Si3474 Data Sheet Up to four 802.3bt or eight 802.3at Ethernet Port PoE PSE Con- KEY FEATURES trollers Octal-Port Power Sourcing Equipment The Si3474 is a fully programmable, 50 to 57 V power management controller for IEEE (PSE) controller 802.3af, 802.3at, and 802.3bt compliant Power Sourcing Equipment (PSE). Designed IEEE 802.3af, 802.3at, and 802.3bt for use in PSE endpoints (switches), the Si3474 integrates eight independent ports, compliant each with the IEEE-required powered device (PD) detection and classification function- 2 ality. When used in 802.3af/802.3at (two-pair power) mode each PSE port supports Autonomous or I C host interface one Ethernet connection, for a total of eight PoE Ethernet connections. 802.3bt opera- Emergency Shutdown support with port tion (four-pair power) uses two PSE ports per Ethernet connection, for a total of four priority control PoE Ethernet connections. Adds enhanced features for maximum design flexibility: In addition, the Si3474 features a fully-programmable architecture that enables pow- Per-port current and voltage monitoring ered device (PD) disconnect using dc-sense algorithms, a robust multipoint detection Multi-point detection algorithm, software configurable per-port current and voltage monitoring, and program- Programmable power MOSFET gate mable current limits to support the IEEE 802.3af, 802.3at, and 802.3bt standards. drive control Intelligent protection circuitry includes input undervoltage detection, output current limit, Configurable watchdog timer enables and short-circuit protection. The Si3474 operates autonomously or by host processor failsafe operation 2 control through a two wire, I C compatible serial interface. An interrupt pin is used to Maskable interrupt pin alert the host processor of various status and fault conditions. Comprehensive fault protection circuitry Applications includes: Power undervoltage lockout IEEE 802.3af, 802.3at, and 802.3bt Power Sourcing Equipment (PSE) Output current limit and short-circuit Power over Ethernet Switches protection IP Phone Systems Thermal overload detection Smartgrid Switches Extended operating temp range: 40 to Ruggedized and Industrial Switches +85 C 56-pin, 8 x 8 mm QFN package (RoHS- compliant) Skyworks Solutions, Inc. Phone 781 376-3000 Fax 781 376-3100 sales skyworksinc.com www.skyworksinc.com 1 Rev. 0.5 Skyworks Proprietary Information Products and Product Information are Subject to Change Without Notice December 3, 2021 1Si3474 Data Sheet Ordering Guide 1. Ordering Guide Table 1.1. Si3474 Ordering Guide Ordering Current Sense Product Revi- Package Temperature Range (Ambient) 1 2 Part Number sion Resistor 56-pin, 8 x 8 mm QFN Si3474A-A01-IM A01 255 m 40 to 85 C RoHS-compliant Si3474B-A01-IM A01 200 m 56-pin, 8 x 8 mm QFN 40 to 85 C RoHS-compliant Note: 1. Add an R to the end of the part number for tape and reel option (e.g., Si3474A or Si3474A-A01-IMR). 2. Options include industry-standard 255 m or more thermally efficient 200 m sense resistor. Skyworks Solutions, Inc. Phone 781 376-3000 Fax 781 376-3100 sales skyworksinc.com www.skyworksinc.com 2 Rev. 0.5 Skyworks Proprietary Information Products and Product Information are Subject to Change Without Notice December 3, 2021 2