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LTC4278 Datasheet IEEE 802.3at PD

Manufacturer: Linear Technology (now Analog Devices)

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General Description

n 25.5W IEEE 802.3at Compliant (Type 2) PD n 10V to 57V Auxiliary Power Input n Shutdown Pin for Flexible Auxiliary Power Support n Integrated State-of-the-Art No-Opto Synchronous Flyback Controller – Isolated Power Supply Efficiency >92% – 88% Efficiency Including Diode Bridge and Hot Swap™ FET n Superior EMI Performance n Robust 100V 0.7Ω (Typ) Integrated Hot Swap MOSFET n IEEE 802.3at High Power Available Indicator n Integrated Signature Resistor and Programmable Class Current n Undervoltage, Overvoltage and Thermal Protection n Short-Circuit Protection with Auto-Restart n Programmable Soft-Start and Switching Frequency n Complementary Power Good Indicators n Thermally Enhanced 7mm × 4mm DFN Package APPLICATIONS n VoIP Phones with Advanced Display Options n Dual-Radio Wireless Access Points n PTZ Security Cameras n RFID Readers n Industrial

Overview

LTC4278.

Key Features

  • IEEE 802.3at PD with Synchronous No-Opto Flyback Controller and 12V Aux Support.

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