LTC4269-2

Features n 25.5W IEEE 802.3at Compliant (Type-2) PD n PoE+ 2-Event Classification n IEEE 802.3at High Power Available Indicator n Integrated State-of-the-Art Synchronous Forward Controller – Isolated Power Supply Efficiency >94% n Flexible Auxiliary Power Interface n Superior EMI Performance n Robust 100V 0.7Ω (Typ) Integrated Hot Swap™ MOSFET n Integrated Signature Resistor, Programmable Class Current, UVLO, OVLO and Thermal Protection n Short-Circuit Protection with Auto-Restart n Programmable Switching Frequency from 100kHz to 500kHz n Thermally Enhanced 7mm × 4mm DFN Package Applications n IP Phones with Large Color Screens n Dual Radio 802.11n Access Points n PTZ Security Cameras LTC4269-2 IEEE 802.3at High Power PD and Synchronous Forward Controller with AUX Support Description The LTC®4269-2 is an integrated Powered Device (PD) interface and power supply controller featuring 2-event classification signaling, flexible auxiliary power options, and a power supply controller suitable for synchronously rectified forward supplies. These features make the LTC4269-2 ideally suited for an IEEE802.3at PD application. The PD controller features a 100V MOSFET that isolates the power supply during detection and classification, and provides 100mA inrush current limit. Also included are power good outputs, an undervoltage/overvoltage lockout and thermal protection. The current mode forward controller allows for synchronous rectification, resulting in an extremely high efficiency, gr...