LTC4267IGN#PBF

LTC4267 is an IEEE 802.3af compliant powered device (PD) interface with a current mode switching regulator, providing a complete power solution for PD applications. This device integrates the 25Kohm 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 precision dual level input current limit allows the device to charge large load capacitors and interface with legacy PoE systems. 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 is used in application such as IP phone power management, wireless access points, security cameras, power over Ethernet etc.

• On-board 100V, 400mA maximum 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
• Oscillator frequency is 200KHz typical at (VITH/RUN – PGND = 1.3V, PVCC – PGND = 8V)
• Operating ambient temperature is -40°C to 85°C
• Package style is 16-lead narrow plastic SSOP

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