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SI3460 Dataheets PDF



Part Number SI3460
Manufacturers Silicon Laboratories
Logo Silicon Laboratories
Description IEEE 802.3af PSE INTERFACE AND DC-DC CONTROLLER
Datasheet SI3460 DatasheetSI3460 Datasheet (PDF)

www.DataSheet.co.kr Si3460 IEEE 802.3af PSE INTERFACE Features IEEE 802.3af™ compliant PSE and dc-dc controller Autonomous operation requires no host processor interface Complete reference design available, including Si3460 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 (Cla.

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www.DataSheet.co.kr Si3460 IEEE 802.3af PSE INTERFACE Features IEEE 802.3af™ compliant PSE and dc-dc controller Autonomous operation requires no host processor interface Complete reference design available, including Si3460 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 AND DC-DC CONTROLLER Pin Assignments Si3460 11 11 GATE CTRL1 VDD CTRL2 250KHZ 1 2 3 4 5 11 11 10 9 STATUS ISENSE RST VSENSE DETA GND 8 7 6 11-pin QFN (3x3 mm) Top View—Pads on bottom of package Applications IEEE 802.3af endpoints and midspans Environment A and B PSEs Embedded PSEs Set-top boxes FTTH media converters Cable modem and DSL gateways 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 of 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), 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. A comprehensive reference design kit is available (Si3460-EVB), including a complete schematic and BOM (Bill-of-Materials) for the dcdc converter and PSE functions. Preliminary Rev. 0.4 11/07 Copyright © 2007 by Silicon Laboratories Si3460 This information applies to a product under development. Its characteristics and specifications are subject to change without notice. Datasheet pdf - http://www.DataSheet4U.net/ www.DataSheet.co.kr Si3460 1. Block Diagram OTP Memory Osc. PWM DC/DC Controller: UVLO, Current Limiting, Short Circuit Protection GATE 250KHZ VSENSE ISENSE State Machine Control RST STATUS Config. & LED I/F PSE Controller: Detection Classification Disconnect CTRL1 CTRL2 DETA Figure 1. Si3460 Block Diagram 2 Preliminary Rev. 0.4 Datasheet pdf - http://www.DataSheet4U.net/ www.DataSheet.co.kr Si3460 TA B L E O F C O N T E N TS Section Page 1. Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2 2. Si3460-EVB Application Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4 2.1. Si3460-EVB Performance Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4 3. Si3460 Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6 4. Si3460-EVB Performance Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8 4.1. PSE Timing Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9 4.2. DC-DC Converter Performance Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . .10 5. Si3460-EVB Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 5.1. Reset State . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11 5.2. Operating Mode Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 5.3. Operating Mode Sequencing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 6. Design Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14 6.1. Isolation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 6.2. External Component Selection . ..


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