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Overview
| Topology | Forward Converter |
| Input voltage | 37-57 V |
| Switching frequency | 200-223 kHz |
| Output 1 | 5 V / 13 A |
| IC revision | A |
Description
The LT®4276 is a pin-for-pin compatible family of IEEE 802.3 and LTPoE++ Powered Device (PD) controllers. It includes an isolated switching regulator controller capable of synchronous operation in both forward and flyback topologies with auxiliary power support.The LT4276A employs the LTPoE++ classification scheme, receiving 38.7W, 52.7W, 70W or 90W of power at the PD RJ45 connector, and is backwards compatible with IEEE 802.3. The LT4276B is a fully 802.3at compliant, 25.5W Type 2 (PoE+) PD. The LT4276C is a fully 802.3af compliant, 13W Type 1 (PoE) PD.The LT4276 supports both forward and flyback power supply topologies, configurable for a wide range of PoE applications. The flyback topology supports No-Opto feedback. Auxiliary input voltage can be accurately sensed with just a resistor divider connected to the AUX pin.The LT4276 utilizes an external, low RDS(ON) N-channel MOSFET for the Hot Swap function, maximizing power delivery and efficiency, reducing heat dissipation, and easing the thermal design
Features
- IEEE802.3af/at and LTPoE++™ 90W Powered Device (PD) with Forward/Flyback Controller
- LT4276A Supports All of the Following Standards:
- LTPoE++ 38.7W, 52.7W, 70W and 90W
- IEEE 802.3at 25.5W Compliant
- IEEE 802.3af up to 13W Compliant
- LT4276B is IEEE 802.3at/af Compliant
- LT4276C is IEEE 802.3af Compliant
- Superior Surge Protection (100V Absolute Maximum)
- Wide Junction Temperature Range (–40°C to 125°C)
- Auxiliary Power Support as Low as 9V
- No Opto-Isolator Required for Flyback Operation
- External Hot Swap™ N-Channel MOSFET for Lowest Power Dissipation and Highest System Efficiency
94% End-to-End Efficiency with LT4321 Ideal Bridge
- Available in a 28-Lead 4mm × 5mm QFN Package
Typical applications
- Outdoor Security Camera Equipment
- High Temperature Applications
- High Power Wireless Data Systems, Commercial and Public Information Displays
More information
Products
| Order Code | Datasheet | Simulation | Downloads | Product series | IRP,40K (A) | ISAT,10% (A) | ISAT,30% (A) | RDC (mΩ) | fres (MHz) | Material | RDC max. (mΩ) | LR (µH) | ISAT (A) | Version | VIN | VOut1 (V) | IOut1 (A) | L (µH) | n | VT (V (AC)) | Size | LSmin. (µH) | Mount | Vaux (V) | RDC 1 (mΩ) | RDC 2 (mΩ) | RDC 3 (mΩ) | Samples | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | 744314650 | SPEC | 8 files | WE-HCI SMT Flat Wire High Current Inductor | 6.6 | 2 | 6 | 21.5 | 50 | Superflux | 23.65 | 4.5 | – | SMT | – | – | – | 6.5 | – | – | 7050 | – | SMT | – | – | – | – | ||
| 744314490 | SPEC | 8 files | WE-HCI SMT Flat Wire High Current Inductor | 8.3 | 2.2 | 6.5 | 14.5 | 56 | Superflux | 15.95 | 3.4 | – | SMT | – | – | – | 4.9 | – | – | 7050 | – | SMT | – | – | – | – | ||
