Class 8 Power over Ethernet (PoE) Powered Devices

The Si34071 PoE Powered Device (PDs) combines an IEEE 802.3bt interface and a high efficiency DC DC controller into a single IC. Configurable for class 4 – class 8 power, the Si34071 simplifies high power PoE designs for wireless access points, small cells, security cameras, and smart lighting. It supports the key new features of the 802.3bt specification including short maintain power signature (MPS), autoclass, and power demotion. A UART port provides a simple interface for the system controller to enable/disable MPS pulse generation and determine the power granted by the PSE. The integrated DC DC controller supports flyback or forward topologies. The DC DC’s peak current mode control and variable switching frequencies improve efficiency and reduce EMI. Combined with easy to use EVBs, the Si34071 provides a complete solution for designing the new generation of PoE Powered Devices.

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Class 8 Power over Ethernet Common Specs

Fully IEEE compliant 802.3bt interface supports
- Class 4 – 8 4-pair power
- Short maintain power signature (MPS)
- Autoclass
Integrated DC DC converter supports flyback or forward topologies
- Peak current mode control
- Low-EMI slew rate control
- PWM switching frequency control

External hotswap and switching FETs improve thermals
Comprehensive protection circuitry
- Internal transient voltage suppressor
- Under voltage lockout
- Thermal shutdown protection
- Short circuit protection

Transformer winding efficiency enhancer
UART interface to system controller

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Jump Start Your PoE Powered Device Development

PoE Powered Device (PD) design involves achieving IEEE compatibility and creating an efficient, stable, and EMI compliant power supply. Our complete portfolio of evaluation boards (EVBs) offer complete PD designs ready to be incorporated into an end system. All of our PoE PD EVBs are EMI compliant and include an IEEE compatibility report, detailed power supply performance analysis, and schematics in the user's guide.

Class 5-8 EVBs

Class 2, 3 EVBs

Class 4 EVBs

Find the Right Class 8 90W Device Select Columns

Select Columns

Part Number	Description	IEEE Specification	Maximum Output Power (W)	Package Type	Package Size (mm)	Aux Transformer Winding Input	DC DC	Efficiency (%)	Switching Frequency Range (kHz)	Temperature Range (°C)
Si34071-GM Buy Sample Dev Kit	PoE PD IEEE 802.3bt (Type 3 & 4) Compliant Interface	802.3 bt Type 3 and 4	71	QFN32	5x5			90	100 500	-40 85

Si34071 Isolated 71 W, 12 V Class 8 Evaluation Kit

The Si34071 5 V Class 8 evaluation kit demonstrates a complete 71 W IEEE 802.3bt Power over Ethernet Powered Device system using our Si34071 PoE PD device. A single Si34071 manages the PoE interface and dc-dc conversion.