Single PoE+PSE Controller - Linear Technology
Description
LTC4274 Single PoE+ PSE Controller
Features
nn Compliant with IEEE 802.
3at Type 1 and 2 nn 0.
34Ω Total Channel Resistance
nn 130mW/Port at 600mA nn Advanced Power Management
nn 8-Bit Programmable Current Limit (ILIM) nn 7-Bit Programmable Overload Currents (ICUT) nn Fast Shutdown nn 14.
5-Bit Port Current/Voltage Monitoring nn 2-Event Classification nn Very High Reliability 4-Point PD Detection nn 2-Point Forced Voltage nn 2-Point Forced Current nn High Capacitance Legacy Device Detection nn LTC4259A-1 and LTC4266 SW Compatible nn 1MHz I2C Compatible Serial Control Interface nn Midspan Backoff Timer nn Supports Proprietary Power Levels Above 25W nn Available in 38-Pin 5mm × 7mm QFN Package
Applications
nn PSE Switches/Routers nn PSE Midspans
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and ThinSOT and LTPoE++ are trademarks of Analog Devices, Inc.
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Description
The LTC®4274 is a single power sourcing equipment controller designed for use in IEEE 802.
3 Type 1 and Type 2 (high power) compliant Power over Ethernet systems.
External power MOSFETs enhance system reliability and minimize channel resistance, cutting power dissipation and eliminating the need for heatsinks even at Type 2 power levels.
External power components also allow use at very high power levels while remaining otherwise compatible with the IEEE standard.
80V-rated port pins provide robust protection against external faults.
The LTC4274 includes advanced power management features, including current and voltage readback and programmable ICUT and ILIM thresholds.
Available C libraries simplify software development; an optional AUTO pin mode provides fully IEEE-compliant standalone operation with no software required.
Proprietary 4-point PD detection circuitry minimizes false PD detection while supporting legacy phone operation.
Midspan operation is supported with built-in 2-event classification and backof...
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