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2.5A voltage regulator boasts 2.2MHz switching speed

14 Oct 2013  | Steve Taranovich

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Maxim Integrated recently launched a new high voltage regulator that is designed to reduce heat dissipation, improve reliability and reduce space by up to 50 per cent and component count by 75 per cent.

The MAX17503 high voltage regulator is a synchronously-rectified DC-DC step-down converter. By integrating two MOSFET switches and eliminating an external Schottky diode, Maxim claims that the regulator delivers higher power efficiency, operating 50 per cent 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 regulator also has up to a 2.2MHz switching speed that allows smaller external components.


Typical application circuit
Industrial equipment has been shrinking with devices that need no heat sinks or fans and this regulator has built-in compensation across the output voltage range that eliminates the need for external components.

System designers also struggle to secure enough design margins against input voltage transients to meet fail-safe standards. That's because the regulator provides, what the company claims is the widest input operating voltage range. It also significantly reduces heat dissipation, and improves reliability.

Versatile MODE feature with peak-current-mode control architecture
Designers with widely varying loads can use pulse-frequency modulation (PFM) for enhanced efficiency at light load currents. The device features a peak-current mode control architecture with a MODE feature that can be used to operate the regulator in pulse-width modulation (PWM), pulse-frequency modulation (PFM) or discontinuous-conduction mode (DCM) control schemes.

Specifically designed for industrial control and automation applications, the IC 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.

IEC standards
This regulator was designed to comply with IEC61131 standard for PLC power as well as transient voltage protection up to 60v per IEC60664-1

Evaluation kits
There is a 5V output voltage application kit (MAX17503EVKITB) and a 3.3V output voltage application kit (MAX17503EVKITA)

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