LTC4267-3 Datasheet | Linear Technology

Power over Ethernet IEEE 802.3af PD Interface with Integrated Switching Regulator Features Description nn plete Power Interface Port for IEEE 802®.3af Powered Device (PD) nn Onboard 100V, UVLO Switch nn Constant-Frequency 300k Hz Operation nn Precision Dual Level Inrush Current Limit nn Integrated Current Mode Switching Regulator nn Onboard 25k Signature Resistor with Disable nn Programmable Classification Current (Class 0-4) nn Thermal Overload Protection nn Power Good Signal nn Integrated Error Amplifier and Voltage Reference nn Low Profile 16-Pin SSOP or DFN Packages Applications nn IP Phone Power Management nn Wireless Access Points nn Security Cameras nn Power over Ethernet L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and LTPo E++ is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. The LTC®4267-3 bines an IEEE 802.3af pliant Powered Device (PD) interface with a 300k Hz current mode switching regulator, providing a plete power solution for PD applications. The LTC4267-3 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 LTC4267-3 provides an increased operational current limit, maximizing power available for class 3 applications. The 300k Hz current mode switching regulator provides higher output power or smaller external size pared to its lower frequency counterparts. The LTC4267-3 is designed for driving a 6V rated N-channel MOSFET and Features programmable slope pensation, soft-start, and constant-frequency operation, minimizing noise even with light loads. The LTC4267-3 includes an onboard error amplifier and voltage reference allowing use in both isolated and nonisolated configurations. The LTC4267-3 is available in a space saving, low profile 16-pin...