level features include EN/SYNC pin routing for enable control or external clock synchronization, BST capacitor for gate drive bootstrap, PG signal monitoring, and resistor-divider network (R7=41.2kΩ, R8=13kΩ) pre-configured for 3.3V output with 0.792V feedback reference.

Key Specifications

Availability

EV4420-J-00A is available at Aetrix Electronics and suitable for automotive infotainment power validation, industrial sensor node DC-DC qualification, and distributed power system reference design development requiring stable component supply and documented layout practices.

Supply support for EV4420-J-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 expertise in DC-DC conversion, motor drivers, and LED controllers.

The EV4420-J-00A belongs to MPS's automotive-grade evaluation board portfolio, developed specifically to accelerate adoption of MPQ4420GJ in AEC-Q100-compliant applications demanding robust transient response, thermal reliability, and layout-proven efficiency.

FAQ

What input voltage range is supported during active operation?

The EV4420-J-00A supports continuous 4V to 30V DC input during normal operation. It withstands non-operational 36V transients per automotive load-dump specifications, but sustained operation above 30V may damage the MPQ4420GJ IC or board components.

How is the 3.3V output voltage set and can it be adjusted?

Output voltage is set by the R7–R8 resistor divider on the FB pin, configured for 3.3V using R7=41.2kΩ and R8=13kΩ with a 0.792V internal reference. Adjusting either resistor recalculates VOUT per the formula VOUT = 0.792V × (1 + R7/R8), requiring compensation re-evaluation per the MPQ4420GJ datasheet.

Does the board support external clock synchronization?

Yes - the EN/SYNC pin accepts a 200kHz–2.2MHz external clock signal. When applied after startup, it synchronizes the internal oscillator's rising edge to the external clock's rising edge, with pulse width limited to <1.7µs to avoid timing violation.

What protection features are implemented and how are they verified?

The board demonstrates MPQ4420GJ's built-in OCP (hiccup mode) and thermal shutdown. Over-current triggers automatic restart after cooldown; thermal shutdown activates at ~150°C junction temperature. These are observable via PG deassertion, output collapse, and recovery timing during stress testing.

Is the EN pin internally pulled down, and what are safe drive conditions?

Yes - a 500kΩ internal pull-down to GND allows floating EN to disable the IC. To enable, apply >1.65V; to disable, apply <1.05V. Driving directly from VIN requires series resistance ≥36.7kΩ (for 12V VIN) to limit EN current to <150µA; direct connection to >6V risks zener diode damage.

Can this board be used for AEC-Q100 compliance testing?

The EV4420-J-00A evaluates the AEC-Q100 Grade 1 qualified MPQ4420GJ IC, but the board itself is not certified. It provides a validated layout and BOM for building compliant systems; final qualification requires full-system testing per AEC-Q200 for passives and environmental stress protocols.