• 简体中文
• English

LTC4263 - Single IEEE 802.3af Compliant PSE Controller with Internal Switch

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 classification 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 simplifies 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 configured to automatically adjust to the detected PD class. Detection backoff 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.

Features 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 Backoff 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 Typical Application

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 Packaging

Order Information

Demo Boards