LTC4267IGN-1#PBF

LTC4267-1 is a 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. It 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. It includes an onboard error amplifier and voltage reference allowing use in both isolated and non-isolated configurations. It is used in applications such as IP phone power management, wireless access points, security cameras, power over ethernet.

• Onboard 100V, UVLO switch
• Precision dual level inrush current limit
• Integrated current mode switching regulator
• Programmable classification current (class 0-4)
• Thermal overload protection, power good signal
• Integrated error amplifier and voltage reference
• On-resistance is 1 ohm typ at (I = 300mA, VPORTN = -48V, measured from VPORTN to POUT)
• Soft-start time is 1.4ms typical at (PVCC – PGND = 8V, TA = 25°C)
• Operating temperature range from -40°C to 85°C
• Package style is 16-lead narrow plastic SSOP

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