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Overview
| Topology | Other Topology |
| IC revision | 1 |
Description
The LTC4279 is an autonomous single port power sourcing equipment (PSE) controller designed for use in IEEE 802.3at Type 1, Type 2 and LTPoE++ compliant Power over Ethernet (PoE) systems. The LTC4279 provides fully autonomous IEEE 802.3 and LTPoE++ compliant operation without a microcontroller. The LTC4279 simplifies PSE implementation, requiring only a single supply and a small number of passive support components.The LTC4279 delivers lowest-in-industry heat dissipation by utilizing a low-RDS(ON) external MOSFET and a 0.1Ω sense resistor, eliminating the need for expensive heat sinks and increasing efficiency.PD discovery uses a proprietary dual-mode 4-point detection mechanism ensuring excellent immunity from false PD detection. Midspan PSEs are supported with physical layer classification and a 2.5 second backoff timer.Legacy and custom PDs are supported with pin-selectable LEGACY and UltraPWR modes. LEGACY mode detects and powers pre-IEEE specification PDs. UltraPWR mode aggressively turns on and powers custom PDs requiring high inrush and/or operational currents.
Features
- Compliant with IEEE 802.3at Type 1 and 2
- Supports LTPoE++® Up to 90W
- Supports Dual-Signature PDs
- Fully Autonomous Operation without Microcontroller
- Very Low Power Dissipation
- 0.1Ω Sense Resistance
- Low RDS(ON) External MOSFET
- Very High Reliability 4-Point PD Detection
- 2-Point Forced Voltage and Forced Current
- Robust Short-Circuit Protection
- Cable Surge Protected ±80V OUT pin
- Classification Dependent ICUT and ILIM Current Thresholds
- Supports 2-Pair and 4-Pair Output Power
- UltraPWR Mode Supports Custom PDs up to 123W
- Pin-Selectable Detection Backoff Timer for Midspans
- Pin Programmable Legacy PD Detection
- Pin Programmable Maximum Power Mode
- Status LED Pin
- Available in 20-Pin QFN and 16-Pin SO Packages
Typical applications
- PoE PSE Endpoints (Switch/Router), PoE Midspan Power Injectors, Power Forwarders, Femto Cells, Security Systems
More information
Products
Order Code | Datasheet | Simulation | Downloads | Status | Product series | f(mm) | xPxC | Shielding | Tab | EMI | Application System | Packaging | H(mm) | Operation Force(g) | Electrical Life(Cycles) | Actuator Color | Washable | Vaporphase process | Data rate | Ports | PoE | Improved CMRR | Operating Temperature | VT(V (RMS)) | Mount | L(µH) | Pins | Type | L(mm) | IR(A) | Working Voltage(V (AC)) | Samples | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | WR-MJ Cat 3 Modular Jacks – THT, –, 8P8C | Simulation– | Downloads7 files | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWR-MJ Cat 3 Modular Jacks – THT | – | Number of Pins (xPxC)8P8C | ShieldingShielded | Tab PositionDown | EMI FingersNo | Application SystemCAT 3 | PackagingTray | – | – | – | – | – | – | – | Ports1x1 | – | – | Operating Temperature -40 °C up to +85 °C | – | MountTHT | – | – | TypeHorizontal | – | Rated Current1.5 A | Working Voltage120 V (AC) | ||
 | WS-TASV J-Bend SMT Tact Switch 6.0x3.5 mm, –, – | Simulation– | Downloads6 files | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWS-TASV J-Bend SMT Tact Switch 6.0x3.5 mm | – | – | – | – | – | – | PackagingTape and Reel | Height5 mm | Operation Force160 g | Electrical Life50000 Cycles | Actuator ColorBlack | WashableNo | Vaporphase processnot specified | – | – | – | – | Operating Temperature -40 °C up to +85 °C | – | – | – | – | – | – | Rated Current0.05 A | – | ||
 | WA-SNSR Self-Retaining Spacer, 4.8 mm, – | Simulation– | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWA-SNSR Self-Retaining Spacer | Drilling in Panel4.8 mm | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | Operating Temperature -30 °C up to +85 °C | – | – | – | – | – | Length12.7 mm | – | – | |||
 | WR-PHD Jumper, –, – | Simulation– | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWR-PHD Jumper | – | – | – | – | – | – | PackagingBag | – | – | – | – | – | – | – | – | – | – | Operating Temperature -25 °C up to +105 °C | – | – | – | Pins2 | – | – | Rated Current3 A | Working Voltage200 V (AC) | |||
 | WR-PHD Pin Header, –, – | Simulation– | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWR-PHD Pin Header | – | – | – | – | – | – | PackagingBag | – | – | – | – | – | – | – | – | – | – | Operating Temperature -40 °C up to +105 °C | – | MountTHT | – | Pins3 | TypeStraight | Length6 mm | Rated Current2 A | Working Voltage200 V (AC) | |||
 | WE-LAN LAN Transformer, –, – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-LAN LAN Transformer | – | – | – | – | – | – | – | Height9.05 mm | – | – | – | – | – | Data rate1000 Base-T | Ports1 | PoE4PPoE (up to 1500 mA) | Improved Common Mode RejectionNo | Operating Temperature -40 °C up to +105 °C | Insulation Test Voltage1500 V (RMS) | MountSMT | Inductance180 µH | Pins24 | Type4PPoE (to 1400 mA) | Length18.04 mm | – | – |