Microsemi – Integrated PoE power controller with MOSFET switch

The PD70201 from Microsemi is an integrated powered device interface and PWM controller for a DC-DC converter used in Power-over-Ethernet (PoE) applications. It complies with the IEEE802.3af and IEEE802.3at PoE industry standards.

The PD70201 can be used for IEEE802.3af/IEEE802.3at Type 1 applications, and in IEEE802.3at Type 2 applications. A single PD70201 can be used in four-pair applications which consume up to 47.7W.

This device implements a low-power mode to save power under light loads, such as when the powered device is in stand-by mode. The user can set the power level at which the PD70201 enters its low-power mode by means of a single resistor value.

• Integrated 0.6Ω isolating MOSFET switch with in- rush current limit
• Adjustable DC-DC switching frequency range: 100-500kHz
• Soft-start circuit to control the output- voltage rise time