The LTC4268-1 is an integrated Powered Device (PD) controller and switching regulator intended for IEEE 802.3af and high power PoE applications up to 35W. By including a precision dual current limit, the LTC4268-1 keeps inrush below IEEE 802.3af current limit levels to ensure interoperability success while enabling high power applications with a 750mA operational current limit. The LTC4268-1 synchronous, current-mode, flyback controller generates multiple supply rails in a single conversion providing for the highest system efficiency while maintaining tight regulation across all outputs. The LTC4268-1 includes patented No-Opto feedback topology to provide full IEEE 802.3af isolation without the need of opto-isolator circuitry. The oversized power path and high performance flyback controller of the LTC4268-1 combine to make the ultimate solution for power hungry PoE applications such as WAPs, PTZ security cameras, RFID readers and ultra-efficient 802.3af applications running near the 12.95W limit. The LTC4268-1 is available in a space saving 32-pin DFN package. Applications * VoIP Phones with Advanced Display Options * Dual-Radio Wireless Access Points * PTZ Security Cameras * RFID Readers * Industrial Controls * Magnetic Card Readers * High Power PoE Systems * Robust 35W PD Front End * IEEE 802.3af Compliant * Rugged 750mA Power MOSFET with Precision Dual Level Current Limit * High Performance Synchronous Flyback Controller * IEEE Isolation Obtained Without an Opto-Isolator * Adjustable Frequency from 50kHz to 250kHz * Tight Multi-Output Regulation with Load Compensation * On-board 25k Signature Resistor * Programmable Classification Current to 75mA * Complete Thermal and Over-Current Protection * Available in Compact 32-Pin 7mm × 4mm DFN Package https://elecena.pl/product/513093/high-power-pd-with-synchronous-no-opto-flyback-controller 2007-08-17 https://elecena.pl/product/513093/high-power-pd-with-synchronous-no-opto-flyback-controller 2014-06-11 https://elecena.pl/product/513093/high-power-pd-with-synchronous-no-opto-flyback-controller 2025-01-19