Linear Technology LTC4267IGN-1#PBF

Description
The LTC4267-1 combines an IEEE 802.3af compliant Powered Device (PD) interface with a current mode switching regulator, providing a complete power solution for PD applications. It 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.
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. The LTC4267-1 includes an onboard error amplifier and voltage reference allowing use in both isolated and nonisolated configurations.

Features
IEEE 802.3af PD Interface
Onboard 100V, UVLO Switch
Precision Dual Level Inrush Current Limit
Integrated Current Mode Switching Regulator
Onboard 25k Signature Resistor with Disable
Programmable Classification Current (Class 0-4)
Thermal Overload Protection
Power Good Signal
Integrated Error Amplifier and Voltage Reference
Low Profile 16-Pin SSOP Package

Applications
IP Phone Power Management
Wireless Access Points
Security Cameras
Power over Ethernet