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MP3921 IEEE 802.3af/at PSE Controller QFN-32
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pMPS MP3921 — IEEE 802.3af/at PSE Controller, QFN-32./p
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MP3921 IEEE 802.3af/at PSE Controller QFN-32
The MPS MP3921 is a IEEE 802.3af/at PSE Controller. It is supplied in a QFN-32 package.
The MP3921 is a single-port power-sourcing equipment (PSE) power controller for IEEE 802.3af/at-compliant power over Ethernet (PoE) applications.
Key Specifications
| Part Number | MP3921 |
| Function | IEEE 802.3af/at PSE Controller |
| Interface | I²C |
| Package | QFN-32 |
| Ordering Codes | MP3921 |
Features
- IEEE802.3af/at Compliant
- 0.25Ω Current-Sense Resistor (RSENSE)
- Automatic Mode and I2C Command Control Mode
- Internal VCC Power Supply
- Three-Wire I2C Interface for Isolated Applications
- Two INT Pins for Interrupt Priority Selection
- Disconnected DC Load Detection
- Instantaneous Current/Voltage Readout
- Configurable I2C Address
- Thermal Protection
Typical Application Circuit
Applications
- Power-Sourcing Equipment (PSE) Switches/Routers
- PSE Midspan Power Injectors
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
Which package and ordering codes apply to the MP3921?
QFN-32; order codes include MP3921.
What are the defining features of the MP3921?
IEEE802.3af/at Compliant 0.25Ω Current-Sense Resistor (RSENSE)
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