Datasheet Linear Technology LTC4267CGN-1#PBF — Datenblatt

LTC4267-1
Power over Ethernet
IEEE 802.3af PD Interface with
Integrated Switching Regulator
Description Features Complete Power Interface Port for IEEE 802В®.3af
Powered Device (PD)
n Onboard 100V, UVLO Switch
n Precision Dual Level Inrush Current Limit
n Integrated Current Mode Switching Regulator
n Onboard 25k Signature Resistor with Disable
n Programmable Classification Current (Class 0-4)
n Thermal Overload Protectio Power Good Signal
n Integrated Error Amplifier and Voltage Reference
n Low Profile 16-Pin SSOP Package The LTCВ®4267-1 combines an IEEE 802.3af compliant
Powered Device (PD) interface with a current mode switching regulator, providing a complete power solution for PD
applications. The LTC4267-1 integrates the 25k signature
resistor, classification current source, thermal overload
protection, signature disable and power good signal along
with an undervoltage lockout optimized for use with the
IEEE-required diode bridge. The LTC4267-1 provides an
increased operational current limit, maximizing power
available for class 3 applications. n The current mode switching regulator is designed for
driving a 6V rated N-channel MOSFET and features programmable slope compensation, soft-start, and constant …