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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 | Status | Produktserie | f(mm) | xPxC | Schirmung | Tab | EMI | Anwendungssystem | Verpackung | H(mm) | Betätigungskraft(g) | Elektrische Lebensdauer(Cycles) | Actuator-Farbe | Waschbar | Dampfphasenprozess | Datenrate | Ports | PoE | Improved CMRR | Betriebstemperatur | VT(V (RMS)) | Montageart | L(µH) | Pins | Typ | L(mm) | IR(A) | Arbeitsspannung(V (AC)) | Muster | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | WR-MJ Cat 3 Modular Jacks – THT, –, 8P8C | Simulation– | Downloads7 Dateien | Status Aktivi| Produktion ist aktiv. Erwartete Lebenszeit: >10 Jahre. | ProduktserieWR-MJ Cat 3 Modular Jacks – THT | – | Anzahl der Pins (xPxC)8P8C | Schirmunggeschirmt | Tab PositionUnten | EMI FingerNein | AnwendungssystemCAT 3 | VerpackungTray | – | – | – | – | – | – | – | Ports1x1 | – | – | Betriebstemperatur -40 °C up to +85 °C | – | MontageartTHT | – | – | TypHorizontal | – | Nennstrom1.5 A | Arbeitsspannung120 V (AC) | ||
 | WS-TASV J-Bend SMT Tact Switch 6.0x3.5 mm, –, – | Simulation– | Status Aktivi| Produktion ist aktiv. Erwartete Lebenszeit: >10 Jahre. | ProduktserieWS-TASV J-Bend SMT Tact Switch 6.0x3.5 mm | – | – | – | – | – | – | VerpackungTape and Reel | Höhe5 mm | Betätigungskraft160 g | Elektrische Lebensdauer50000 Cycles | Actuator farbeSchwarz | WaschbarNein | Dampfphasenprozessnicht spezifiziert | – | – | – | – | Betriebstemperatur -40 °C up to +85 °C | – | – | – | – | – | – | Nennstrom0.05 A | – | |||
 | WA-SNSR Self-Retaining Spacer, 4.8 mm, – | Simulation– | Status Aktivi| Produktion ist aktiv. Erwartete Lebenszeit: >10 Jahre. | ProduktserieWA-SNSR Self-Retaining Spacer | Bohrung in Blende4.8 mm | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | Betriebstemperatur -30 °C up to +85 °C | – | – | – | – | – | Länge12.7 mm | – | – | |||
 | WR-PHD Kurzschlussbrücken, –, – | Simulation– | Status Aktivi| Produktion ist aktiv. Erwartete Lebenszeit: >10 Jahre. | ProduktserieWR-PHD Kurzschlussbrücken | – | – | – | – | – | – | VerpackungBeutel | – | – | – | – | – | – | – | – | – | – | Betriebstemperatur -25 °C up to +105 °C | – | – | – | Pins2 | – | – | Nennstrom3 A | Arbeitsspannung200 V (AC) | |||
 | WR-PHD Stiftleisten, –, – | Simulation– | Status Aktivi| Produktion ist aktiv. Erwartete Lebenszeit: >10 Jahre. | ProduktserieWR-PHD Stiftleisten | – | – | – | – | – | – | VerpackungBeutel | – | – | – | – | – | – | – | – | – | – | Betriebstemperatur -40 °C up to +105 °C | – | MontageartTHT | – | Pins3 | TypGerade | Länge6 mm | Nennstrom2 A | Arbeitsspannung200 V (AC) | |||
 | WE-LAN LAN Übertrager, –, – | Status Aktivi| Produktion ist aktiv. Erwartete Lebenszeit: >10 Jahre. | ProduktserieWE-LAN LAN Übertrager | – | – | – | – | – | – | – | Höhe9.05 mm | – | – | – | – | – | Datenrate1000 Base-T | Ports1 | PoE4PPoE (bis zu 1500 mA) | Verbesserte Common Mode EntstörungNein | Betriebstemperatur -40 °C up to +105 °C | Prüfspannung1500 V (RMS) | MontageartSMT | Induktivität180 µH | Pins24 | Typ4PPoE (to 1400 mA) | Länge18.04 mm | – | – |