The recently released LTC4265 is a stand alone PD controller based on the latest PoE+ specification, IEEE 802.3at. Both the LTC4269 and LTC4265 are compatible with older “af” PSEs (also known as Type 1 hardware), and supports the new “at” specification with 2-event Hardware Classification. The classification current can be programmed using an external resistor to select the maximum power required while a convenient auxiliary input gives users the option to power the device using a battery or wall plug. HotSwap™ functionality is provided courtesy of a rugged 100V onboard MOSFET and complementary power good outputs provide interfacing to the “run” and “shutdown” of a DC/DC converter.