MP8017 1.5A IEEE 802.3af-Compliant PoE PD Solution QFN-19

MP8017 1.5A IEEE 802.3af-Compliant PoE PD Solution QFN-19

The MP8017 is an integrated, IEEE 802.3af- compliant, power over Ethernet (PoE) powered device (PD) with a flyback power converter.

Key Specifications

Features

• IEEE 802.3af-Compliant
• 100V, 0.5Ω Powered Device (PD) Input MOSFET
• Active-Clamp Primary-Side Regulation (PSR) Flyback without Auxiliary Winding
• Active-Clamp Secondary-Side Regulation (SSR) Flyback through Optocoupler
• 0.37Ω and 0.75Ω Integrated Flyback MOSFETs
• Configurable Frequency Up to 650kHz
• 1.5A Switching Current Limit
• Output Diode Compensation in PSR Mode
• Configurable Soft-Start Time
• EMI Reduction with Frequency Dithering

Typical Application Circuit

Applications

• IEEE 802.3af-Compliant Devices
• Security Cameras
• VoIP Phones
• Wireless Local Area Network (WLAN) Access Points)

Design Notes

• Rail sequencing order and delay are part of the SoC power-up contract; a wrong order latches the processor even though every rail is in spec.
• In multiphase designs, current balance depends on the loop matching between phases, so keep the layout symmetric.
• Digital interfaces (PMBus, I²C) need pull-ups to the correct rail and a defined state during power-up.
• Thermal design is a system problem here: the PMIC sits next to the load it feeds, so budget the shared copper, not the package alone.

Common Questions