LTC4278

RECOMMENDED FOR NEW DESIGNS

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

Data Sheet Product Selection Table

Part Models: 4
1ku List Price: Starting From $2.71

Viewing:

Part Details

25.5W IEEE 802.3at Compliant (Type 2) PD
10V to 57V Auxiliary Power Input
Shutdown Pin for Flexible Auxiliary Power Support
Integrated State-of-the-Art No-Opto Synchronous Flyback Controller

– Isolated Power Supply Efficiency >92%
– 88% Efficiency Including Diode Bridge and Hot Swap^™ FET

Superior EMI Performance
Robust 100V 0.7Ω (Typ) Integrated Hot Swap MOSFET
IEEE 802.3 at High Power Available Indicator
Integrated Signature Resistor and Programmable Class Current
Undervoltage, Overvoltage and Thermal Protection
Short-Circuit Protection with Auto-Restart
Programmable Soft-Start and Switching Frequency
Complementary Power Good Indicators
Thermally Enhanced 7mm × 4mm DFN Package

Part Models: 4
1ku List Price: Starting From $2.71

Documentation

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.

Part Model	Pin/Package Drawing	Documentation	CAD Symbols, Footprints, and 3D Models
LTC4278CDKD#PBF	32-Lead DFN (7mm x 4mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC4278CDKD#TRPBF	32-Lead DFN (7mm x 4mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC4278IDKD#PBF	32-Lead DFN (7mm x 4mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC4278IDKD#TRPBF	32-Lead DFN (7mm x 4mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys

This is the most up-to-date revision of the Data Sheet.

Hardware Ecosystem

Parts	Product Life Cycle	Description
Digital Temperature Sensors 1
LTC2991	RECOMMENDED FOR NEW DESIGNS	Octal I²C Voltage, Current, and Temperature Monitor
PoE Powered Device (PD) 1
LT4275	RECOMMENDED FOR NEW DESIGNS	LTPoE++/PoE+/PoE PD Controller
Power Monitors 1
LT2940	PRODUCTION	Power and Current Monitor

Tools & Simulations

LTspice 1

LTC4278 - Power-over-Ethernet (PoE) Interface Controllers

Models for the following parts are available in LTspice:

LTC4278

LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.