 | 7443330820 | SPEC | 8 files | WE-HCC SMT High Current Cube Inductor | 8.9 | 9.3 | 12.5 | – | – | Ferrite | 15 | 2.8 | – | SMT | – | – | – | 8.2 | – | – | 1090 | – | – | – | – | – | – | ||
 | 750310742 | SPEC | – | 9 files | WE-PoE+ Power over Ethernet Plus Transformer | – | – | – | – | – | – | – | – | 3.5 | CCM Flyback | 37 - 57 V (DC) | 12 | 2.1 | 38 | 2:1:1.1 | 1500 | EP13 | 0.47 | SMT | 12.5 | 85 | 25 | 155 | |
| 750310743 | SPEC | – | 9 files | WE-PoE+ Power over Ethernet Plus Transformer | – | – | – | – | – | – | – | – | 3.2 | CCM Flyback | 37 - 57 V (DC) | 3.3 | 7.5 | 38 | 6.67:1:4 | 1500 | EP13 | 0.625 | SMT | 12.7 | 100 | 3 | 182 | |
 | 749022016 | SPEC | – | 10/100/1000 Base-T SMT Transformer | – | – | – | – | – | – | – | – | – | – | – | – | – | 350 | – | 1500 | – | – | SMT | – | – | – | – | ||
 | 750313082 | SPEC | 8 files | WE-PoE Power over Ethernet Transformer | – | – | – | – | – | – | – | – | 3 | Flyback | 40 - 57 V (DC) | 5 | 4.6 | 37 | 4.5:1:2.5 | 2400 | EP13 | – | SMT | 12 | 68 | 5 | 123 | ||
 | 750313095 | SPEC | – | 9 files | WE-PoE++ Power over Ethernet Plus Plus Transformer | – | – | – | – | – | – | – | – | – | Forward | 40 - 57 V (DC) | 5 | 17 | 175 | 3.5:1:2.25 | 2400 | EFD20 | – | SMT | 10.75 | 50 | 10 | 188 | |
 | 750313109 | SPEC | 8 files | WE-PoE Power over Ethernet Transformer | – | – | – | – | – | – | – | – | 1.8 | Flyback | 36 - 57 V (DC) | 5 | 2.3 | 44 | 4:1:1:2.5 | 2400 | EP7 | – | SMT | 12 | 305 | 40 | 40 | ||
| 750314782 | SPEC | 8 files | WE-PoE Power over Ethernet Transformer | – | – | – | – | – | – | – | – | 2.75 | Flyback | 40 - 57 V (DC) | 24 | 1 | 37 | 1:1:0.56 | 2400 | EP13 | – | SMT | 12.5 | 79 | 60 | 116 | ||
 | 750314783 | SPEC | 8 files | WE-PoE+ Power over Ethernet Plus Transformer | – | – | – | – | – | – | – | – | 3.8 | Flyback | 48 - 57 V (DC) | 5 | 7 | 26 | 4.5:1:2.5 | 2400 | EP13 | – | SMT | 12 | 94 | 7 | 233 | ||
 | 750315422 | SPEC | 7 files | WE-PoE Power over Ethernet Transformer | – | – | – | – | – | – | – | – | 8.5 | Flyback | 9 - 57 V (DC) | 12 | 2 | 9 | 1:1.12:1 | 1500 | EFD20 | – | SMT | 10 | 12.5 | 14 | 385 |
| Order Code | Datasheet | Simulation | |
|---|---|---|---|
| 744314650 | SPEC | |
| 744314490 | SPEC | |
| 7443330820 | SPEC | |
| 750310742 | SPEC | – |
| 750310743 | SPEC | – |
| 749022016 | SPEC | |
| 750313082 | SPEC | |
| 750313095 | SPEC | – |
| 750313109 | SPEC | |
| 750314782 | SPEC | |
| 750314783 | SPEC | |
| 750315422 | SPEC |
| Samples |
|---|
| Order Code | Datasheet | Simulation | Downloads | Product series | IRP,40K (A) | ISAT,10% (A) | ISAT,30% (A) | RDC (mΩ) | fres (MHz) | Material | RDC max. (mΩ) | LR (µH) | ISAT (A) | Version | VIN | VOut1 (V) | IOut1 (A) | L (µH) | n | VT (V (AC)) | Size | LSmin. (µH) | Mount | Vaux (V) | RDC 1 (mΩ) | RDC 2 (mΩ) | RDC 3 (mΩ) | Samples |
|---|