IC manufacturers (97)
- All manufacturers
Analog Devices
Infineon Technologies
Microchip
Onsemi
Renesas
ROHM
STMicroelectronics
Texas Instruments
- 3peak incorporated (16)
- Ablic (24)
- Advanced Power (4)
- Allegro Microsystems (84)
- Alpha & Omega Semiconductor (37)
- AnalogySemi (3)
- AnDAPT Inc (181)
- Anpec (13)
- AXElite (2)
- Backward (6)
- Broadcom (47)
- Cambridge GaN Devices (18)
- Chipanalog Micro (10)
- Cologne Chips (1)
- Convenient Power (1)
- Dialog Semiconductor (12)
- Diodes Incorporated (232)
- Divimath (8)
- Elmos AG (1)
- EPC (99)
- e-Peas Semiconductors (1)
- Eta Solutions Co. Ltd. (9)
- GaN Systems (7)
- GaNPower (3)
- Giantec (1)
- Gstek Wuxi (1)
- Helix Semiconductor (7)
- Ikanos (3)
- IKON (1)
- Indie Semiconductor (5)
- Innovision Semiconductor Inc (2)
- Intel (80)
- Inventchip Technology (3)
- ISSI (51)
- JoulWatt (20)
- KDPOF (3)
- Kinetic Technology (9)
- Lattice semiconductor Corporation (20)
- Littelfuse (1)
- M3 Technology (M3Tek) (7)
- Macnica (16)
- MaxLinear (178)
- MikroE (19)
- MindCet (2)
- Monolithic Power Systems (930)
- Navitas Semiconductor Inc (6)
- NewEdge Technologies, Inc. (1)
- Nexperia (34)
- Nisshinbo Micro Device Inc. (10)
- Novosense Micro (1)
- NXP (313)
- O2 Micro International Ltd (10)
- On Bright (7)
- Panasonic (2)
- PN Junction Semiconductor (2)
- Power Integrations (112)
- Powermat (1)
- Pulsiv (19)
- Qorvo (86)
- Realsil SuRealsil(tek) Microelectronics (1)
- Richtek (296)
- Sanken Electric Co., Ltd. (16)
- Sckipio (6)
- Semtech (90)
- SG-Micro (32)
- Silanna Semiconductor (8)
- Silergy Corporation (30)
- Silicon Laboratory Inc. (105)
- Silicontent Technology (59)
- Silvertel (53)
- Skycore Semiconductors (1)
- Skyworks (29)
- Southchip (8)
- Summit Wireless (1)
- Tagore Tech (4)
- Taiwan Semiconductor (1)
- TDK Corporation (1)
- Tempo Semiconductor (1)
- Torex (37)
- Toshiba (25)
- Transphorm (21)
- TransSIP (2)
- Union (21)
- uPI Semiconductor (2)
- Valens Semiconductor (18)
- Wolfspeed (8)
- Xilinx (22)
- XL Semiconductor (3)
- XYSemi (62)
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 | L (mm) | f (mm) | xPxC | Tab | EMI | Application System | H (mm) | Operation Force (g) | Electrical Life (Cycles) | Actuator Color | Vaporphase process | Data rate | Ports | PoE | Improved CMRR | Operating Temperature | VT (V (RMS)) | Mount | L (µH) | Pins (pcs) | Rows | Gender | Type | IR (A) | Packaging | Samples | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | 62000311121 | SPEC | – | 6 files | Active i| Production is active. Expected lifetime: >10 years. | 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 | Active i| Production is active. Expected lifetime: >10 years. | WA-SNSR Self-Retaining Spacer | 12.7 | 4.8 | – | – | – | – | – | – | – | – | – | – | – | – | – | -30 °C up to +85 °C | – | – | – | – | – | – | – | – | – | |
 | 7490220123 | SPEC | 9 files | Active i| Production is active. Expected lifetime: >10 years. | 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 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. | – | 7 files | Active i| Production is active. Expected lifetime: >10 years. | WR-MJ Modular Jack Horizontal Shielded Rear Grounding Post 8P8C Tab Down | – | – | 8P8C | Down | No | CAT 3 | – | – | – | – | – | – | 1x1 | – | – | -40 °C up to +85 °C | – | THT | – | – | – | – | Horizontal | 1.5 | Tray | |
 | 434123050816 | SPEC | – | 5 files | Active i| Production is active. Expected lifetime: >10 years. | 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 | Active i| Production is active. Expected lifetime: >10 years. | 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 | |
| 615008142621 | 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. | – |
| 434123050816 | SPEC | – |
| 60800213421 | SPEC | – |
| Samples |
|---|
| Order Code | Datasheet | Simulation | Downloads | Status | Product series | L (mm) | f (mm) | xPxC | Tab | EMI | Application System | H (mm) | Operation Force (g) | Electrical Life (Cycles) | Actuator Color | Vaporphase process | Data rate | Ports | PoE | Improved CMRR | Operating Temperature | VT (V (RMS)) | Mount | L (µH) | Pins (pcs) | Rows | Gender | Type | IR (A) | Packaging | Samples |
|---|
