LTC4269 IEEE 802.3at PoE+ Controller with Aux Support

Analog Devices LTC4269 is an integrated powered device (PD) controller and switching regulator intended for high power IEEE 802.3at and 802.3af applications. The controller is targeted for high efficiency, single and multi-output applications from 10 W to 25 W. By supporting both 1-event and 2-event classifications, as defined by the IEEE, the LTC42691 can be used in a wide range of product configurations.

The LTC4269 synchronous, current mode, flyback controller generates multiple supply rails in a single conversion step providing for the highest system efficiency while maintaining tight regulation across all outputs. The controller includes patented no-opto feedback topology to provide full IEEE 802.3 isolation without the need of an optoisolator circuit. A true soft-start function allows graceful ramp-up of all output voltages.

All PD solutions from ADI include a shutdown pin to provide flexible auxiliary power options. The LTC4269 can accommodate adapter voltages from 18 V to 60 V and supports both PoE or aux dominance options. The LTC4269 is available in a 32-pin DFN package and is ideal for 802.11n, IP phones, and PTZ security cameras.