Analog Devices Inc./Maxim Integrated MAX42403EVKIT#

Overview

MAX42403EVKIT# from Analog Devices is a fully assembled and tested evaluation kit designed to characterize the MAX42402/MAX42403 high-input-voltage synchronous buck converters. It supports input voltages from 4.5V to 36V, delivers up to 3.5A output current at 3.3V/1.5MHz, features frequency synchronization capability, PGOOD monitoring, and 99% duty-cycle operation for low-dropout performance in industrial power supply validation.

For engineers reviewing the MAX42403EVKIT# datasheet, MAX42403EVKIT# pinout, MAX42403EVKIT# application, or MAX42403EVKIT# equivalent, this board enables rapid functional verification of adjustable-output (0.8V–12V), high-efficiency DC-DC conversion under transient stress (up to 42V input), FPWM/skip-mode control, and PGOOD logic interfacing - all with preconfigured jumpers and test points.

Technical Context

The MAX42403EVKIT# implements a proven PCB layout optimized for thermal management and EMI suppression in high-voltage buck applications. It hosts the MAX42403AFLB+ IC (3.3V, 1.5MHz, 3.5A) and supports variant evaluation via resistor reconfiguration (R4/R5) and inductor swaps (e.g., XAL5050-682ME for 400kHz operation).

Key operational modes include forced PWM (J2 shunt installed) and skip mode (J2 open), with external clock synchronization enabled by removing J2 and driving SYNC. PGOOD status is accessible at a dedicated test point and configurable as a logic signal via J3 pull-up to VBIAS.

Key Specifications

Availability

MAX42403EVKIT# is available at Aetrix Electronics and suitable for industrial power supply validation, embedded DC-DC converter qualification, and high-voltage buck topology prototyping requiring stable component supply and traceable evaluation hardware.

Supply support for MAX42403EVKIT# 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

Analog Devices, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Wilmington, MA.

The MAX42402/MAX42403 product line targets high-input-voltage, high-current synchronous buck conversion in space-constrained industrial and automotive power systems, emphasizing robust transient response and flexible frequency control.

FAQ

What is the default output voltage and switching frequency configured on the MAX42403EVKIT#?

The MAX42403EVKIT# ships with the MAX42403AFLB+ installed, delivering a fixed 3.3V output at 1.5MHz. This configuration uses R4 = 49.9kΩ and R5 = 15.8kΩ per the feedback divider equation, and is verified with C12–C17 = 10µF ceramic output capacitors. The MAX42403EVKIT# can be reconfigured for other voltages or frequencies using documented resistor and inductor changes.

Does the MAX42403EVKIT# support external clock synchronization, and how is it enabled?

Yes, the MAX42403EVKIT# supports external clock synchronization via the SYNC pin. To enable it, remove the shunt from jumper J2 (pins 1–2), then apply an external clock signal to the SYNC test point. When driven externally, the MAX42403AFLB+ operates in forced-PWM mode across all load conditions - a behavior confirmed in the MAX42403EVKIT# schematic and Quick Start procedure.

How is the PGOOD signal accessed and conditioned on the MAX42403EVKIT#?

The PGOOD signal is available at a dedicated test point and functions as an open-drain output. By default, jumper J3 is installed to pull PGOOD up to VBIAS, converting it into a logic-compatible signal that goes low when VOUT deviates beyond ±4% to ±7% of nominal. This configuration matches the MAX42403AFLB+'s internal PGOOD threshold specification and is validated in the EV kit's Detailed Description section.

Can the MAX42403EVKIT# evaluate both MAX42402 and MAX42403 variants, and what changes are required?

Yes, the MAX42403EVKIT# evaluates all MAX42402/MAX42403 variants with minimal changes. For example, swapping L2/L3 for a 6.8µH inductor (XAL5050-682ME) and updating R4/R5 allows evaluation of the 400kHz variant. Output current capability differs: MAX42403 supports up to 3.5A, while MAX42402 is rated for 2.5A - a distinction reflected in the Bill of Materials and General Description.

What safety and handling precautions are specified for initial use of the MAX42403EVKIT#?

The MAX42403EVKIT# documentation mandates ESD-safe handling during unboxing and visual inspection for shipping damage. Power-up requires connecting VSUP/GND2 to a 14V/3A-limited supply, verifying 3.3V at VOUT/GND3 before applying load. All jumpers must be confirmed in default positions (J1/J2/J3/J4 per Table 1) prior to operation - a step explicitly required in the Quick Start procedure to ensure correct EN, SYNC, PGOOD, and spread-spectrum settings.