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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 | Status | Product series | IRP,40K(A) | ISAT,10%(A) | ISAT,30%(A) | RDC(mΩ) | fres(MHz) | Material | RDC max.(mΩ) | LR(µH) | ISAT(A) | LSmin.(µH) | Version | VIN | VOut1(V) | IOut1(A) | L(µH) | n | VT(V (AC)) | Size | Mount | Vaux(V) | RDC 1(mΩ) | RDC 2(mΩ) | RDC 3(mΩ) | Samples | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | WE-HCI SMT Flat Wire High Current Inductor, 6.6 A, 2 A | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-HCI SMT Flat Wire High Current Inductor | Performance Rated Current6.6 A | Saturation Current @ 10%2 A | Saturation Current @ 30%6 A | DC Resistance21.5 mΩ | Self Resonant Frequency50 MHz | MaterialSuperflux | DC Resistance23.65 mΩ | Rated Inductance4.5 µH | – | – | VersionSMT | – | – | – | Inductance6.5 µH | – | – | Size7050 | MountSMT | – | – | – | – | ||||
| WE-HCI SMT Flat Wire High Current Inductor, 8.3 A, 2.2 A | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-HCI SMT Flat Wire High Current Inductor | Performance Rated Current8.3 A | Saturation Current @ 10%2.2 A | Saturation Current @ 30%6.5 A | DC Resistance14.5 mΩ | Self Resonant Frequency56 MHz | MaterialSuperflux | DC Resistance15.95 mΩ | Rated Inductance3.4 µH | – | – | VersionSMT | – | – | – | Inductance4.9 µH | – | – | Size7050 | MountSMT | – | – | – | – | ||||
 | WE-HCC SMT High Current Cube Inductor, 8.9 A, 9.3 A | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-HCC SMT High Current Cube Inductor | Performance Rated Current8.9 A | Saturation Current @ 10%9.3 A | Saturation Current @ 30%12.5 A | – | Self Resonant Frequency36 MHz | MaterialFerrite | DC Resistance15 mΩ | Rated Inductance2.8 µH | – | – | VersionSMT | – | – | – | Inductance8.2 µH | – | – | Size1090 | MountSMT | – | – | – | – | ||||
 | WE-PoE+ Power over Ethernet Plus Transformer, –, – | Simulation– | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-PoE+ Power over Ethernet Plus Transformer | – | – | – | – | – | – | – | – | Saturation Current3.5 A | Leakage Inductance [min.]0.47 µH | VersionCCM Flyback | Input Voltage 37 - 57 V (DC) | Output Voltage 112 V | Output Current 12.1 A | Inductance38 µH | Turns Ratio2:1:1.1 | Insulation Test Voltage1500 V (AC) | SizeEP13 | MountSMT | Auxiliary Voltage12.5 V | DC Resistance 185 mΩ | DC Resistance 225 mΩ | DC Resistance 3155 mΩ | |||
| WE-PoE+ Power over Ethernet Plus Transformer, –, – | Simulation– | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-PoE+ Power over Ethernet Plus Transformer | – | – | – | – | – | – | – | – | Saturation Current3.2 A | Leakage Inductance [min.]0.625 µH | VersionCCM Flyback | Input Voltage 37 - 57 V (DC) | Output Voltage 13.3 V | Output Current 17.5 A | Inductance38 µH | Turns Ratio6.67:1:4 | Insulation Test Voltage1500 V (AC) | SizeEP13 | MountSMT | Auxiliary Voltage12.7 V | DC Resistance 1100 mΩ | DC Resistance 23 mΩ | DC Resistance 3182 mΩ | |||
749022016 | 10/100/1000 Base-T SMT Transformer, –, – | Downloads– | Status Activei| Production is active. Expected lifetime: >10 years. | Product series 10/100/1000 Base-T SMT Transformer | – | – | – | – | – | – | – | – | – | – | – | – | – | – | Inductance350 µH | – | Insulation Test Voltage1500 V (AC) | – | MountSMT | – | – | – | – | |||
 | WE-PoE Power over Ethernet Transformer, –, – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-PoE Power over Ethernet Transformer | – | – | – | – | – | – | – | – | Saturation Current3 A | – | VersionFlyback | Input Voltage 40 - 57 V (DC) | Output Voltage 15 V | Output Current 14.6 A | Inductance37 µH | Turns Ratio4.5:1:2.5 | Insulation Test Voltage2400 V (AC) | SizeEP13 | MountSMT | Auxiliary Voltage12 V | DC Resistance 168 mΩ | DC Resistance 25 mΩ | DC Resistance 3123 mΩ | ||||
 | WE-PoE++ Power over Ethernet Plus Plus Transformer, –, – | Simulation– | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-PoE++ Power over Ethernet Plus Plus Transformer | – | – | – | – | – | – | – | – | – | – | VersionForward | Input Voltage 40 - 57 V (DC) | Output Voltage 15 V | Output Current 117 A | Inductance175 µH | Turns Ratio3.5:1:2.25 | Insulation Test Voltage2400 V (AC) | SizeEFD20 | MountSMT | Auxiliary Voltage10.75 V | DC Resistance 150 mΩ | DC Resistance 210 mΩ | DC Resistance 3188 mΩ | |||
 | WE-PoE Power over Ethernet Transformer, –, – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-PoE Power over Ethernet Transformer | – | – | – | – | – | – | – | – | Saturation Current1.8 A | – | VersionFlyback | Input Voltage 36 - 57 V (DC) | Output Voltage 15 V | Output Current 12.3 A | Inductance44 µH | Turns Ratio4:1:1:2.5 | Insulation Test Voltage2400 V (AC) | SizeEP7 | MountSMT | Auxiliary Voltage12 V | DC Resistance 1305 mΩ | DC Resistance 240 mΩ | DC Resistance 340 mΩ | ||||
| WE-PoE Power over Ethernet Transformer, –, – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-PoE Power over Ethernet Transformer | – | – | – | – | – | – | – | – | Saturation Current2.75 A | – | VersionFlyback | Input Voltage 40 - 57 V (DC) | Output Voltage 124 V | Output Current 11 A | Inductance37 µH | Turns Ratio1:1:0.56 | Insulation Test Voltage2400 V (AC) | SizeEP13 | MountSMT | Auxiliary Voltage12.5 V | DC Resistance 179 mΩ | DC Resistance 260 mΩ | DC Resistance 3116 mΩ | ||||
 | WE-PoE+ Power over Ethernet Plus Transformer, –, – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-PoE+ Power over Ethernet Plus Transformer | – | – | – | – | – | – | – | – | Saturation Current3.8 A | – | VersionFlyback | Input Voltage 48 - 57 V (DC) | Output Voltage 15 V | Output Current 17 A | Inductance26 µH | Turns Ratio4.5:1:2.5 | Insulation Test Voltage2400 V (AC) | SizeEP13 | MountSMT | Auxiliary Voltage12 V | DC Resistance 194 mΩ | DC Resistance 27 mΩ | DC Resistance 3233 mΩ | ||||
 | WE-PoE Power over Ethernet Transformer, –, – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-PoE Power over Ethernet Transformer | – | – | – | – | – | – | – | – | Saturation Current8.5 A | – | VersionFlyback | Input Voltage 9 - 57 V (DC) | Output Voltage 112 V | Output Current 12 A | Inductance9 µH | Turns Ratio1:1.12:1 | Insulation Test Voltage1500 V (AC) | SizeEFD20 | MountSMT | Auxiliary Voltage10 V | DC Resistance 112.5 mΩ | DC Resistance 214 mΩ | DC Resistance 3385 mΩ |