You can achieve greater efficiency across a wide industrial voltage range with the MAX17503 synchronously-rectified DC-DC step-down converter, the company asserts. The device, which is monolithic, integrates two MOSFET switches and eliminates an external Schottky diode; the MAX17503 delivers higher power efficiency, operating 50% cooler than any other industrial high-voltage DC-DC converter. It operates from 4.5V to 60V and delivers up to 2.5A output current. The MAX17503 saves up to 50% space and reduces component count by 75%.
Maxim notes that 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 suitable for programmable logic controllers (PLCs), process variable transmitters (PVTs), computerised numerical control (CNC), and distributed I/O modules in industrial process control, motor control, power grid, and building automation applications.
Internal compensation across the output voltage and 200 kHz to 2.2 MHz switching frequency range simplify the design task. The device comes in a 20-pin, 4 x 4 mm TQFN package, operates over -40°C to +125°C and costs $1.94 (1000).
Maxim Integrated; www.maximintegrated.com