Monolithic Power Systems Inc. EV1925-R-00A

Overview

EV1925-R-00A from Monolithic Power Systems is an evaluation board for the MP1925 high-frequency half-bridge gate driver IC, supporting 100V input, 4A load current, and <5ns high-side/low-side propagation delay matching. It implements a buck converter topology with independent INH/INL inputs, on-board bootstrap diode, and QFN-8 (4mm×4mm) mounted MP1925GR IC.

For engineers reviewing the EV1925-R-00A datasheet, EV1925-R-00A pinout, EV1925-R-00A application, or EV1925-R-00A equivalent, this board enables rapid validation of high-speed gate drive timing, bootstrap voltage margin up to 115V, UVLO behavior under VDD=8–15V, and dead-time-sensitive PWM interface design for motor and telecom DC/DC systems.

Technical Context

The EV1925-R-00A implements a functional buck converter using the MP1925 gate driver to control two external N-channel MOSFETs (AM4490N), with SW node routed to onboard inductor L1 (33μH) and output capacitors (330μF/35V + 4×22μF/25V). Input voltage range is 0–100V, and driver supply VDD is 8–15V.

Independent TTL-compatible INH and INL inputs require externally generated complementary PWM signals with controlled dead time; DRVH and DRVL outputs drive high-side and low-side gates respectively, with matched propagation delay (<5ns) and integrated bootstrap diode enabling 115V bootstrap voltage capability.

Key Specifications

Availability

EV1925-R-00A is available at Aetrix Electronics and suitable for motor driver development, telecom half-bridge power supplies, and avionics DC/DC converter prototyping requiring stable component supply, traceable sourcing, and documented reference design validation.

Supply support for EV1925-R-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 global design, sales, and support operations.

The MP1925 product line delivers high-frequency, matched half-bridge gate drivers for compact, high-efficiency DC/DC conversion in space-constrained telecom, industrial, and aerospace applications.

FAQ

What input voltage range does the EV1925-R-00A support?

The board accepts 0–100V DC input voltage at the VIN terminals. This range aligns with the MP1925's specified input capability and enables testing under telecom and avionics bus conditions. The onboard AM4490N MOSFETs are rated for 100V drain-source voltage, and the 220nF/250V ceramic capacitors (C7–C10) provide robust input filtering within this range.

How is dead time managed on this evaluation board?

Dead time is not generated on-board; it must be implemented externally via complementary PWM signals applied to CN3 (INH_EXT) and CN4 (INL_EXT). The board provides direct access to INH and INL pins of the MP1925, which are TTL-compatible and independently controlled - requiring precise external timing coordination to prevent shoot-through.

Does the EV1925-R-00A include the MP1925 IC?

Yes - the board integrates the MP1925GR IC in an SOIC-8 package (U1), as confirmed by the Bill of Materials and schematic. This is the production-grade version of the gate driver, not a sample or placeholder device, and operates with full specification compliance including <5ns channel matching and on-chip bootstrap diode functionality.

What is the purpose of the NC7S32 and NC7WZ14 logic devices on the board?

U3 (NC7S32 dual OR gate) and U2/U4 (NC7WZ14 dual Schmitt-trigger inverters) condition external PWM signals: U3 combines INH_INT and INH_EXT for flexible signal routing, while U2/U4 provide noise-immune inversion and level-shifting for clean INH/INL transitions into the MP1925, improving timing integrity in noisy lab environments.

Can the EV1925-R-00A be used for synchronous rectification?

No - the board implements a standard buck topology with high-side and low-side N-MOSFETs driven by DRVH and DRVL, but lacks synchronous rectifier control logic or dedicated SR gate drive outputs. It is designed for gate driver validation, not self-synchronizing operation; external controller logic is required to implement synchronous rectification.

What output capacitance is installed for load regulation testing?

The board uses a 330μF/35V electrolytic capacitor (C15) as the primary output filter, supplemented by four parallel 22μF/25V ceramic capacitors (C11–C14) for high-frequency decoupling. This 418μF total capacitance supports stable 4A load current delivery and transient response validation per the MP1925's recommended buck design guidelines.