MP8020 Powered Device Interface QFN-18

MP8020 Powered Device Interface QFN-18

The MP8020 is an IEEE 802.3af/at/bt- compliant, Power over Ethernet (PoE), powered device (PD).

Key Specifications

Features

• Compliant with 802.3af/at/bt Specifications
• Internal Detection Resistor
• Supports Up to 71.3W Powered Device (PD) Operation
• Internal Hot-Swap MOSFET for ≤51W Design
• External MOSFET with GATE1 for >51W Design
• Auxiliary Power Supply from >8.8V Adapter
• GATE2 N-Channel MOSFET Driver for Adapter Supply
• Configurable Current Limit
• Automatic Maintain Power Signature
• PG and Allocated Power Type Indicators

Typical Application Circuit

Applications

• IEEE 802.3 af/at/bt-Compliant Devices
• Security Cameras
• Video and VoIP Phones
• WLAN Access Points
• Internet of Things (IoT) Devices

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