4.5V to 60V Input, High-Efficiency, Iso-Buck DC-DC Converter

The Rainier series of isolated DC-DC products enable small, efficient solutions with a lower BOM cost. The MAX17686 is a high-voltage, high-efficiency, iso-buck DC-DC converter designed to provide isolated power up to 5W. The device operates over a wide 4.5V to 60V input and uses primary-side feedback to regulate the output voltage.

The MAX17686 uses peak-current-mode control. The lowresistance, on-chip MOSFETs ensure high efficiency at full load while simplifying the PCB layout.

The device generates a well regulated primary side voltage which is then scaled by a suitable transformer turns ratio to derive isolated secondary output rails. The MAX17686 features robust overcurrent protection on both the primary and secondary side.

The MAX17686 is available in a compact 10-pin (3mm x 2mm) TDFN package. Simulation model and design automation are available in EE-Sim.

Applications

* Floating Power Supply Generation * Isolated Fieldbus Interfaces * Isolated Power Supplies in Medical Equipment * PLC I/O Modules * Smart Meters

* Reduces External Components and Total Cost

* No OptoCoupler

* Synchronous Primary Operation

* All-Ceramic Capacitors, Compact Layout

* Supports Numerous Isolated DC-DC Applications

* Wide 4.5V to 60V Input

* Delivers Up to 5W Output Power

* Reduces Power Dissipation

* Peak Efficiency > 90%

* 0.9µA (typ) Shutdown Current

* Operates Reliably in Adverse Industrial Environments

* Peak and Sink Current-Limit Protection

* Robust Secondary-Side Output Overcurrent Protection

* ±1.7% Feedback Accuracy

* Programmable EN/UVLO Threshold

* Adjustable Soft-Start

* Overtemperature Protection

* -40°C to +125°C Operation