LTC4271IUF#PBF

LTC4271 is an 8-port power sourcing equipment (PSE) controller designed for use in IEEE 802.3at type 1 and type 2 (high power) compliant Power over Ethernet (PoE) systems. Transformer-isolated communication protocol replaces expensive opto-couplers and complex isolated 3.3V supply resulting in significant BOM cost savings. This device chipset delivers lowest-in-industry heat dissipation by utilizing low-RDS(ON) external MOSFETs and 0.25 ohm sense resistors. Advanced power management features include per-port 12bit current monitoring ADCs, DAC-programmable current limit, and versatile fast shut-down of preselected ports. Advanced power management host software is available under a no-cost license. PD discovery uses a proprietary dual-mode 4-point detection mechanism ensuring excellent immunity from false PD detection. Midspan PSEs are supported with 2-event classification and a 2 second backoff timer. It is widely used in application like PoE PSE switches/routers, PoE PSE midspans.

• Reduced BOM cost, eliminates upto 6 high speed opto-couplers
• VEE and VPORT monitoring
• 1 second rolling IPORT averaging
• Supports 2-pair and 4-pair output power
• 1MHz I²C compatible serial control interface
• VDD supply voltage is 3.3V typical
• VDD supply current is 10mA typical
• Undervoltage lock-out is 2.7V typical at (VDD – DGND)
• Operating ambient temperature is -40°C to 85°C
• Package style is 24-lead plastic QFN

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