The LTC4263 is an autonomous single-channel PSE controller for use in IEEE 802.3af compliant Power over Ethernet systems. It includes an on-board power MOSFET, internal inrush, current limit, and short-circuit control, IEEE 802.3af compliant PD detection and classification circuitry, and selectable AC or DC disconnect sensing. On-board control algorithms provide complete IEEE 802.3af compliant operation without the need of a microcontroller. The LTC4263 simplifies PSE implementation, needing only a single 48V supply and a small number of passive support components. Programmable on-board 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 configured to automatically adjust to the detected PD class. Detection back-off timing is configurable for either Endpoint or Midspan operation. Built-in foldback and thermal protection provide comprehensive fault protection. An LED pin 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. Applications * IEEE 802.3af Compliant Endpoint/Midspan PSEs * Single-Port or Multi-Port Power Injectors * Power Forwarders * Low-Port Count PSEs * Environment B PSEs * Standalone PSEs * IEEE 802.3af Compliant * Operation from a Single 48V Supply * Fully Autonomous Operation without Microcontroller * Internal MOSFET with Thermal Protection * Power Management Works Across Multiple Ports with Simple RC Network * Precision Inrush Control with Internal Sense Resistor * Powered Device (PD) Detection and Classification * AC and DC Disconnect Sensing * Robust Short-Circuit Protection * Pin-Selectable Detection Back-off for Midspan PSEs * Classification Dependent ICUT Current Threshold * LED Driver Indicates Port On and Blinks Status Codes * Available in 14-Pin SO and 4mm × 3mm DFN Packages https://elecena.pl/product/261194/single-ieee-802-3af-compliant-pse-controller-with-internal-switch 2007-03-04 https://elecena.pl/product/261194/single-ieee-802-3af-compliant-pse-controller-with-internal-switch 2014-06-11 https://elecena.pl/product/261194/single-ieee-802-3af-compliant-pse-controller-with-internal-switch 2025-01-17