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
See related product
See related product
See related product
