Analog Devices LTC9101-1 | Demoboard DC3159A-B

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. Advanced power management features include per-port 14-bit current/power monitoring, programmable current/ 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 LTC9101-1/LTC9102/ LTC9103 includes an I2C serial interface operable up to 1MHz. The LTC9101-1/LTC9102/LTC9103 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
• 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 n Available in 24-Lead 4mm × 4mm (LTC9101-1) and a 64-Lead 7mm × 11mm (LTC9102/LTC9103) QFN Packages

Typical applications

• PoE PSE Switches/Routers and Midspans

More information

• Datasheet
• IC product information