Analog Devices Inc./Maxim Integrated MAX25231EVKIT#

Overview

MAX25231EVKIT# from Maxim Integrated is a fully assembled and tested evaluation kit designed to validate the MAX25231 2.1MHz automotive-grade synchronous buck converter in 12-pin TDFN, supporting 3.5V–36V input, 5V/3.3V fixed or 1V–10V adjustable output, up to 1.2A load, and frequency synchronization - used for rapid prototyping of 12V/24V automotive power rails.

For engineers reviewing the MAX25231EVKIT# datasheet, MAX25231EVKIT# pinout, MAX25231EVKIT# application, or MAX25231EVKIT# equivalent, this board enables functional validation of PGOOD monitoring, EN control, SYNC-driven PWM/skip mode selection, and output voltage adjustment via external resistor dividers under transient and steady-state conditions.

Technical Context

The MAX25231EVKIT# implements the MAX25231ATCA/V+ variant - a high-voltage synchronous buck controller with integrated MOSFET drivers, operating at 2.1MHz fixed switching frequency and supporting forced-PWM or skip-mode operation via the SYNC pin. It features internal 1V feedback reference and delivers regulated output with ±1.5% initial accuracy over temperature.

PGOOD logic is implemented using an open-drain output referenced to VBIAS, asserting low when OUT deviates >±6.5% from nominal; EN enables/disables regulation with 1.2V threshold; and the PCB layout complies with automotive EMI and thermal requirements per AEC-Q200 component stress levels.

Key Specifications

Availability

MAX25231EVKIT# is available at Aetrix Electronics and suitable for automotive ADAS camera modules, infotainment head units, and body control modules requiring stable component supply, fast design validation, and AEC-Q200-aligned power architecture verification.

Supply support for MAX25231EVKIT# 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

Maxim Integrated, now part of Analog Devices, designs precision analog, mixed-signal, and power-management ICs for automotive, industrial, and communications applications.

The MAX25231 product line targets automotive power conversion with high-voltage input tolerance, small-footprint packaging, and robust fault monitoring - specifically engineered for space-constrained 12V/24V subsystems.

FAQ

What does the MAX25231EVKIT# evaluate?

The MAX25231EVKIT# evaluates the MAX25231 synchronous buck converter, specifically the MAX25231ATCA/V+ variant installed on-board. It validates full functionality including input transient handling up to 42V, PGOOD assertion timing, EN enable/disable behavior, SYNC-controlled PWM/skip mode, and output voltage adjustability via external resistors. All test points and jumpers are pre-configured for immediate 5V operation.

Can the MAX25231EVKIT# be used with other MAX25231 variants?

Yes, the MAX25231EVKIT# supports evaluation of all MAX25231 variants (e.g., MAX25231ATCA/V+ for 5V, MAX25231ATDA/V+ for 3.3V) with minimal U1 component change. The board's feedback network and layout accommodate fixed-output and adjustable versions; only the IC and optional R1/R4/R5/R6 configuration need updating per target output voltage.

How is PGOOD monitored on the MAX25231EVKIT#?

PGOOD is accessible at the PGOOD test point and functions as an open-drain output. When OUT is within ±6.5% of regulation, PGOOD pulls low; otherwise it floats high-impedance. To convert to a logic signal, install shunts on PU and LED jumpers to pull PGOOD up to VBIAS - enabling direct connection to MCU reset or supervisor inputs on the MAX25231EVKIT#.

What power supply requirements apply to the MAX25231EVKIT#?

The MAX25231EVKIT# requires a 3.5V–36V, 2A DC power supply connected to SUP and GND test pads. For default 5V operation, set the supply to 14V with 2A current limit. Input capacitance (C1, C2, C3, C10, C11) is optimized for stability across the full range, and the board tolerates automotive transients up to 42V without damage or latch-up.

Does the MAX25231EVKIT# support adjustable output voltage?

Yes, the MAX25231EVKIT# supports adjustable output from 1V to 10V. To configure, remove R1, install a 0Ω resistor at R4, and populate R5 and R6 per the equation VOUT = VFB × (1 + R5/R6), where VFB = 1V (typ). The board includes dedicated pads and routing for this configuration, verified with ±1.5% output accuracy across temperature and load.