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Details
| Topologie | Sonstige Topologie |
| IC-Revision | 1 |
Beschreibung
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.
Eigenschaften
- 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
Typische Anwendungen
- PoE PSE Endpoints (Switch/Router), PoE Midspan Power Injectors, Power Forwarders, Femto Cells, Security Systems
Weiterführende Informationen
Artikeldaten
| Artikel Nr. | Datenblatt | Simulation | Downloads | Produktserie | L (mm) | f (mm) | xPxC | Anwendungssystem | H (mm) | Betätigungskraft (Value) (g) | Elektrische Lebensdauer (Cycles) | Actuator-Farbe | Dampfphasenprozess | Datenrate | Ports | PoE | Improved CMRR | Betriebstemperatur | VT (V (RMS)) | Montageart | L (µH) | Pins (Value) (pcs) | Reihen | Gender | Typ | IR (A) | Verpackung | Muster | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | 62000311121 | SPEC | – | 6 Dateien | WR-PHD 2.00 mm THT Pin Header | 6 | – | – | – | – | – | – | – | – | – | – | – | – | -40 °C up to +105 °C | – | THT | – | 3 | Single | Pin Header | Gerade | 2 | Beutel | |
 | 702935000 | SPEC | – | 3 Dateien | WA-SNSR Self-Retaining Spacer | 12.7 | 4.8 | – | – | – | – | – | – | – | – | – | – | – | -30 °C up to +85 °C | – | – | – | – | – | – | – | – | – | |
 | 7490220123 | SPEC | 8 Dateien | WE-LAN LAN Übertrager | 18.04 | – | – | – | 9.05 | – | – | – | – | 1000 Base-T | 1 | 4PPoE (bis zu 1500 mA) | Nein | -40 °C up to +105 °C | 1500 | SMT | 180 | 24 | – | – | 4PPoE (to 1400 mA) | – | – | ||
 | 615008142621 | SPEC | – | 7 Dateien | 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 | – | 4 Dateien | WS-TASV J-Bend SMT Tact Switch 6.0x3.5 mm | – | – | – | – | 5 | 160 | 50000 | Schwarz | nicht spezifiziert | – | – | – | – | -40 °C up to +85 °C | – | – | – | – | – | – | – | 0.05 | Tape and Reel | |
 | 60800213421 | SPEC | – | 3 Dateien | WR-PHD 2.00 mm Jumper with Test Point | – | – | – | – | – | – | – | – | – | – | – | – | – | -25 °C up to +105 °C | – | – | – | 2 | – | Jumper | – | 3 | Beutel |
| Artikel Nr. | Datenblatt | Simulation | |
|---|---|---|---|
| 62000311121 | SPEC | – |
| 702935000 | SPEC | – |
| 7490220123 | SPEC | |
| 615008142621 | SPEC | – |
| 434123050816 | SPEC | – |
| 60800213421 | SPEC | – |
| Muster |
|---|
| Artikel Nr. | Datenblatt | Simulation | Downloads | Produktserie | L (mm) | f (mm) | xPxC | Anwendungssystem | H (mm) | Betätigungskraft (Value) (g) | Elektrische Lebensdauer (Cycles) | Actuator-Farbe | Dampfphasenprozess | Datenrate | Ports | PoE | Improved CMRR | Betriebstemperatur | VT (V (RMS)) | Montageart | L (µH) | Pins (Value) (pcs) | Reihen | Gender | Typ | IR (A) | Verpackung | Muster |
|---|