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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 | Product series | L (mm) | f (mm) | xPxC | Application System | H (mm) | Operation Force (Value) (g) | Electrical Life (Cycles) | Actuator Color | Vaporphase process | Data rate | Ports | PoE | Improved CMRR | Operating Temperature | VT (V (RMS)) | Mount | L (µH) | Pins | Rows | Gender | Type | IR (A) | Packaging | Samples | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | 62000311121 | SPEC | – | 6 files | WR-PHD 2.00 mm THT Pin Header | 6 | – | – | – | – | – | – | – | – | – | – | – | – | -40 °C up to +105 °C | – | THT | – | 3 | Single | Pin Header | Straight | 2 | Bag | |
 | 702935000 | SPEC | – | 3 files | WA-SNSR Self-Retaining Spacer | 12.7 | 4.8 | – | – | – | – | – | – | – | – | – | – | – | -30 °C up to +85 °C | – | – | – | – | – | – | – | – | – | |
 | 7490220123 | SPEC PCN pendingDue to a pending PCN there will be a new datasheet revision issued for this order code soon. Please find the actual as well based on valid PCN date the new revision datasheet below. If you have further questions please get in contact with our sales staff. | 8 files | WE-LAN LAN Transformer | 18.04 | – | – | – | 9.05 | – | – | – | – | 1000 Base-T | 1 | 4PPoE (up to 1500 mA) | No | -40 °C up to +105 °C | 1500 | SMT | 180 | 24 | – | – | 4PPoE (to 1400 mA) | – | – | ||
 | 615008142621 | SPEC | – | 7 files | WR-MJ Modular Jack Horizontal Shielded Rear Grounding Post 8P8C Tab Down | – | – | 8P8C | CAT 3 | – | – | – | – | – | – | 1x1 | – | – | -40 °C up to +85 °C | – | THT | – | – | – | – | Horizontal | 1.5 | Tray | |
 | 434123050816 | SPEC | – | 5 files | WS-TASV J-Bend SMT Tact Switch 6.0x3.5 mm | – | – | – | – | 5 | 160 | 50000 | Black | not specified | – | – | – | – | -40 °C up to +85 °C | – | – | – | – | – | – | – | 0.05 | Tape and Reel | |
 | 60800213421 | SPEC | – | 3 files | WR-PHD 2.00 mm Jumper with Test Point | – | – | – | – | – | – | – | – | – | – | – | – | – | -25 °C up to +105 °C | – | – | – | 2 | – | Jumper | – | 3 | Bag |
| Order Code | Datasheet | Simulation | |
|---|---|---|---|
| 62000311121 | SPEC | – |
| 702935000 | SPEC | – |
| 7490220123 | SPEC PCN pendingDue to a pending PCN there will be a new datasheet revision issued for this order code soon. Please find the actual as well based on valid PCN date the new revision datasheet below. If you have further questions please get in contact with our sales staff. | |
| 615008142621 | SPEC | – |
| 434123050816 | SPEC | – |
| 60800213421 | SPEC | – |
| Samples |
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| Order Code | Datasheet | Simulation | Downloads | Product series | L (mm) | f (mm) | xPxC | Application System | H (mm) | Operation Force (Value) (g) | Electrical Life (Cycles) | Actuator Color | Vaporphase process | Data rate | Ports | PoE | Improved CMRR | Operating Temperature | VT (V (RMS)) | Mount | L (µH) | Pins | Rows | Gender | Type | IR (A) | Packaging | Samples |
|---|