LTC4267IGN#PBF

The LTC4267IGN#PBF is an IEEE 802.3af® compliant Powered Device (PD) Interface with a current-mode switching regulator, providing a complete power solution for PD applications. The LTC4267 integrates the 25kR signature resistor, classification current source, thermal overload protection, signature disable and power good signal along with an under voltage lockout optimized for use with the IEEE required diode bridge. The precision dual level input current limit allows the LTC4267 to charge large load capacitors and interface with legacy PoE systems. The current-mode switching regulator is designed for driving a 6V rated N-channel MOSFET and features programmable slope compensation, soft-start and constant frequency operation, minimizing noise even with light loads. It includes an on board error amplifier and voltage reference allowing use in both isolated and non-isolated configurations.