Topology | Forward Converter |
Input voltage | 37-57 V |
Switching frequency | 200-223 kHz |
Output 1 | 12 V / 7 A |
IC revision | A |
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.
94% End-to-End Efficiency with LT4321 Ideal Bridge
Order Code | Datasheet | Simulation | Downloads | Product series | L (µH) | VT (V (RMS)) | IRP,40K (A) | ISAT,10% (A) | ISAT,30% (A) | RDC (mΩ) | fres (MHz) | Material | Samples | |
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744314650 | SPEC | 8 files | WE-HCI SMT Flat Wire High Current Inductor | 6.5 | – | 6.6 | 2 | 6 | 21.5 | 50 | Superflux | |||
749022016 | SPEC | – | 10/100/1000 Base-T SMT Transformer | 350 | 1500 | – | – | – | – | – | – |
Samples |
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Order Code | Datasheet | Simulation | Downloads | Product series | L (µH) | VT (V (RMS)) | IRP,40K (A) | ISAT,10% (A) | ISAT,30% (A) | RDC (mΩ) | fres (MHz) | Material | Samples |
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