LTC4263

The LTC4263 is an autonomous single-channel PSE controller for use in IEEE 802.3af compliant Power over Ethernet systems. It includes an onboard power MOSFET, internal inrush, current limit, and short-circuit control,
IEEE 802.3af compliant PD detection and classifi cation circuitry, and selectable AC or DC disconnect sensing. Onboard control algorithms provide complete IEEE 802.3af compliant operation without the need of a microcontroller. The LTC4263 simplifi es PSE implementation, needing only a single 48V supply and a small number of passive support components.

Programmable onboard power management circuitry permits multiple LTC4263s to allocate and share power in multi-port systems, allowing maximum utilization of the 48V power supply-all without the intervention of a host processor. The port current limit can be confi gured to automatically adjust to the detected PD class. Detection backoff timing of LTC4263 is confi gurable for either Endpoint or Midspan operation. Built-in foldback and thermal protection provide comprehensive fault protection.

An LED pin of LTC4263 indicates the state of the port controlled by the LTC4263. When run from a single 48V supply, the LED pin can operate as a simple switching current source to reduce power dissipation in the LED drive circuitry.

The LTC4263 is available in 14-pin 4mm * 3mm DFN and 14-pin SO packages.