·Compatible with 802.3af Specifications
·Support 13W PoE Power Application
·100V, 0.6Ω Integrated Pass Switch
·150mA DC Input Current Limit
·450mA PD Operation Current Limit
·Intelligent Maintain Power Signature (MPS)
·Integrated 160V Switching Power MOSFET
·Supports Primary-Side Regulated Flyback without Opto-Coupler Feedback
·Supports Low-side Switch Buck Converter
·3A Programmable Switching Current Limit
·OLP, OVP, OTP and Open-Circuit Protection
·Minimal External Components
·QFN4x5-28 Package
The TMI7321 is an integrated IEEE 802.3af PoE compliant Powered Device (PD) power supply solution. It includes a PD interface and an isolated/non-isolated fly-back or Buck converter. The PD interface includes detection and all the functions of IEEE 802.3af, classification, 150mA inrush current, 450mA operation current limit as well as 100V Hot-swap MOSFET. The DC/DC converter uses fixed peak current and variable frequency discontinuous conduction mode (DCM) to regulate constant output voltage. The primary-side regulation without opto-coupler feedback in fly-back mode simplifies the design while buck mode continues minimizes the solution size for non-isolated applications. A 160V integrated power MOSFET optimizes the device for various wide voltage applications It incorporates over current, open-circuit, and overvoltage protection and thermal shutdown. The TMI7321 supports a front-end solution for PoE-PD application with minimal external components and is available in QFN4x5-28 package.
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