Data Sheet

LTC9101-2A/LTC9102

12-/24-/48-Port IEEE 802.3 at PoE PSE Controller

Rev. 0

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FEATURES

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Fully Compliant IEEE 802.3at Type 1 and 2 PSE

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Up to 48 PSE Ports

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Industry-Standard Register Map

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+80V/–20V Tolerant Port-Facing Pins

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ECC-Protected eFlash and Data RAMs

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Low Power Path Dissipation per Channel

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100mΩ Sense Resistance

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30mΩ or Lower MOSFET RDS(ON)

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Chipset Provides Electrical Isolation

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Eliminates Optos and Isolated 3.3V Supply

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Very High Reliability Multipoint PD Detection

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Continuous Per-Port Voltage and Current Monitoring

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1MHz I2C Compatible Serial Control Interface

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Pin or I2C Programmable PD Power

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Available in 24-Lead 4mm × 4mm (LTC9101‑2A) and 64-Lead

7mm × 11mm (LTC9102) QFN Packages

APPLICATIONS

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PoE PSE Switches/Routers and Midspans

DESCRIPTION

The LTC

®9101-2A/LTC9102 chipset is a (up to) 48-port power

sourcing equipment (PSE) controller designed for use in IEEE

802.3at Type 1 and 2 compliant Power over Ethernet (PoE) sys-

tems. The LTC9101-2A/LTC9102 is designed to power compliant

802.3af and 802.3at PDs. The LTC9101-2A/LTC9102 chipset deliv-

ers lowest-in-industry heat dissipation using low RDS(ON) external

MOSFETs and 0.1Ω sense resistance per power channel. A trans-

former-isolated communication protocol replaces expensive opto-

couplers and a complex isolated 3.3V supply, resulting in significant

bill of materials (BOM) cost savings.

Advanced power management features include per-port 14‑bit cur-

rent/voltage monitoring, programmable current limits, and versatile

fast shutdown of preselected ports. PD detection uses a proprietary

multipoint detection mechanism, ensuring excellent immunity from

false PD identification. 1-event and 2-event physical classification

are supported. The LTC9101-2A/LTC9102 includes an I2C serial

interface operable up to 1MHz. The LTC9101-2A/LTC9102 is pin or

I2C programmable to negotiate PD-delivered power up to 25.5W.

TYPICAL APPLICATION

Figure 1. 802.3at 2-Pair Application, 1 Port Shown