Analog Devices Inc./Maxim Integrated MAX25255DUALEVKIT#

Overview

MAX25255DUALEVKIT# from Analog Devices is a fully assembled and tested evaluation kit designed to characterize the dual-phase synchronous buck operation of the MAX25254/MAX25255 automotive DC-DC converters. It integrates the MAX25255DAFDA/VY+ (3.3V fixed, 2MHz, 12A per phase), supports 3V–36V input, delivers up to 12A total output, and includes PGOOD monitoring, SYNC input, and configurable EXTVCC sourcing for efficiency optimization in automotive power systems.

For engineers reviewing the MAX25255DUALEVKIT# datasheet, MAX25255DUALEVKIT# pinout, MAX25255DUALEVKIT# application, or MAX25255DUALEVKIT# equivalent, this kit enables rapid validation of dual-phase buck converter performance-including transient response, light-load efficiency in skip mode, PGOOD behavior, and synchronization with external clocks-under real-world automotive voltage and load conditions.

Technical Context

The MAX25255DUALEVKIT# implements a proven PCB layout for the MAX25255's F2CQFN23 package, supporting dual-phase interleaved operation with independent EN1/EN2 control and synchronized switching via the SYNC pin. It accommodates both forced-PWM and skip-mode operation, with automatic mode selection based on SYNC logic level.

Hardware features include jumper-configurable EXTVCC sourcing (VSUPF or VOUT), selectable BIAS LDO input, test points for PGOOD1/PGOOD2 (active-low open-drain), and provision for voltage adjustment (0.8V–14V) by replacing U1 and modifying R8/R9. The board handles 42V input transients and uses optimized inductor selections (L2/L3 = 0.47µH, 22.3A) for 2MHz operation.

Key Specifications

Availability

MAX25255DUALEVKIT# is available at Aetrix Electronics and suitable for automotive ADAS power supply validation, infotainment system DC-DC design verification, and industrial 24V rail conversion requiring stable component supply and repeatable bench characterization.

Supply support for MAX25255DUALEVKIT# 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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving automotive, industrial, communications, and healthcare markets with precision power, sensing, and timing solutions.

The MAX25255DUALEVKIT# belongs to Analog Devices' automotive-grade power management evaluation platform family, engineered specifically to accelerate development of robust, AEC-Q100-compliant dual-phase buck regulators for 12V/24V vehicle subsystems.

FAQ

What IC does the MAX25255DUALEVKIT# evaluate out-of-the-box?

The MAX25255DUALEVKIT# ships with the MAX25255DAFDA/VY+ pre-installed-a 3.3V fixed-output, 2MHz, dual-phase synchronous buck controller rated for 12A total output. This variant is optimized for automotive applications requiring compact, high-frequency power conversion with low EMI and fast transient response. The kit also supports evaluation of other MAX25254/MAX25255 variants with minimal component changes.

Can the MAX25255DUALEVKIT# be used to evaluate adjustable-output versions of the MAX25255?

Yes, the MAX25255DUALEVKIT# supports adjustable-output operation from 0.8V to 14V by removing U1 (MAX25255DAFDA/VY+) and installing an adjustable variant, then populating R8 and R9 per the feedback divider equation (VOUT = VFB × (1 + R8/R9), where VFB = 0.8V). R5 must be removed and R7 replaced with a 0Ω resistor to enable external feedback configuration.

How does the SYNC pin function on the MAX25255DUALEVKIT#?

On the MAX25255DUALEVKIT#, the SYNC pin controls operating mode and enables external clock synchronization. When pulled high (default via JU_SYNC shunt), the MAX25255DAFDA/VY+ operates in forced-PWM mode across all loads. When pulled low, it automatically switches between skip mode (light loads) and PWM mode (heavy loads). Connecting an external clock to SYNC forces FPWM and aligns switching edges to that clock source.

What is the purpose of the JU_EXTVCC jumper on the MAX25255DUALEVKIT#?

The JU_EXTVCC jumper on the MAX25255DUALEVKIT# selects the input source for the internal 1.8V BIAS LDO: either VSUPF (main input) or VOUT (buck output). When connected to VOUT, the BIAS LDO draws current proportional to duty cycle, reducing quiescent power and improving light-load efficiency. If VOUT drops below 2.40V, the IC automatically reverts to VSUPF to maintain bias stability.

Does the MAX25255DUALEVKIT# support 400kHz operation?

Yes, the MAX25255DUALEVKIT# supports 400kHz operation through component changes documented in its Bill of Materials-specifically, replacing L2 and L3 with 2.2µH inductors (XEL6060-222ME) and updating input/output capacitors per the 400kHz BOM section. This lower frequency improves efficiency at higher currents but requires revalidation of loop stability and thermal performance.