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Eval module for LM34902/4 power switch

Posted: 16 Oct 2012 ?? ?Print Version ?Bookmark and Share

Keywords:system controller? overload protection? fault modes?

With the advent of new handset, tablet and notebook devices in smaller and smaller footprints, engineers are facing the challenge of designing next-generation systems that fit into these smaller form factors. Also, consumers are placing more value on the battery life of their portable devices by seeking longer operation time between charges. One of the standards that has become a "must have" for these devices is the USB port that enables a user to connect various accessories to their device. However, power transfer from a host device to a downstream accessory needs to be carefully managed to avoid inrush current and/or voltage transient events upon connection. The accessory typically sends a handshake signal to indicate that it is ready to accept downstream power transfer. Only then should the device's CPU or system controller authorize current flow. Well-defined overload protection is also mandated to reliably manage capacitive loads or accessory fault modes.

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Originally published by Texas Instruments at as "LM34902/4 Current Limited Power Switch Evaluation Module".

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