Features

• 30W PSE Output Power
• IEEE 802.3af Compatible
• Operation from a Single 56V Supply
• Fully Autonomous Operation Without a Microcontroller
• Internal MOSFET with Thermal Protection
• Precision Inrush Control with Internal Sense Resistor
• Forced Current PD Detection for Noise Immunity
• AC and DC Disconnect Sensing
• Legacy PD Detection
• Robust Short-Circuit Protection
• Pin-Selectable Detection Backoff for Midspan PSEs
• LED Driver Indicates Port On and Blinks Status Codes
• Available in a Miniature14-Pin 4mm × 3mm DFN Package

Typical Application

Description

The LTC4263-1 is a high power, single PSE controller for use in Power over Ethernet systems. The internal current limit and short-circuit protection are designed to provide up to 30W of PSE output power for power hungry PoE applications such as WAPs, security cameras and RFID readers.

The LTC4263-1 includes IEEE 802.3af compliant PD detection circuitry along with selectable AC and DC disconnect sensing, allowing seamless operation in conventional IEEE 802.3af systems as well as propriety, high power applications. The LTC4263-1 simplifi es PSE implementation, needing only a single supply and a small number of passive support components. Onboard control algorithms provide complete PSE functionality without the need of a microcontroller and built-in foldback and thermal shutdown provide comprehensive fault protection. An LED pin indicates the state of the port and detection backoff timing is confi gurable for either endpoint or midspan operation.

The LTC4263-1 is available in a miniature 14-pin 4mm × 3mm DFN package.