Si34071 Data Sheet The Si34071 integrates the signaling, control, and power KEY FEATURES conversion functions required in a Power over Ethernet 802.3bt- Full IEEE 802.3bt compliance powered device (PD) application. Synchronous FET or Active clamp driver Peak current mode dc-dc converter The optimized architecture minimizes the solution footprint and external BOM while us- Tunable switching frequency ing standard, low cost components. The integrated PoE PD interface fully complies with the IEEE 802.3bt standard and uses external resistors to program the requested classi- Auxiliary transformer winding support fication and detection signatures. Connection to the PSE switch is maintained during Maintain-power-signature (MPS) support no-load condition by an optional maintain-power-signature (MPS) signal. An internal, UART interface to system controller current-mode controlled switching regulator converts the high voltage supplied over Autoclass support the 10/100/1000BASE-T Ethernet connection to a regulated, low-voltage output supply. 40 to +85 C temperature The switching regulator supports isolated flyback and forward converter topologies. An Compact ROHS-compliant 5 mm x 5 mm external resistor tunes the switching frequency. High efficiency features include a main QFN Package transformer bias winding input and a synchronous gate driver for secondary side FET control, or active clamp, depending on the topology. APPLICATIONS The Si34071 is available in a low-profile, 32-pin, 5 x 5 mm QFN package. Voice over IP telephones Wireless access points Security and surveillance IP cameras Lighting luminaires Point-of-sale terminals Internet appliances Network devices Skyworks Solutions, Inc. Phone 781 376-3000 Fax 781 376-3100 sales skyworksinc.com www.skyworksinc.com 1 Rev. 1.0 Skyworks Proprietary Information Products and Product Information are Subject to Change Without Notice July 26, 2021 1Si34071 Data Sheet Ordering Guide 1. Ordering Guide Table 1.1. Si34071 Ordering Guide 1 2 Temperature Range (Ambient) Applications Ordering Part Number Package 5 x 5 mm 32-QFN Si34071-A01-GM 40 to 85 C All Purposes Pb-free, RoHS-compliant 1. Add an R to the end of the part number for tape and reel option (e.g., Si34071-A01-GM or Si34071-A01-GMR). 2. Pin 1 is oriented in Quadrant 1 in the tape: 1 2 3 4 Quadrant Designations Skyworks Solutions, Inc. Phone 781 376-3000 Fax 781 376-3100 sales skyworksinc.com www.skyworksinc.com 2 Rev. 1.0 Skyworks Proprietary Information Products and Product Information are Subject to Change Without Notice July 26, 2021 2