SI3462 Datasheet | Silicon Labs

Features - IEEE 802.3at TM pliant PSE - Short-circuit output fault - Autonomous operation requires no protection host processor interface - LED status signal (detect, - plete reference design power good, output fault) available, including Si3462 controller - UNH Interoperability Test Lab and schematic: report available - Low-cost BOM - Extended operating range - pact PCB footprint (- 40 to +85 °C) - Operates directly from a +50 V - 11-Pin Quad Flat No-Lead (QFN) isolated supply package - Supports up to 30 W maximum - Tiny 3x3 mm PCB footprint; output power (Class 4) Ro HS-pliant - Robust 3-point detection algorithm - No-classify modes force power eliminates false detection events after valid detection - IEEE-pliant disconnect - Eliminates 10 BOM - Inrush current control ponents Applications - IEEE 802.3at endpoints and midspans - Environment A and B PSEs - Embedded PSEs - Set-top boxes - FTTH media converters - Cable modem and DSL gateways Description The Si3462 is a single-port power management controller for IEEE 802.3atpliant Power Sourcing Equipment (PSE). The Si3462 can be powered from a 50 V input using a shunt regulator, or, to save power, it can be powered from 50 V and 3.3 V power supplies. The IEEE-required Powered Device (PD) detection feature uses a robust 3-point algorithm to avoid false detection events. The Si3462's reference design kit also provides full IEEE-pliant classification and PD disconnect. Intelligent protection circuitry includes input under-voltage lockout (UVLO), classification-based current limiting, and output short-circuit protection. The Si3462 is designed to operate pletely independently of host processor control. An LED status signal is provided to indicate the port status, including detection, power good, and output fault event information. The Si3462 is pin-programmable to support four available power levels, endpoint and mid-span applications, and auto-retry or restart after disconnect functions....