Load switches with programmable current limits and OVP enhanced reliability

New Yorker Electronics offers four newly released Vishay eFuses that provide programmable current limits and OVP in the compact 3mm x 3mm TDFN package. Developed to function over a wide 2.8V to 23V input voltage range – with a 28 VIN DC tolerance – the 3.5A SiP32433A/B and the 6A SiP32434A/B integrate multiple control and protection features to facilitate designs and reduce the requirement for external components.

While many competing solutions only provide voltages to 18V, according to Vishay or are missing the low voltage side, the input voltage range of these single-channel load switches enables them to be employed in various designs. The devices are intended for industrial and medical equipment, consumer goods, home automation systems, robotics, and gaming consoles, where they offer precise control and swift fault responses to improve the safety and reliability of system designs. Upon 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.

All four devices react quickly to short circuits. Their precise OCP is triggered at a set current limit level with no excessive overhead current requirement – an important characteristic for designs where power busses need to support multiple loads. Competing solutions often require overhead currents of more than 30%.

The load switches lower on-resistance by 43% compared to previous-generation solutions, which translates into a 32% higher current capability or increased efficiency at the same current level. The 78mW SiP32433A/B has a current limit setting range of 0.3A to 3.5A, while the 33mW SiP32434A/B offers a range of 0.5A to 6A. These devices guarantee current limit accuracy down to ±8%, improve design flexibility, and simplify BOMs. The hot-swappable load switches provide 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 from -40C to +125C.