Synchronously-rectified DC-DC step-down converter claims unmatched power efficiency benefits

Synchronously-rectified DC-DC step-down converter claims unmatched power efficiency benefits

Technology News |
By eeNews Europe

By integrating two MOSFET switches and eliminating an external Schottky diode, the MAX17503 delivers higher power efficiency, operating 50% cooler than any other industrial high-voltage DC-DC converter.

The device operates from 4.5 V to 60 V and delivers up to 2.5 A output current. The MAX17503 saves up to 50% space and reduces component count by 75%.

Industrial equipment has been shrinking with no heatsinks or fans. System designers also struggle to secure enough design margins against input voltage transients to meet fail-safe standards. The MAX17503 provides the widest input operating voltage range, significantly reduces heat dissipation, and improves reliability. Designers with widely varying loads can use pulse-frequency modulation (PFM) for enhanced efficiency at light load currents. Specifically designed for
industrial control and automation applications, the MAX17503 is ideal for programmable logic controllers (PLCs), process variable transmitters (PVTs), computerized numerical control (CNC), and distributed I/O modules in industrial process control, motor control, power grid, and building automation applications.

The MAX17503 claims to be 50% cooler compared with prevalent asynchronous solutions.  The device’s 60 V operation extends design margin for harsh industrial systems, eliminating external protection circuitry.

The MAX17503 features internal compensation across the output voltage and 200 kHz to 2.2 MHz switching frequency range.  

"We have been able to incorporate a synchronous rectifier in a high voltage buck converter," explained Chris Neil, Senior Vice President of Maxim Integrated’s Industrial and Medical Solutions Group. "The MAX17503 is a 2.5 A internal switch high voltage step-down converter.  The device is more energy efficient than what is typically out there because it replaces the free-wheeling diode with a lower resistance FET so you don’t have as much efficiency loss across the diode as you would across a FET.  Doing this at high voltages has always been the trick and we have been able to do that with our processor and design techniques.  We can achieve efficiencies over 90 percent and that allows power supplies to run about 50 percent cooler".

“Synchronous rectification in switching regulators at high voltages and currents on a single chip requires advanced process technology and innovative IC design,” said Anil Telikepalli, Director of Business Management at Maxim Integrated. “As the first company to bring synchronous rectification to high-voltage applications, Maxim delivers unparalleled power efficiency and size advantage to industrial customers who can now leap frog their competition.”

Availability and Pricing

The MAX17503 synchronously-rectified DC-DC step-down converter is vailable in a 20-pin, 4 mm x 4 mm TQFN package and is specified over the -40 °C to +125 °C temperature range.  Pricing starts at $1.94 (1000-up).

Visit Maxim Integrated at

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