Analog Devices Inc./Maxim Integrated MAX25240EVKIT#

Overview

The MAX25240EVKIT# from Analog Devices is a fully assembled and tested evaluation kit designed to accelerate development of automotive-grade buck-boost DC-DC converters using the MAX25240 400kHz, 36V, 4.5A converter IC. It features a proven PCB layout, automotive-temperature-rated components, jumper-configurable operation modes (FPWM/skip), spread-spectrum enable, and PGOOD monitoring - all supporting rapid validation in 12V/24V vehicle power systems.

For engineers reviewing the MAX25240EVKIT# datasheet, MAX25240EVKIT# pinout, MAX25240EVKIT# application, or MAX25240EVKIT# equivalent, this kit provides immediate access to key evaluation nodes (SUP, OUT, PGOOD, SYNC, EN), configurable output voltage (3.3V–20V), and verified thermal performance under 4.5A load - enabling fast functional verification without custom board design.

Technical Context

The MAX25240EVKIT# implements the MAX25240AFFF/VY+ variant - a current-mode-controlled buck-boost controller with integrated high-side and low-side power FETs, operating at 400kHz with 11.5V fixed output. It supports input voltages from 4.5V to 40V (with 2V post-startup capability) and delivers up to 4.5A continuous output current with ±2% voltage accuracy.

Key operational features include FSYNC-driven frequency synchronization, spread-spectrum modulation for EMI reduction, FPWM/skip-mode selection via JU2, and PGOOD monitoring with 95% turn-on / 93.5% turn-off thresholds. Test points and jumpers (JU1–JU4) provide direct access to EN, SYNC, PGOOD, and VCC nodes for real-time signal analysis and mode reconfiguration.

Key Specifications

Availability

MAX25240EVKIT# is available at Aetrix Electronics and suitable for automotive infotainment power supplies, ADAS camera modules, and body control unit (BCU) auxiliary rails requiring stable component supply, rapid prototyping, and production-ready reference design validation.

Supply support for MAX25240EVKIT# 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 technologies, serving automotive, industrial, communications, and healthcare markets with precision power, sensing, and timing solutions.

The MAX25240EVKIT# belongs to Analog Devices' automotive power management evaluation platform family, engineered specifically to simplify qualification of wide-input buck-boost converters in harsh 12V/24V vehicle electrical environments.

FAQ

What is the primary IC evaluated by the MAX25240EVKIT#?

The MAX25240EVKIT# evaluates the MAX25240AFFF/VY+ - a 400kHz, 36V, 4.5A automotive buck-boost converter with integrated power FETs, fixed 11.5V output, and current-mode control. This specific variant is pre-installed on the board and validated per the MAX25240 EV Kit Bill of Materials revision 1 (July 2022).

Can the MAX25240EVKIT# evaluate other MAX25240 variants?

Yes - the MAX25240EVKIT# supports evaluation of other MAX25240 variants (e.g., 2MHz versions) with minimal component changes documented in the MAX25240 EV Kit Bill of Materials. The base board layout and test points remain compatible, but inductors, feedback resistors, and input/output capacitors may require substitution per variant requirements.

How is output voltage adjusted on the MAX25240EVKIT#?

The MAX25240EVKIT# ships with a fixed 11.5V output using R7 (294kΩ) and R8 (21kΩ). To adjust output voltage between 3.3V and 20V, remove Rfb and install external resistors Ry and Rx per the formula VOUT = VFB × (1 + Ry/Rx), where VFB = 0.8V (typical) and Rx is selected between 10kΩ and 50kΩ.

What are the default jumper settings on the MAX25240EVKIT#?

The MAX25240EVKIT# defaults to: JU1 (1–2) enabling buck-boost operation; JU2 (1–2) enabling forced-PWM mode; JU3 (2–3) disabling spread spectrum; and JU4 (1–2) connecting PGOOD pull-up to VCC. These settings ensure immediate 11.5V output functionality upon power-up with no configuration required.

Does the MAX25240EVKIT# support synchronization to an external clock?

Yes - the MAX25240EVKIT# provides a dedicated SYNC test point connected to the FSYNC pin of the MAX25240AFFF/VY+. Applying an external clock signal to this node forces PWM operation and synchronizes switching frequency, reducing EMI in multi-rail automotive systems. The FSYNC function is confirmed in the MAX25240 datasheet and implemented on the EV kit schematic.