MP8004 13W 802.3af PoE Powered Device Interface QFN-20

MP8004 13W 802.3af PoE Powered Device Interface QFN-20

The MP8004 is an integrated IEEE 802.3af PoE compliant Powered Device (PD) power supply solution.

Key Specifications

Features

• Meets IEEE 802.3af Specifications
• 100V, 1Ω Integrated Pass Switch
• 420mA DC Input Current Limit
• 150V, 0.45Ω Integrated Switch for Power Converter
• Cycle-by-Cycle Switching Current Limit
• Integrated 100V Start-Up Circuit
• Programmable Switching Frequency
• Duty Cycle Limiting with Line Feed Forward
• Internal Slope Compensation
• OCP, SCP, and OTP

Typical Application Circuit

Applications

• VoIP Telephones
• Security Camera Systems
• Wireless Access Points/Wireless LAN
• Small-Cell Base Stations
• Safety Backup Power

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