Features and Benefits
- Four PSE Ports
- Two Power Channels per Port
- Low Power Path Dissipation per Channel
- 150mΩ 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
- Fully Compliant IEEE 802.3bt Type 3 and 4 PSE
- Compliant Support for Type 1, 2, 3, and 4 PDs
- Continuous, Dedicated Per-Port Power and Current Monitoring
- Per-Port Power Policing
- 1MHz I2C Compatible Serial Control Interface
- Pin or I2C Programmable PD Power Up to 71.3W
- Available in a 40-Lead 6mm × 6mm (LTC4292) and 24-Lead 4mm × 4mm (LTC4291-1) QFN Packages
The LTC4291-1 / LTC4292 chipset is a 4-port power sourcing equipment (PSE) controller designed for use in IEEE 802.3bt Type 3 and 4 compliant Power over Ethernet (PoE) systems. The LTC4291-1 / LTC4292 is designed to power compliant 802.3af, 802.3at, and 802.3bt PDs. The LTC4291-1 / LTC4292 chipset delivers lowest-in-industry heat dissipation by utilizing low RDS(ON) external MOSFETs and 0.15Ω 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 monitoring, programmable current limit, and versatile fast shutdown of preselected ports. Advanced power management host software is available under a no-cost license. PD detection uses a proprietary multipoint detection mechanism ensuring excellent immunity from false PD identification. Autoclass and 5-event physical classification are supported. The LTC4291-1 / LTC4292 includes an I2C serial interface operable up to 1MHz. The LTC4291-1/LTC4292 is pin or I2C programmable to negotiate PD delivered power up to 71.3W.
Product Lifecycle Recommended for New Designs
This product has been released to the market. The data sheet contains all final specifications and operating conditions. For new designs, ADI recommends utilization of these products.
Evaluation Kits (2)
Demonstration circuit 2685B-KIT is an Ethernet Alliance Gen 2 PoE certified 4-port IEEE 802.3bt power sourcing equipment (PSE) composed of a DC2684A-B (daughter card) and DC2683A (motherboard). The DC2685BKIT is used for evaluation of the LTC4291-1/LTC4292 PSE chipset. Up to four IEEE 802.3af, IEEE 802.3at, or IEEE 802.3bt powered devices (PDs) can be connected and powered from this system using a single power supply. A DC590 is connected to the DC2685B-KITfor I2C interfacing with QuikEval™.
This demonstration manual provides a quick start procedure, a DC2684A-B daughter card overview, a DC2683A mother board overview, schematics, and layout printouts.
Software & Systems Requirements
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