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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 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | 615008142621 | SPEC | – | 8 files | Active i| Production is active. Expected lifetime: >10 years. | WR-MJ Cat 3 Modular Jacks – THT | – | 8P8C | Shielded | Down | No | CAT 3 | Tray | – | – | – | – | – | – | – | 1x1 | – | – | -40 °C up to +85 °C | – | THT | – | – | Horizontal | – | 1.5 | 120 | |
 | 434123050816 | SPEC | – | 5 files | Active i| Production is active. Expected lifetime: >10 years. | WS-TASV J-Bend SMT Tact Switch 6.0x3.5 mm | – | – | – | – | – | – | Tape and Reel | 5 | 160 | 50000 | Black | No | not specified | – | – | – | – | -40 °C up to +85 °C | – | – | – | – | – | – | 0.05 | – | |
 | 702935000 | SPEC | – | 3 files | Active i| Production is active. Expected lifetime: >10 years. | WA-SNSR Self-Retaining Spacer | 4.8 | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | -30 °C up to +85 °C | – | – | – | – | – | 12.7 | – | – | |
 | 60800213421 | SPEC | – | 3 files | Active i| Production is active. Expected lifetime: >10 years. | WR-PHD Jumper | – | – | – | – | – | – | Bag | – | – | – | – | – | – | – | – | – | – | -25 °C up to +105 °C | – | – | – | 2 | – | – | 3 | 200 | |
 | 62000311121 | SPEC | – | 7 files | Active i| Production is active. Expected lifetime: >10 years. | WR-PHD Pin Header | – | – | – | – | – | – | Bag | – | – | – | – | – | – | – | – | – | – | -40 °C up to +105 °C | – | THT | – | 3 | Straight | 6 | 2 | 200 | |
 | 7490220123 | SPEC | 10 files | Active i| Production is active. Expected lifetime: >10 years. | WE-LAN LAN Transformer | – | – | – | – | – | – | – | 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) | 18.04 | – | – |
| Order Code | Datasheet | Simulation | |
|---|---|---|---|
| 615008142621 | SPEC | – |
| 434123050816 | SPEC | – |
| 702935000 | SPEC | – |
| 60800213421 | SPEC | – |
| 62000311121 | SPEC | – |
| 7490220123 | SPEC |
| Samples |
|---|
| 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 |
|---|
