eFuses quartet are programmable with over-voltage protection
Four new eFuses by Vishay Siliconix have programmable current limits and over-voltage protection. The 3.5A SiP32433A/B and 6.0A SiP32434A/B are supplied in the compact 3.0 x 3.0mm TDFN package.
The SiP32433A / B and SiP32434A / B are designed to operate over a wide 2.8 to 23V input voltage range, with a 28V IN DC tolerance. They integrate multiple control and protection features to simplify designs and minimise the need for external components, said Vishay.
Unlike competing switches which only offer voltages to 18V, or are missing the low voltage side, the input voltage range of the Vishay Siliconix single-channel load switches allows them to be used in a wider range of designs, including industrial and medical equipment, robotics, consumer goods, home automation systems, and gaming consoles. They provide precise control and swift fault responses to enhance the safety and reliability of these system designs, added Vishay. At switch-off due to latchable faults in these applications, the SiP32433A and SiP32434A are designed to latch the power switch off, while the SiP32433B and SiP32434B will auto-retry after a settable period of time.
All four devices respond swiftly to short circuits, and precise over-current protection is triggered at a set current limit level without an excessive overhead current requirement, said Vishay. This is an important characteristic for designs in which power buses need to support multiple loads. According to the company, competitors’ devices often require overhead currents of more than 30 per cent. The SiP32433A and SiP32433B have active reverse blocking, suitable for applications featuring USB Type-C and multiple power source switching.
The load switches reduce on-resistance by 43 per cent compared to previous-generation solutions, which translates into a 32 per cent higher current capability or increased efficiency at the same current level. The 78 mOhm SiP32433A / B has a current limit setting range of 0.3 to 3.5A, while the 33mOhm SiP32434A / B offers a range of 0.5 to 6.0A. Both devices guarantee current limit accuracy down to ± eight per cent while simplifying bill of materials.
The hot-swappable load switches feature a programmable turn-on slew rate, provide ESD tolerance of 2kV (human body model) and 0.75kV (charged device model), and operate over a temperature range of -40 °C to +125 °C.
Samples and production quantities of the eFuses are available now, with lead times of 20 weeks.
