Analog Devices Inc./Maxim Integrated MAX17682EVKITB#

Overview

MAX17682EVKITB# from Maxim Integrated is a fully assembled and tested evaluation kit for the MAX17682 isolated synchronous buck (iso-buck) DC-DC converter, delivering +24V at 400mA from a 17V–36V input. It demonstrates primary-side feedback regulation, 250kHz fixed-frequency operation, 96% peak efficiency, and includes overcurrent/overtemperature protection without optocoupler.

For engineers reviewing the MAX17682EVKITB# datasheet, MAX17682EVKITB# pinout, MAX17682EVKITB# application, or MAX17682EVKITB# equivalent, this kit enables rapid validation of isolated 24V power delivery in industrial control, programmable logic controllers, and fieldbus interface modules requiring compact, optocoupler-free isolation up to 10W.

Technical Context

The MAX17682EVKITB# implements the MAX17682's forced-PWM iso-buck topology, using primary-side sensing to regulate an isolated +24V output without secondary-side feedback components. It operates at a constant 250kHz switching frequency across full line (17V–36V) and load (40mA–400mA) ranges, with ±10% output voltage regulation referenced to GND0.

Key board-level features include EN/UVLO configuration via jumper J1, VPRI and RESETB test points for primary-side voltage monitoring and fault signaling, and a proven PCB layout supporting stable 10W isolated power delivery. The kit uses a 33µH primary inductor (Wurth 750343672), Schottky secondary diode (SMD1200PL-TP), and TL431AIYDT shunt regulator for auxiliary bias.

Key Specifications

Availability

MAX17682EVKITB# is available at Aetrix Electronics and suitable for industrial automation, programmable logic controller (PLC) I/O module development, and fieldbus interface design requiring stable component supply, fast prototyping cycles, and validated reference layouts for isolated DC-DC conversion.

Supply support for MAX17682EVKITB# 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 ICs for industrial, automotive, and communications applications.

The MAX17682EVKITB# belongs to Maxim's isolated power evaluation platform family, designed specifically to accelerate adoption of optocoupler-free, primary-side regulated isolated DC-DC converters in cost- and space-sensitive industrial systems.

FAQ

What is the purpose of the MAX17682EVKITB#?

The MAX17682EVKITB# is a fully assembled evaluation kit that demonstrates the performance of the MAX17682 isolated synchronous buck DC-DC converter. It delivers a regulated +24V, 400mA isolated output from a 17V–36V input using primary-side feedback. Engineers use the MAX17682EVKITB# to validate system-level behavior, verify layout practices, and characterize efficiency, transient response, and protection features before integrating the MAX17682 into end equipment.

Does the MAX17682EVKITB# require an external load to operate correctly?

Yes - the MAX17682EVKITB# requires a minimum load of approximately 40mA on the +24V rail to maintain regulation within ±10%. This is due to the iso-buck topology's need for a defined minimum current path; U2 (TL431AIYDT) provides this quiescent load when the output is healthy. Without it, output voltage may drift outside specification, especially at light loads or low input voltages.

How is enable and UVLO configured on the MAX17682EVKITB#?

The MAX17682EVKITB# uses jumper J1 to configure the EN/UVLO pin of the MAX17682. With J1 open (default), the pin connects to a resistor divider (R1/R2) setting UVLO turn-on at VIN ≥ 15V. Shorting pins 1–2 enables continuous operation; shorting pins 2–3 disables output. This allows flexible startup sequencing and brownout protection tuning during evaluation.

Can the MAX17682EVKITB# be used to evaluate other output voltages?

No - the MAX17682EVKITB# is factory-configured for a fixed +24V isolated output. While the underlying MAX17682 IC supports adjustable outputs via external resistors, the EVKITB# board has no provision for reprogramming VPRI or secondary feedback. Output voltage adjustment requires modifying the transformer turns ratio and primary-side compensation - not supported by the pre-assembled MAX17682EVKITB# layout.

What safety isolation rating does the MAX17682EVKITB# support?

The MAX17682EVKITB# itself does not carry a certified isolation rating; its isolation performance depends on the transformer (T1) and PCB creepage/clearance design. The board uses a Wurth 750343672 inductor with reinforced insulation rated for 500V RMS working voltage, and layout follows IPC-2221B Class B spacing. For certified isolation (e.g., 2500VAC), users must validate the full assembly per IEC 62368-1 or UL 62368-1 with their own testing and certification process.