MP8008 PD Interface QFN-28

MP8008 PD Interface QFN-28

The MP8008 is an integrated, IEEE, 802.3af/at, PoE-compliant, powered device (PD), power supply converter.

Key Specifications

Features

• Compatible with 802.3af/at Specifications
• 100V, 0.48Ω, PD Integrated Pass Switch
• 120mA PD Inrush Current
• 840mA PD Operation Current Limit
• Auxiliary Adapter O-Ring Power Supply
• PD Power Good and Type-2 PSE Indicator
• 12V, 1A, Flyback MOSFET Gate Driver
• Pulse-Skipping Operation in Light Load
• Programmable Switching Frequency: 30kHz - 400kHz
• Frequency Synchronizing from 80kHz - 400kHz

Typical Application Circuit

Applications

• IEEE 802.3af/at-Compliant Devices
• Security Cameras
• Video Telephones
• 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