Power Electronics

Tiny Load Switch Offers Selectable Current Limit

Vishay Intertechnology’s SiP4610A/B protected high-side load switch can operate under a supply voltage range of 2.4 V to 5.5 V and handle a continuous output current of 1 A, with the threshold current set by a single external resistor. The SiP4610A/B is designed for applications including load switching, battery switching, USB peripheral ports, and other power management applications in notebook computers, PDAs, other portable 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 low 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 SiP4610A/B is protected by undervoltage lockout and thermal shutdown features. The overtemperature 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.

The SiP4610A has an active low enable input, while the SiP4610B has an active high enable input. Available in 5-pin SC-70 and thin SOT-23 packages, the SiP4610A/B operates within the industrial temperature range of -40°C to +85°C. It provides circuit designers with a pin-for-pin replacement for the AAT4610A.

Samples and production quantities of the new SiP4610A/B power switch are available now. Pricing in 1000-piece quantities starts at $0.40.

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