SI3459

Si3459 OCTAL IEEE 802.3AT POE PSE CONTROLLER Features  Octal-Port Power Sourcing  Maskable interrupt pin Equipment (PSE) controller  Comprehensive fault protection  IEEE 802.3at Type I and II circuitry includes: compliant Power undervoltage lockout  Port priority shutdown control Output current limit and short-  Adds enhanced features for circuit protection maximum design flexibility: Thermal overload detection Per-port current and voltage  Pin-programmable AUTO modes monitoring  Extended operating temp range: PoE+ support with programmable –40 to +85 °C current limits  56-pin QFN package Multi-point detection (RoHS-compliant) Programmable power MOSFET  On-chip dc-dc converter enables gate drive control single-rail power operation Configurable watchdog timer enables failsafe operation Applications  IEEE Power Sourcing Equipment  (PSE)   Power over Ethernet Switches  IP Phone Systems Smartgrid Switches Ruggedized and Industrial Switches Description The Si3459 is a fully-programmable, eight-port power management controller for IEEE 802.3 compliant Power Sourcing Equipment (PSE). Designed for use in PSE endpoint (switches), the Si3459 integrates eight independent ports, each with IEEE-required powered device (PD) detection and classification functionality. In addition, the Si3459 features a fully-programmable architecture that enables powered device (PD) disconnect using a dc sense algorithm, a robust multipoin...