Analog DevicesLTC9101AUF-2A#PBFPower Over Ethernet - PoE Controllers
Power Over Ethernet PSE Controller 25.5W 24-Pin QFN EP
LTC9101-2A: 12-/24-/48-Port IEEE 802.3 at PoE PSE Controller
The LTC9101-2A/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) systems.
The LTC9101-2A/LTC9102 is designed to power compliant 802.3af and 802.3at PDs. The LTC9101-2A/LTC9102 chipset delivers lowest-in-industry heat dissipation using low RDS(ON) external MOSFETs and 0.1Ω sense resistance per power channel. A transformer-isolated communication protocol replaces expensive optocouplers 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 current/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.
Key Features and Benefits
- • Fully Compliant IEEE 802.3at Type 1 and 2 PSE
- • Up to 48 PSE Ports
- • Industry-Standard Register Map
- • +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
- • Continuous Per-Port Voltage and Current Monitoring
- • 1MHz I2C Compatible Serial Control Interface
- • Pin or I2C Programmable PD Power
- • Available in 24-Lead 4mm × 4mm (LTC9101‑2A) and 64-Lead 7mm × 11mm (LTC9102) QFN Packages
Applications
- • PoE PSE Switches/Routers and Midspans
Evaluation Board
The LTC9101-2A can be evaluated with either the EVAL-LTC9101-2 or DC3160A.
Block Diagrams and Tables
| Compliant | |
| EAR99 | |
| Active | |
| 8542.39.00.60 | |
| Automotive | No |
| PPAP | No |
| PSE Controller | |
| IEEE802.3af/IEEE802.3at/IEEE802.3bt | |
| 2.8 | |
| 25.5 | |
| 6.7 | |
| Yes | |
| -40 | |
| 85 | |
| Tube | |
| Mounting | Surface Mount |
| Package Height | 0.75(Max) |
| Package Width | 4 |
| Package Length | 4 |
| PCB changed | 24 |
| Standard Package Name | QFN |
| Supplier Package | QFN EP |
| 24 |
| EDA / CAD Models |
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