LTC4267-1 Datasheet | Linear Technology

Features Power over Ethernet IEEE 802.3af PD Interface with Integrated Switching Regulator Description n plete Power Interface Port for IEEE 802®.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 Protection n Power Good Signal n Integrated Error Amplifier and Voltage Reference n Low Profile 16-Pin SSOP Package Applications n IP Phone Power Management n Wireless Access Points n Security Cameras n 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®4267-1 bines an IEEE 802.3af pliant Powered Device (PD) interface with a current mode switching regulator, providing a plete 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. The current mode switching regulator 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 LTC4267-1 includes an onboard error amplifier and voltage reference allowing use in both isolated and nonisolated configurations. The LTC4267-1 is available in a space saving, low profile 16-pin SSOP package. Typical Application Class 2 PD with 3.3V Isolated Power Supply PA1133 SBM1040 - 48V FROM DATA PAIR + HD01 - - 48V FROM SPARE PAIR + HD01 - VPORTP PVCC SMAJ58A PWRGD...