SI3461-E01-GM Datasheet SI3461-E01-GM, SI3461-KIT, SI3461-E01-GMR | P1-P3

Si3461

SINGLE-PORT IEEE 802.3AT POE/POE+ PSE INTERFACE

Features

Applications

Description

The Si3461 is a single-port power management controller for IEEE

802.3at-compliant Power Sourcing Equipment (PSE). The Si3461 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 Si3461's

reference design kit also provides full IEEE-compliant classification

and PD disconnect. Intelligent protection circuitry includes input under-

voltage lockout (UVLO), classification-based current limiting, and

output short-circuit protection. The Si3461 is designed to operate

completely 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 Si3461 is pin-

programmable to support four available power levels, endpoint and

mid-span applications, and auto-retry or restart after disconnect

functions. A comprehensive reference design kit is available (Si3461-

EVB), including a complete schematic and bill of materials.

 IEEE 802.3at

compliant PSE

 Autonomous operation requires

no host processor interface

 Complete reference design

available, including Si3461

controller and schematic:

Low-cost BOM

Compact PCB footprint

Operates directly from a +50 V

isolated supply

Supports up to 30 W maximum

output power (Class 4)

Robust 3-point detection algorithm

eliminates false detection events

IEEE-compliant disconnect

Inrush current control

Short-circuit output fault

protection

LED status signal (detect,

power good, output fault)

 UNH Interoperability Test Lab

report available

 Extended operating range

(–40 to +85 °C)

 11-Pin Quad Flat No-Lead

(QFN) package

Tiny 3x3 mm PCB footprint;

RoHS-compliant

 IEEE 802.3at endpoints and

midspans

 Environment A and B PSEs

 Embedded PSEs

 Set-top boxes

 FTTH media converters

 Cable modem and DSL

gateways

Pin Assignments

11-pin QFN (3x3 mm)

Top View—Pads on bottom of package

ISENSE

STATUS

VSENSE

RST

DETA

DC1

CLSMARK

DC2

VDD

CLSMODE

GND

Si3461

2 Rev. 1.0

Si3461

Rev. 1.0 3

TABLE OF CONTENTS

Section Page

1. Typical Application Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4

2. Si3461 Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5

2.1. Si3461-EVB Performance Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7

2.2. PSE Timing Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9

3. Typical Si3461-EVB Waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10

4. Si3461-EVB Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11

4.1. Reset State . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12

4.2. Operating Mode Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12

5. Operating Mode Sequencing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13

5.1. Detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13

5.2. Classification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13

5.3. Power-Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13

5.4. Overload Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14

5.5. Disconnect . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14

5.6. UVLO and OVLO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14

5.7. Status LED Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14

6. Design Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15

6.1. Isolation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15

6.2. External Component Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15

6.3. Input DC Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15

7. Si3461 Pin Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16

8. Ordering Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18

9. Package Outline: 11-Pin QFN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19

9.1. Solder Paste Mask . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20

9.2. PCB Landing Pattern . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21

9.3. Marking Specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22

Document Change List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23

Contact Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24

P1-P3 P4-P6 P7-P9 P10-P12 P13-P15 P16-P18 P19-P21 P22-P24

SI3461-E01-GM

Mfr. #:

Buy SI3461-E01-GM

Manufacturer:

Silicon Labs

Description:

Power Switch ICs - POE / LAN Single-port PoE / PoE+ PSE interface

Lifecycle:

New from this manufacturer.

Delivery:

DHL FedEx Ups TNT EMS

Payment:

T/T Paypal Visa MoneyGram Western Union

SI3461-E01-GM

SI3461-E01-GM

Products related to this Datasheet