Vishay Intertechnology recently released a protected high-side load switch that can operate under a supply voltage range of 2.4 to 5.5 V and handle a continuous 1-A output current, with the threshold current set by a single external resistor. The SiP4610A/B is designed for applications including load and battery switching, USB peripheral ports, and other power-management applications in notebook computers, PDAs, MP3 players, and other portable and handheld systems, as well as for hot-swapping in telecom applications.
A user-defined current-limit level protects the input supply voltage from excessive load currents that might cause a system failure. The SiP4610A/B has a quiescent current of 9 ΜA, and reduces the supply current to less than 1 ΜA in shutdown mode. In addition to the current limit, the part is protected by under-voltage lockout and thermal shutdown features. The over-temperature protection circuit prevents thermal runaway by turning off the power switch when the chip's junction temperature reaches +165°C, and leaving it off until the temperature drops below +145°C.
There are two versions of the power switch: the SiP4610A has an active low enable input, while the SiP4610B has an active high enable input. Available in lead-free, 5-pin SC-70 and thin SOT-23 packages, the SiP4610A/B operates within the industrial temperature range. Prices start at $0.40 in 1000-piece quantities. Vishay can be found on the Internet at www.vishay.com.