Analog Devices Inc./Maxim Integrated MAX5042EVKIT

Overview

MAX5042EVKIT from Maxim Integrated is an evaluation kit for the MAX5042 two-switch isolated PWM power IC - a high-voltage (20V–76V), 50W-capable, thermally enhanced 56-pin TQFN controller with integrated hot-swap functionality and synchronous rectification support. It enables rapid prototyping of forward/flyback telecom power supplies operating from 48V backplanes.

For engineers reviewing the MAX5042EVKIT datasheet, MAX5042EVKIT board layout, MAX5042EVKIT application circuit, or MAX5042EVKIT compatible power IC alternatives, this kit provides validated reference design, thermal performance data, and hot-swap startup waveform capture - critical for 48V distributed power system qualification and secondary-side synchronous rectifier timing alignment.

Technical Context

The MAX5042EVKIT implements a complete isolated forward converter using the MAX5042ATN IC, featuring integrated 75mΩ high-voltage power MOSFETs, feed-forward voltage- or current-mode control, and a dedicated look-ahead signal (PPWM) for driving secondary-side synchronous rectifiers. It supports up to 500kHz switching and includes on-board RCOSC timing components, soft-start capacitor, and fault integration network.

Board-level features include hot-swap enable monitoring via HSEN/HSOK signals, isolated gate drive paths for external QHS MOSFET, and Kelvin-connected current-sense inputs (CSP/CSN) for accurate primary-side current limiting. The kit operates across –40°C to +125°C ambient and delivers >90% efficiency when paired with synchronous rectification.

Key Specifications

Availability

MAX5042EVKIT is available at Aetrix Electronics and suitable for telecom power supply development, 48V router/switch card qualification, and distributed power system validation requiring stable component supply and documented thermal performance.

Supply support for MAX5042EVKIT 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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management solutions for demanding industrial and communications applications.

The MAX5042 product line targets isolated DC-DC conversion in high-reliability telecom/datacom systems - designed specifically for 48V backplane environments where hot-swap inrush control, transformer reset elimination, and synchronous rectification timing are critical.

FAQ

What is the primary function of the MAX5042EVKIT?

The MAX5042EVKIT is an evaluation platform for the MAX5042 two-switch isolated PWM power IC. It demonstrates a fully assembled, thermally optimized forward converter design supporting 48V input, hot-swap inrush limiting, and secondary-side synchronous rectification timing via the PPWM signal. The MAX5042EVKIT includes all necessary passive components, test points, and layout documentation to accelerate design-in of the MAX5042ATN in telecom power applications.

Does the MAX5042EVKIT support both forward and flyback topologies?

Yes - the MAX5042EVKIT is configured as a forward converter by default, but its underlying MAX5042ATN IC supports both forward and flyback topologies. Layout provisions and pin access (XFRMRH/XFRMRL/SRC/DRNH) allow reconfiguration for flyback operation, though maximum output power drops to ~20W due to transformer energy storage limits. The MAX5042EVKIT user guide includes flyback schematic variants and transformer selection guidance.

How does the MAX5042EVKIT implement hot-swap control?

The MAX5042EVKIT leverages the integrated hot-swap controller in the MAX5042ATN IC. It uses external components - including an external N-channel MOSFET (QHS), HSEN voltage divider, and HSOK pull-up - to achieve controlled inrush into the bulk input capacitor (CIN). Startup delay is factory-trimmed to 165ms, and hot-swap gate slew rate is set to ~10V/ms, limiting peak inrush current to ~1A per 100µF of CIN capacitance - directly validated on the MAX5042EVKIT board.

Can the MAX5042EVKIT be used to evaluate synchronous rectification timing?

Yes - the MAX5042EVKIT provides direct access to the PPWM signal (Pin 37), which leads the internal power MOSFET gate pulses by a skew adjustable via the DRVDEL network (R/C to PWMNEG). This allows precise optimization of secondary-side synchronous rectifier turn-on timing relative to transformer reset. Test points and oscilloscope connectors on the MAX5042EVKIT enable measurement of PPWM-to-XFRMRL timing, critical for minimizing body-diode conduction loss.

What thermal design features are implemented on the MAX5042EVKIT?

The MAX5042EVKIT implements best-practice thermal management for the 56-pin TQFN package: the exposed metal pad is soldered directly to a large NEGIN copper pour with ≥6 thermal vias to inner ground planes; the PCB uses 2oz copper; and high-power traces (DRNH, XFRMRH, SRC) are widened and short. This configuration sustains full 50W output at +70°C ambient and supports continuous operation up to +125°C junction temperature - verified in the MAX5042EVKIT thermal characterization report.