Low-cost, complete power solution for powered devices includes 12V buck converter

The MAX5953A provides a simple and inexpensive, yet complete, nonisolated power solution for a powered device (PD) in a PoE system. The circuit provides the PD with detection and classification signatures in compliance with the IEEE 802.3af standard, plus programmable inrush-current control, an integrated power switch, a PWM controller, and integrated high- and low-side switches. The buck step-down converter is capable of >80 percent conversion efficiency while delivering 12V at 0.85A.

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