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News
IEEE 802.3bt PD Controller Paves Path to Higher Power
2016-09-12 | ReturnThe LT4295 is a single-signature 802.3bt PD controller that integrates an isolated switching regulator controller, capable of synchronous operation in both high efficiency forward and no-opto flyback topologies with auxiliary power support. This high level of integration simplifies front end PD designs by reducing component count and board space, allowing the LT4295 to efficiently deliver power to PD loads using just one IC. Unlike traditional PD controllers that integrate the power MOSFET, the LT4295 controls an external MOSFET to significantly reduce overall PD heat dissipation and maximize power efficiency, particularly important at 802.3bt’s higher power levels. An external MOSFET architecture allows users to size the MOSFET to their application’s requirements; standard LT4295-based implementations routinely select 30mΩ RDS(ON) MOSFETs.
The LT4295 is offered in industrial and automotive grades, supporting operating temperature ranges from –40°C to 85°C and –40°C to 125°C, respectively. The LT4295 is priced starting at $2.75 each in 1,000-piece quantities and is available in production quantities. The LT4295 provides an upgrade path from Linear Technology’s existing PoE+ PD controllers, including the LT4276 or LT4275. To further maximize available power and reduce heat dissipation in PDs, use the LT4321 ideal diode bridge controller. For more information, visit www.linear.com/product/LT4295.
Summary of Features: LT4295
1. IEEE 802.3af/at/bt (Draft 2.0) Powered Device (PD) with Forward/Flyback Controller
2. External Hot Swap N-Channel MOSFET for Lowest Power Dissipation & Highest System Efficiency
3. Supports Up to 71W PDs
4. 5-Event Classification Sensing
5. Superior Surge Protection (100V Absolute Maximum)
6. Wide Junction Temperature Range (–40°C to 125°C)
7. >94% End-to-End Efficiency with LT4321 Ideal Bridge
8. No-Opto Flyback Operation
9. Auxiliary Power Support as Low as 9V
10. Available in 28-Lead 4mm x 5mm QFN Package
Pricing shown is for budgetary use only and may differ due to local duties, taxes, fees and exchange rates.
Source:http://www.linear.com/