Analog Devices LTC4279

Description

The LTC®4279 is an autonomous single port power sourcingequipment (PSE) controller designed for use in IEEE802.3at Type 1, Type 2 and LTPoE++ compliant Powerover Ethernet (PoE) systems. The LTC4279 provides fullyautonomous IEEE 802.3 and LTPoE++ compliant operationwithout a microcontroller. The LTC4279 simplifies PSEimplementation, requiring only a single supply and a smallnumber of passive support components.

Features

Compliant with IEEE 802.3at Type 1 and 2nn Supports LTPoE++® Up to 90Wnn Supports Dual-Signature PDsnn Fully Autonomous Operation without Microcontrollernn Very Low Power Dissipation– 0.1Ω Sense Resistance– Low RDS(ON) External MOSFETnn Very High Reliability 4-Point PD Detection– 2-Point Forced Voltage and Forced Currentnn Robust Short-Circuit Protectionnn Cable Surge Protected ±80V OUT pinnn Classification Dependent ICUT and ILIM CurrentThresholdsnn Supports 2-Pair and 4-Pair Output Powernn UltraPWR Mode Supports Custom PDs up to 123Wnn Pin-Selectable Detection Backoff Timer for Midspansnn Pin Programmable Legacy PD Detectionnn Pin Programmable Maximum Power Modenn Status LED Pinnn Available in 20-Pin QFN and 16-Pin SO Packages

Typical applications

• PoE PSE Endpoints, PoE Midspan Power Injectors
• Security Systems
• Power Forwarders
• Femto Cells

More information

• Datasheet
• IC product information