Offline buck converter targets IoT applications

Offline buck converter targets IoT applications

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By Nick Flaherty

The AL17050 has been developed to accept an AC input voltage between 85VAC and 265VAC, making it suitable for any region. The internal MOSFET is able to withstand voltages of up to 500V yet is optimized for low-power applications, meaning the device only consumes 100μA of static current. The device automatically adjusts to low loads for higher efficiency and with the wide AC input voltage range and fully integrated MOSFET, it provides a constant voltage for low-power applications that need to comply with strict standby power restrictions. 

The non-isolated design minimises the BoM for manufacturers developing applications for the IoT, such as smart appliances, smart sensors, and connected lighting. The AL17050 delivers a constant 3.3V/5V at up to 60mA for devices based on low power microcontrollers (MCUs) that integrate IoT connectivity such as Bluetooth LE or Zigbee. 

The AL17050 allows manufacturers to develop IoT applications that are powered directly from a high-voltage AC supply yet deliver outstanding power efficiency. With the number of devices in the IoT expected to rise to many billions in the next few years, energy efficiency is now a major design consideration. 

Alongside its excellent regulation and high-power efficiency, the AL17050 also integrates protection against over-temperature, over-load, output-short, and open-loop conditions. It is available in the SOT25 package and requires very few additional components in a buck converter configuration, making it suitable for small products where space is often limited. 

The AL17050 is priced at $0.125 each in 10K quantities.

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