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Load switches operate under 2.4V to 5.5V supply voltage range

Posted: 11 Aug 2005 ?? ?Print Version ?Bookmark and Share

Keywords:vishay intertechnology? load switch? switch? sip4610a? sip4610b?

A new protected high-side load switch that can operate under a supply voltage range of 2.4V to 5.5V and handle a continuous output current of 1A, with the threshold current set by a single external resistor was recently unveiled by Vishay Intertechnology Inc.

Both the SiP4610A and SiP4610B are designed for load switching, 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 low quiescent current of 9?A, and reduces the supply current to less than 1?A in shutdown mode.

In addition to the current limit, the SiP4610A/B is protected by undervoltage 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 165C and leaving it off until the temperature drops below 145C.

Providing the ability to selectively turn on and shut down various system functions, and to switch between power supply sources, 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 Pb-free 5-pin SC-70 and thin SOT-23 packages, both of the new products operate within the industrial temperature range of -40C to 85C. It provides circuit designers with a pin-for-pin replacement for the AAT4610A.

Samples and production quantities of the new power switches are already available, with lead times of six to eight weeks for larger orders.

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