Monolithic Power Systems Inc. EV4460DQ-01B

Overview

EV4460DQ-01B from Monolithic Power Systems is an evaluation board for the MP4460DQ synchronous step-down converter IC, supporting 7.5–36V input, 3.3V/2.5A output, 4MHz switching frequency, 95% peak efficiency, and ceramic-capacitor stability. It enables rapid validation of high-frequency DC/DC conversion in automotive and industrial power systems.

For engineers reviewing the EV4460DQ-01B datasheet, EV4460DQ-01B pinout, EV4460DQ-01B application, or EV4460DQ-01B equivalent, this board provides verified layout, BOM, thermal performance data, and EN/FREQ/COMP interface access for real-world design integration and parametric tuning.

Technical Context

The EV4460DQ-01B implements the MP4460DQ QFN10-based buck regulator with internal 100mΩ high-side MOSFET and integrated gate driver. Its 4MHz fixed-frequency operation enables compact magnetics (10µH inductor) and avoids AM-band EMI interference.

Board-level features include programmable UVLO (preset at 7.5V via R1/R2), adjustable output voltage (via R4/R6 divider targeting 0.8V FB reference), and frequency reprogramming (via R3, default 500kHz, scalable to 4MHz with external bootstrap diode).

Key Specifications

Availability

EV4460DQ-01B is available at Aetrix Electronics and suitable for automotive infotainment power supplies, industrial PLC I/O modules, and battery-powered test equipment requiring stable component supply and fast prototyping turnaround.

Supply support for EV4460DQ-01B 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 core expertise in DC/DC conversion, LED drivers, and motor control solutions.

The MP4460 product line delivers high-frequency, high-efficiency buck regulators for space-constrained applications where EMI reduction, wide VIN range, and low quiescent current are critical - especially in automotive and industrial environments.

FAQ

What input voltage range is supported on the EV4460DQ-01B?

The board supports 7.5V to 36V DC input, enabled by the MP4460DQ's integrated UVLO circuitry. The default UVLO threshold is set to 7.5V using resistor divider R1 (24.9kΩ) and R2 (100kΩ), per the rising-edge EN threshold of 1.5V.

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

The output is set to 3.3V using R4 (40.2kΩ) and R6 (124kΩ) in the feedback network, referencing the 0.8V internal FB pin. Output voltage can be recalculated and reconfigured using R1 = 50.25 × (VOUT − 0.8) kΩ, with compensation components adjusted per the MP4460 datasheet.

What is required to operate the board at 4MHz switching frequency?

To run at 4MHz, R3 must be replaced with a 0Ω resistor (or omitted), and an external bootstrap diode (e.g., B340A-13-F) must be added from a 5V supply to the BST pin. This compensates for reduced charge time at high frequencies and ensures robust high-side gate drive.

Does the board include thermal protection and soft-start functionality?

Yes - the underlying MP4460DQ IC integrates thermal shutdown and internal soft-start (typical 2ms). The board exposes the COMP pin for optional loop compensation tuning but does not require external soft-start circuitry due to the IC's built-in ramp generator.

Can the enable (EN) function be used to control power sequencing?

Yes - the EN pin accepts TTL/CMOS logic: drive >1.5V (rising) to enable regulation, <1.2V (falling) to disable. This allows precise power-up/down sequencing with external controllers, microcontrollers, or supervisor ICs without modifying board hardware.

Is the EV4460DQ-01B RoHS-compliant and lead-free?

Yes - all components on the EV4460DQ-01B, including the MP4460DQ QFN10 IC, Sumida inductor, Murata capacitors, and Panasonic resistors, meet RoHS Directive 2011/65/EU and are lead-free, halogen-free, and compliant with MPS's environmental policy.