LTC4263 Datasheet | Linear Technology

Features n IEEE 802®.3af pliant n Operation from a Single 48V Supply n Fully Autonomous Operation without Microcontroller n Internal MOSFET with Thermal Protection n Power Management Works Across Multiple Ports with Simple RC Network n Precision Inrush Control with Internal Sense Resistor n Powered Device (PD) Detection and Classification n AC and DC Disconnect Sensing n Robust Short-Circuit Protection n Pin-Selectable Detection Backoff for Midspan PSEs n Classification Dependent ICUT Current Threshold n LED Driver Indicates Port On and Blinks Status Codes n Available in 14-Pin SO and 4mm × 3mm DFN Packages APPLICATIONS n IEEE 802.3af pliant Endpoint/Midspan PSEs n Single-Port or Multi-Port Power Injectors n Power Forwarders n Low-Port Count PSEs n Environment B PSEs n Standalone PSEs L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. Hot Swap and Thin SOT are trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Single IEEE 802.3af pliant PSE Controller with Internal Switch DESCRIPTION The LTC®4263 is an autonomous single-channel PSE controller for use in IEEE 802.3af pliant Power over Ethernet systems. It includes an onboard power MOSFET, internal inrush, current limit, and short-circuit control, IEEE 802.3af pliant PD detection and classification circuitry, and selectable AC or DC disconnect sensing. Onboard control algorithms provide plete IEEE 802.3af pliant 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 ponents. 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 configured to automatically adjust...