The LTC4269-2 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, green product. Soft-start for controlled output voltage start-up and fault recovery is included. Programmable frequency over 100kHz to 500kHz allows flexibility in efficiency vs size and low EMI. Applications * IP Phones with Large Color Screens * Dual Radio 802.11n Access Points * PTZ Security Cameras * 25.5W IEEE 802.3at Compliant (Type-2) PD * PoE+ 2-Event Classification * IEEE 802.3at High Power Available Indicator * Integrated State-of-the-Art Synchronous Forward Controller – Isolated Power Supply Efficiency >94% * Flexible Auxiliary Power Interface * Superior EMI Performance * Robust 100V 0.7Ω (Typ) Integrated Hot Swap™ MOSFET * Integrated Signature Resistor, Programmable Class Current, UVLO, OVLO and Thermal Protection * Short-Circuit Protection with Auto-Restart * Programmable Switching Frequency from 100kHz to 500kHz * Thermally Enhanced 7mm × 4mm DFN Package https://elecena.pl/product/858584/ieee-802-3at-high-power-pd-and-synchronous-forward-controller-with-aux-support 2009-06-10 https://elecena.pl/product/858584/ieee-802-3at-high-power-pd-and-synchronous-forward-controller-with-aux-support 2014-06-11 https://elecena.pl/product/858584/ieee-802-3at-high-power-pd-and-synchronous-forward-controller-with-aux-support 2025-01-20