Analog Devices LTC9102

Description

The LTC®9101-1/LTC9102/LTC9103 chipset 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. The LTC9101-1/LTC9102/LTC9103 is designed to power compliant 802.3af, 802.3at,and 802.3bt PDs. The LTC9101-1/LTC9102/LTC9103 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 complex isolated 3.3V supply, resulting in significant BOM cost savings.

Features

• Fully Compliant IEEE 802.3bt Type 3 and 4 PSE
• Fully Compliant IEEE 802.3at Type 2 PSE
• Software-Compatible with LTC4291-1/LTC4292
• Up to 48 PSE Ports with One Power Channel per Port
• Up to 24 PSE Ports with Two Power Channels per Port
• ECC-Protected eFlash and Data RAMs
• Low Power Path Dissipation per Channel
• 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
• Connection Check Distinguishes Single-Signature and Dual-Signature PDs
• Continuous Per-Port Power and Current Monitoring
• 1MHz I2C Compatible Serial Control Interface
• Pin or I2C Programmable PD Power
• Available in 24-Lead 4mm × 4mm (LTC9101‑1) anda 64-Lead 7mm × 11mm (LTC9102/LTC9103) QFNPackages

Typical applications

• PoE PSE Switches/Routers and Midspans

More information

• Datasheet
• IC product information