Silicon Labs SI3460-E02-GMR

Description
The Si3460 is a single-port, -48 V power management controller for IEEE 802.3af-compliant Power Sourcing Equipment (PSE). Designed to minimize system cost and ease implementation in embedded PSE endpoint (switches) or midspan (power injector) applications, the Si3460 operates directly from a 12 or 15 V input supply and integrates a digital PWM-based dc-dc converter for generating the -48 V PSE output supply. The IEEE-required Powered Device (PD) detection feature uses a robust 3-point algorithm to avoid false detection events. The Si3460's reference design kit also provides full IEEE-compliant classification and PD disconnect. Intelligent protection circuitry includes input undervoltage lockout (UVLO), classification-based current limiting, and output short-circuit protection. The Si3460 is designed to operate completely independently of host processor control. An LED status signal is provided to indicate the port status, including detect, power good, and output fault event information for use within the host system. The Si3460 is pin-programmable to support endpoint and midspan applications as well as each of the different classification power levels specified by the IEEE 802.3af standard.

Features
IEEE 802.3af™ compliant PSE and dc-dc controller
Autonomous operation requires no host processor interface
Complete reference design available, including S13460 controller, PSE firmware, and schematic
Low-cost BOM with compact PCB footprint
Operates directly from a 12 or 15 V isolated supply
DC-DC controller generates -48 V PSE output for SELV compatibility with telephony interfaces
Supports up to 15.4 W maximum output power (Class 0)
Robust 3-point detection algorithm eliminates false detection events
IEEE-compliant classification
IEEE-compliant disconnect
Inrush current control
Short-circuit output fault protection
LED status signal (detect, power good, output fault)
UNH Interoperability Test Lab test report available
Extended operating range (-40 to 85 °C)
11-Pin Quad Flat No-Lead (QFN)
Tiny 3 x 3 mm PCB footprint; Pb-free, RoHS-compliant

Applications
IEEE 802.3af endpoints and midspans
Environment A and B PSES
Embedded PSES
Set-top boxes