High-accuracy, adjustable, dynamic power limiters

December 23, 2014 // By Graham Prophet
Maxim has posted data sheets for a series of dynamic power limiters with thermal controlled current foldback, describing them as the first parts available with this combination of features

MAX14721–MAX14723 areadjustable overvoltage, undervoltage, and overcurrent protection devices that guard systems against overcurrent faults in addition to positive overvoltage and reverse-voltage faults. When used with an optional external p-channel MOSFET, the devices also protect downstream circuitry from voltage faults up to ±60V. The MAX14721–MAX14723 embody a 76-mΩ on-resistance integrated FET.

During startup, the devices are designed to charge large capacitances on the output in a continuous mode for applications where large reservoir capacitors are used on the inputs to downstream devices. The devices feature a dual-stage, current-limit mode in which the current is continuously limited to 1x, 1.5x, and 2x the programmed limit, respectively, for a short time after startup. This enables faster charging of large loads during startup.

MAX14721–MAX14723 also feature reverse-current and overtemperature protection. The devices are available in a 20-pin (5 x 5 mm) TQFN package and operate over a -40°C to 125°C temperature range; use them in control and automation, high-power applicationsl human /machine interfaces, industrial power systems and motion system drives.

Maxim Integrated; www.maximintegrated.com/en/products/interface/protection-and-isolation/MAX14721