FEATURES

? 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

? Very High Reliability Multipoint PD Detection

? Continuous Voltage, Temperature, and Current Monitoring

? 1MHz I2C Compatible Serial Control Interface

? Pin or I2C Programmable PD Power

? Available in a 24-Lead 4mm × 4mm (LTC9101-2B) and 64-Lead

7mm × 11mm (LTC9102) QFN Packages

APPLICATIONS

? PoE PSE Switches/Routers and Midspans

DESCRIPTION

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.