Si3473/72 Data Sheet Octal or Quad 2-pair 802.3bt Ethernet Port PoE PSE Controller KEY FEATURES The Si3473 and Si3472 are fully programmable, 50 V to 57 V power sourcing equip- ment (PSE) controllers for IEEE 802.3bt 2-pair, Type 3 applications. As 2-pair, Type Octal or Quad Port Power Sourcing 3 PSE controllers, Si3473/72 are compatible with IEEE 802.3af and IEEE 802.3at pow- Equipment (PSE) controller ered device (PD) loads. Designed for use in PSE endspans (switches) and midspans IEEE 802.3bt 2-pair, Type 3 compliant (injectors), the Si3473/72 integrates eight (Si3473) or four (Si3472) independent ports, IEEE 802.3af and IEEE 802.3at each with the IEEE-required detection and classification functionality. compatible 2 In addition, the Si3473/72 features include powered device (PD) disconnect using Autonomous or I C host interface dc-sense algorithms, a robust multipoint detection algorithm, software configurable Emergency Shutdown support with port per-port current and voltage monitoring, and programmable current limits to support priority control the IEEE 802.3af, 802.3at, and 2-pair 802.3bt standards. Intelligent power protection Adds enhanced features for maximum circuitry includes input undervoltage detection, output power limit, and short-circuit design flexibility: protection. The Si3473/72 operates autonomously or by host processor control through Per-port current and voltage monitoring 2 a two wire, I C-compatible serial interface. An interrupt pin is used to alert a host Multi-point detection processor of various status and fault events. Programmable power MOSFET gate drive control Applications Configurable watchdog timer enables IEEE 802.3af, 802.3at, and 2-pair 802.3bt Power Sourcing Equipment (PSE) failsafe operation Power over Ethernet Switches Maskable interrupt pin IP Phone Systems Comprehensive fault protection circuitry includes: Smartgrid Switches Power undervoltage lockout Ruggedized and Industrial Switches Output current limit and short-circuit Multiport PoE Injectors protection Applications powering IEEE Type 1 & 2 PDs through Class 4 up to 30 W Thermal overload detection Applications powering legacy 2-pair Class 5 PDs to 45 W Extended operating temp range: 40 to +85 C 38-pin 5 x 7 mm QFN package (Si3472) 56-pin, 8 x 8 mm QFN package (Si3473) 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 November 23, 2021 1Si3473/72 Data Sheet Ordering Guide 1. Ordering Guide Table 1.1. Si3473/72 Ordering Guide Ordering Current Sense Product Revi- Package Temperature Range (Ambient) 1 2 Part Number sion Resistor 56-pin, 8 x 8 mm QFN Si3473A-A01-IM A01 255 m 40 to 85 C RoHS-compliant Si3473B-A01-IM A01 200 m 56-pin, 8 x 8 mm QFN 40 to 85 C RoHS-compliant Si3472A-A01-IM A01 255 m 38-pin, 5 x 7 mm QFN 40 to 85 C RoHS-compliant Si3472B-A01-IM A01 200 m 38-pin, 5 x 7 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., Si3473/72A or Si3473/72A-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. 1.0 Skyworks Proprietary Information Products and Product Information are Subject to Change Without Notice November 23, 2021 2