Analog Devices Inc./Maxim Integrated MAX25223EVKIT#

Overview

MAX25223EVKIT# from Analog Devices is an evaluation kit designed to validate the MAX25223 2.1MHz/400kHz automotive-grade synchronous buck converter in a 20-pin side-wettable TQFN package. It delivers up to 3.5A at 5V or 3.3V output, supports 3.5V–36V input, includes PGOOD monitoring and frequency synchronization, and is fully assembled for immediate bench testing in vehicle power systems.

For engineers reviewing the MAX25223EVKIT# datasheet, MAX25223EVKIT# pinout, MAX25223EVKIT# application, or MAX25223EVKIT# equivalent, this kit enables rapid validation of input transient resilience (up to 42V), forced-PWM/skip-mode operation, PGOOD logic interfacing via J1 shunt, and variant evaluation (e.g., 3.3V/2.1MHz or 400kHz) with minimal BOM changes.

Technical Context

The MAX25223EVKIT# implements a complete reference design for the MAX25223 buck controller, featuring a 2.2µH power inductor (Coilcraft XAL6030-222), 47µF aluminum electrolytic input capacitor, and four 10µF ceramic output capacitors. It supports dual switching modes-forced-PWM (via FSYNC high) and skip mode (via FSYNC low)-to optimize efficiency across load ranges.

PGOOD monitoring is implemented with a dedicated test point and configurable pull-up via jumper J1 to VBIAS; the output is low-impedance when OUT is within ±2% regulation and high-impedance if voltage drops >8% below nominal. The board accommodates 400kHz variants using an 8.2µH inductor and 44µF effective output capacitance after derating.

Key Specifications

Availability

MAX25223EVKIT# is available at Aetrix Electronics and suitable for automotive ADAS power supply validation, infotainment system DC-DC prototyping, and body electronics ECU development requiring stable component supply and AEC-Q100-compliant reference designs.

Supply support for MAX25223EVKIT# 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 MAX25223 product line targets automotive power conversion applications, delivering miniaturized, high-efficiency buck regulators optimized for space-constrained ECU designs with stringent transient and thermal requirements.

FAQ

What is the default output configuration of the MAX25223EVKIT#?

The MAX25223EVKIT# ships with the MAX25223ATPA/VY+ installed, providing a fixed 5V output at 2.1MHz switching frequency. Output voltage is verified at 5V ±2% under 3.5A load. Jumper settings (EN middle-ON, FSYNC middle-PWM) configure it for forced-PWM operation out-of-box. The MAX25223EVKIT# does not require firmware or configuration to deliver regulated 5V output.

Can the MAX25223EVKIT# evaluate 400kHz variants of the MAX25223?

Yes - the MAX25223EVKIT# supports 400kHz operation with component changes: replace L2 with an 8.2µH inductor and ensure ≥44µF effective output capacitance after derating. The schematic and layout are validated for both 2.1MHz and 400kHz frequencies, maintaining stability and thermal performance. No PCB modification is needed beyond passive component swaps.

How is PGOOD functionality implemented on the MAX25223EVKIT#?

The MAX25223EVKIT# provides a dedicated PGOOD test point tied to the MAX25223's open-drain output. Installing the shunt on jumper J1 pulls PGOOD up to VBIAS, generating a logic-compatible signal. PGOOD asserts low when VOUT is within ±2% of regulation and goes high-impedance if VOUT drops >8% below nominal - enabling reliable system power sequencing in automotive ECUs using the MAX25223EVKIT#.

Does the MAX25223EVKIT# support spread spectrum operation?

No - spread spectrum is disabled by default on the MAX25223EVKIT#. Jumper SPS is set to Middle-OFF per Table 1, and no spread-spectrum clocking components are populated. The MAX25223EVKIT# supports only forced-PWM and skip-mode operation via the FSYNC pin; spread spectrum requires a different variant or custom design not implemented on this evaluation platform.

What equipment is required to operate the MAX25223EVKIT#?

A 14V/3A power supply, voltmeter, and electronic load are required to verify MAX25223EVKIT# operation per the Quick Start procedure. Test points (SUP, GND, VOUT, GND2, PGOOD) allow direct probing without soldering. All jumpers are pre-configured; no additional tools or programming hardware are needed to measure 5V output regulation, PGOOD assertion, or load-step response using the MAX25223EVKIT#.