Analog Devices Inc./Maxim Integrated MAX17681EVKITD#

Overview

MAX17681EVKITD# from Maxim Integrated is an evaluation kit for the MAX17681 high-voltage iso-buck DC-DC converter IC, enabling rapid prototyping of isolated 5W power supplies with primary-side regulation. It supports 4.5V–42V input, delivers up to 24V/100mA secondary output via a 1:2.4 transformer, and implements peak-current-mode control with integrated 0.85Ω high-side pMOS and 0.35Ω low-side nMOS switches.

For engineers reviewing the MAX17681EVKITD# datasheet, MAX17681EVKITD# pinout, MAX17681EVKITD# application, or MAX17681EVKITD# equivalent, this kit provides validated reference design, thermal performance data, hiccup-mode fault response verification, and soft-start timing characterization - all critical for industrial isolated supply qualification in PLC I/O modules and smart meters.

Technical Context

The MAX17681EVKITD# implements the MAX17681 iso-buck topology using a synchronous half-bridge driver, primary-side feedback (via FB pin), and transformer-coupled energy transfer without optocouplers. It operates at 200kHz switching frequency with programmable EN/UVLO threshold (1.218V typ) and adjustable soft-start (via SS pin capacitor).

This kit validates key system-level behaviors: primary output voltage regulation (0.9V to 0.96×VIN), ±1.7% feedback accuracy, robust hiccup-mode protection triggered by primary undervoltage (70.5% VPRI) or runaway current limit (1.7A), and RESET assertion during thermal shutdown or FB dropout.

Key Specifications

Availability

MAX17681EVKITD# is available at Aetrix Electronics and suitable for industrial power design, isolated interface development, and medical floating supply validation requiring stable component supply and full documentation traceability.

Supply support for MAX17681EVKITD# 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 industrial, automotive, and communications applications.

The MAX17681EVKITD# belongs to Maxim's iso-buck evaluation platform family, developed specifically to accelerate adoption of optocoupler-free isolated DC-DC conversion in space-constrained, high-reliability industrial systems.

FAQ

What is the primary function of the MAX17681EVKITD#?

The MAX17681EVKITD# is an evaluation kit for the MAX17681 iso-buck DC-DC controller IC. It provides a fully assembled, tested reference design that demonstrates isolated 5W power generation using primary-side regulation - eliminating optocouplers and simplifying layout. The MAX17681EVKITD# enables engineers to validate transformer selection, soft-start timing, hiccup-mode behavior, and thermal performance before custom board design.

Does the MAX17681EVKITD# support the MAX17681A variant?

No, the MAX17681EVKITD# is designed and validated exclusively for the MAX17681 IC. It does not implement or enable the MAX17681A's enhanced secondary-side overcurrent protection or dual-rail soft-start recovery. The kit's schematic, BOM, and test reports reflect MAX17681-specific parameters including hiccup trigger at 70.5% VPRI and absence of 16-cycle negative-current detection logic.

What output configurations can be implemented with the MAX17681EVKITD#?

The MAX17681EVKITD# delivers a single regulated isolated output - demonstrated as 24V/100mA using a 1:2.4 transformer (T1) and external rectification. By modifying the FB resistor divider (R1/R2), users can set primary output voltage between 0.9V and 0.96×VIN; combined with different transformer turns ratios, this supports outputs such as 5V, 12V, or 15V on the secondary side - all while maintaining primary-side regulation integrity.

How is overcurrent protection verified on the MAX17681EVKITD#?

Overcurrent protection on the MAX17681EVKITD# is verified through three mechanisms: (1) cycle-by-cycle peak current limiting at 1.65A (typ), (2) runaway current limiting at 1.7A (typ), and (3) hiccup-mode entry when primary output drops to 70.5% of nominal after soft-start. The kit includes test points and documented waveforms showing LX current, VPRI, and RESET response under short-circuit conditions - confirming reliable shutdown and auto-recovery behavior per MAX17681 specifications.

Can the MAX17681EVKITD# be used for medical equipment power design?

Yes, the MAX17681EVKITD# is explicitly cited in Maxim's documentation for "Isolated Power Supplies in Medical Equipment" applications. Its transformer-isolated architecture, −40°C to +125°C operation, reinforced creepage/clearance enabled by the TDFN package and layout, and certified safety margins (e.g., 48V absolute max VIN) support Class II and BF-rated auxiliary supply development - provided final system-level isolation testing and regulatory certification are completed per IEC 60601-1 requirements.