LTC9101AUF-1#PBF

LTC9101-1 is a 48-port power sourcing equipment (PSE) controller designed for use in IEEE 802.3at type 2, 802.3bt type 3 and 4 compliant power over ethernet (PoE) systems. It is designed to power compliant 802.3af, 802.3at, and 802.3bt PDs. This device's chipset delivers lowest-in-industry heat dissipation by utilizing low-RDS(ON) external MOSFETs and 0.1 ohm sense resistance per power channel. A transformer-isolated communication protocol replaces expensive opto-couplers and complex isolated 3.3V supply, resulting in significant BOM cost savings. Advanced power management features include per-port 14-bit current/power monitoring, programmable current/ power limits, and versatile fast shut-down of preselected ports. An advanced power management host software layer is available. PD detection uses a proprietary multipoint detection mechanism ensuring excellent immunity from false PD identification. It is used in applications such as PoE PSE switches/routers and midspans etc.

• Upto 48 PSE ports with one power channel per port
• Upto 24 PSE ports with two power channels per port
• ECC-protected eflash and data RAMs
• 100Mohm sense resistance, 30Mohm or lower MOSFET RDS(ON)
• Chipset provides electrical isolation, eliminates optos and isolated 3.3V supply
• Very high reliability multipoint PD detection, continuous per-port power and current monitoring
• Connection check distinguishes single signature and dual-signature PDs
• 1MHz I²C compatible serial control interface, pin or I²C programmable PD power
• Undervoltage lock-out is 2.8V typ at (TA = 25°C)
• Operating temperature range from -40°C to 85°C, package style is 24-lead plastic QFN

บันทึก

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