Analog Devices LTC9101-2

Description

The LTC9101-2 chipset is a 12/24-port power sourcing equipment (PSE) controller designed for use in IEEE 802.3bt Type 3 and 4 compliant Power over Ethernet (PoE) systems. The LTC9101-2/LTC9102 is designed to power compliant 802.3af, 802.3at, and 802.3bt PDs. The LTC9101-2/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 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. An advanced power management host software layer is available. PD detection uses a proprietary multipoint detection mechanism ensuring excellent immunity from false PD identification. Autoclass and 5-event physical classification are supported. The LTC9101-2/LTC9102 includes an I2C serial interface operable up to 1MHz. The LTC9101-2/LTC9102 is pin or I2C programmable to negotiate PD delivered power up to 71.3W.

Features

• Fully Compliant IEEE 802.3bt Type 3 and 4 PSE
• Up to 24 PSE Ports with Two Power Channels per Port
• +80V/–20V Tolerant Port-Facing Pins
• 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 Voltage and Current Monitoring
• 1MHz I2C Compatible Serial Control Interface
• Pin or I2C Programmable PD Power
• Available in a 24-Lead 4mm × 4mm (LTC9101-2) and 64-Lead 7mm × 11mm (LTC9102) QFN Packages

Typical applications

• PoE PSE Switches/Routers and Midspans

More information

• Datasheet
• IC product information