LTC4263-1

NOT RECOMMENDED FOR NEW DESIGNS

High Power Single PSE Controller with Internal Switch

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Overview

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

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.

Applications