LTC4267IDHC#PBF

LINEAR TECHNOLOGY  LTC4267IDHC#PBF  芯片, 以太网供电, IEEE802.3AF, 供电设备接口, 16DFN

The 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.

.

Precision dual level inrush current limit

.

Integrated current mode switching regulator

.

Onboard 25k signature resistor with disable

.

Programmable classification current

.

Thermal overload protection

.

Power good signal

.

Integrated error amplifier and voltage reference