LTC4278 - IEEE 802.3at PD with Synchronous No-Opto Flyback Controller and 12V Aux Support

Features
  • 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
  • Superior EMI Performance
  • Robust 100V 0.7Ω (Typ) Integrated Hot Swap MOSFET
  • IEEE 802.3at 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
Typical Application
Applications
  • VoIP Phones with Advanced Display Options
  • Dual-Radio Wireless Access Points
  • PTZ Security Cameras
  • RFID Readers
  • Industrial Controls
Packaging
Order Information
Part NumberPackageTempPrice(1-99)Price (1k)*
LTC4278CDKD#PBF7x4 DFN-32C$3.71$2.60
LTC4278CDKD#TRPBF7x4 DFN-32C$2.66
LTC4278IDKD#PBF7x4 DFN-32I$4.46$3.12
LTC4278IDKD#TRPBF7x4 DFN-32I$3.18
Demo Boards
Part NumberDescriptionPrice
DC1561BLTC4278 IEEE802.3at PD Controller with 12V Aux, Vout = 5V, Iout = 4.5A$75.00
Datasheet
Reliability Data
Product Selector Card
Related Product
LTC4278 - IEEE 802.3at PD with Synchronous No-Opto Flyback Controller and 12V Aux Support
R535 Reliability Data
PoE PD Controllers
PoE+ for the Power Hungry
Power over Ethernet Solutions
LTC4278 Footprints and Symbols