Datasheet Linear Technology LTC4278IDKD#PBF — Datenblatt

LTC4278
IEEE 802.3at PD with
Synchronous No-Opto Flyback
Controller and 12V Aux Support
DESCRIPTION FEATURES n n n n n n n n n 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 0.7О© (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 Г— 4mm DFN Package The LTCВ®4278 is an integrated Powered Device (PD) controller and switching regulator intended for high power
IEEE 802.3at and 802.3af applications. With a wide input
voltage range, the LTC4278 is specifically designed to support PD applications that include a low-voltage auxiliary …