Si3400 Power over Ethernet PD Controller
The Si3400 is the industry’s most highly integrated, IEEE 802.3af compliant, PoE PD interface and pulse width modulated (PWM) switching regulator. By setting a new bar for device integration, lowest overall BOM cost, efficiency and reliability, the Si3400 enables designers to easily add PoE functionality to their Ethernet products.
The Si3400 and Si3401 are complete power supply solutions for Power over Ethernet (PoE) Powered Device (PD) applications.
When connected in a PoE-enabled system, such as a wireless access point or VoIP phone, the Si3400 converts the high voltage (typically ±48 V) supplied over Ethernet copper UTP cabling into a regulated, low voltage DC supply. In addition, the Si3400 combines all the required IEEE 802.3af detection, classification and hot swap interfaces with a complete, high efficiency, PWM switching regulator, including programmable soft start.
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