Monolithic Power Systems Inc. EV1924-S-00A

Overview

EV1924-S-00A from Monolithic Power Systems is a dedicated evaluation board for the MP1924 high-frequency half-bridge gate driver IC, supporting 100V input and 4A load current in buck converter configuration. It features independently controlled high-side and low-side drivers with <5ns propagation delay matching, on-chip bootstrap diode, and 118V bootstrap voltage capability.

For engineers reviewing the EV1924-S-00A datasheet, EV1924-S-00A pinout, EV1924-S-00A application, or EV1924-S-00A equivalent, this board enables rapid validation of MP1924 timing behavior, dead-time implementation, bootstrap operation under 100V VIN, and thermal performance with AM4490N MOSFETs in telecom and avionics DC/DC designs.

Technical Context

The EV1924-S-00A implements the MP1924 (SOIC-8) as a standalone half-bridge driver with independent INH/INL inputs requiring externally generated complementary PWMs with programmable dead time. Its layout integrates discrete bootstrap capacitors (C7–C10), 33μH power inductor (L1), and dual AM4490N MOSFETs (M1/M2) in PowerPAK SO-8 to emulate real-world switching node dynamics.

Board-level protection includes UVLO on both high-side and low-side driver channels, TTL-compatible logic inputs, and quiescent current <150μA. The 6.35cm × 6.35cm PCB uses four internal layers with dedicated SW node copper pour and split ground planes to minimize shoot-through risk and EMI during 20ns typical propagation delay operation.

Key Specifications

Availability

EV1924-S-00A is available at Aetrix Electronics and suitable for telecom power supplies, avionics DC/DC converters, and motor driver reference design validation requiring stable component supply and fast-turn evaluation support.

Supply support for EV1924-S-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 core expertise in DC/DC conversion, gate driving, and motor control solutions.

The MP1924 product line delivers high-frequency half-bridge gate drivers optimized for efficiency-critical 100V-class buck and half-bridge topologies in telecom infrastructure and aerospace power systems.

FAQ

What input voltage range does the EV1924-S-00A support?

The board accepts 0–100 V DC at the VIN terminal, enabling direct evaluation under telecom rectified bus conditions and avionics primary-side voltages. Input filtering uses four parallel 220nF/250V X7R ceramics (C7–C10) and a 100μF/160V electrolytic (C6) to maintain stability across the full range.

How is dead time implemented on this evaluation board?

Dead time is not generated onboard; the EV1924-S-00A requires externally applied complementary PWM signals with user-defined dead time injected at CN4 (INH_EXT and INL_EXT). This preserves full control over timing margins and allows verification of MP1924's <5ns driver matching under real dead-time conditions.

Which MOSFETs are populated on the EV1924-S-00A?

The board uses two AM4490N N-channel MOSFETs in PowerPAK SO-8 package (M1 and M2), rated for 100V VDS and 4A continuous drain current. Their low Qg and matched RDS(on) support clean switching waveforms when driven by the MP1924's 20ns propagation delay outputs.

Does the board include bootstrap capacitor and diode components?

Yes - it integrates an on-chip bootstrap diode within the MP1924 IC and populates four 220nF/250V ceramic capacitors (C7–C10) as the bootstrap network. This eliminates external diode requirements and supports reliable high-side drive up to 118V bootstrap voltage under 100V input.

Can the EV1924-S-00A be used for synchronous buck evaluation?

No - the board implements a standard buck converter with a single high-side switch (M1) and low-side freewheeling diode replaced by M2 as active synchronous rectifier. However, its dual-MOSFET topology and independent INH/INL control fully support synchronous buck characterization when paired with appropriate gate timing.

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

U2, U3, and U4 are dual Schmitt-trigger inverters (NC7WZ14) and a dual OR gate (NC7S32) used to condition external PWM inputs (INH_EXT/INL_EXT) and generate clean, noise-immune INH/INL signals for the MP1924. They ensure TTL-compatible logic levels and improve noise rejection in lab environments.