12/24/48-Port IEEE 802.3bt 2-pair PoE PSE Digital Controller

The LTC®9101-2B/LTC9102 chipset is a 12-/24-/48-port power sourcing equipment (PSE) controller designed for use in IEEE 802.3bt-compliant Type 3 2-pair Power over Ethernet (PoE) systems. The LTC9101-2B/LTC9102 is designed to power compliant 802.3af, 802.3at, and 802.3bt PDs. The LTC9101-2B/LTC9102 chipset delivers lowest-in-industry heat dissipation by utilizing low RDS(ON) external MOSFETs and 0.1Ω sense resistance per power channel. A transformer-isolated communication protocol replaces expensive opto-couplers and a complex isolated 3.3V supply, resulting in significant BOM cost savings.

Advanced power management features include per-port 14‑bit current/ voltage monitoring, programmable power limits, and versatile fast shut down of preselected ports. PD detection uses a proprietary multipoint detection mechanism ensuring excellent immunity from false PD identification. Autoclass and 2-event physical classification are supported. The LTC9101-2B/LTC9102 includes an I2C serial interface operable up to 1MHz. The LTC9101-2B/LTC9102 is pin or I2C programmable to negotiate PD delivered power up to 25.5W.

APPLICATIONS

* PoE PSE Switches/Routers and Midspans

* Fully Compliant IEEE 802.3bt Type 3 2-Pair PSE

* Up to 48 PSE Ports with One Power Channel per Port

* +80V/–20V Tolerant Port-Facing Pins

* ECC-Protected eFlash and Data RAMs

* Industry-Leading Power Path Efficiency

* 100mΩ Sense Resistance

* 30mΩ or Lower MOSFET RDS(ON)

* Chipset Provides Electrical Isolation

* Eliminates Optos and Isolated 3.3V Supply