Datasheet > SI3401

SI3401

更新时间： 2024-11-21 03:43:27

品牌	Logo	应用领域
芯科 - SILICON		稳压器开关光电二极管
页数	文件大小	规格书
20页	449K
描述
FULLY-INTEGRATED 802.3-COMPLIANT PD INTERFACE AND SWITCHING REGULATOR

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SI3401 数据手册

Si3400

Si3401

FULLY-INTEGRATED 802.3-COMPLIANT PD INTERFACE

AND SWITCHING REGULATOR

Features

ꢀ

IEEE 802.3 standard-compliant ꢀ Support non-isolated and

solution, including pre-standard

(legacy) PoE support

isolated switching topologies

Comprehensive protection

circuitry

ꢁ Transient overvoltage

protection

ꢁ Undervoltage lockout

ꢁ Early power-loss indicator

ꢁ Thermal shutdown protection

ꢁ Foldback current limiting

Programmable classification

circuit

ꢀ

Highly-integrated IC enables

compact solution footprints

ꢁ Minimal external components

ꢁ Integrated diode bridges and

transient surge suppressor

ꢁ Integrated switching regulator

controller with on-chip power

FET

Ordering Information:

See Ordering Guide on page

page 17.

ꢀ

ꢁ Integrated dual current-limited

hotswap switch

ꢀ

Low-profile 5 x 5 mm 20-pin QFN

Pb-Free and RoHS-compliant

Pin Assignments

5 x 5 mm QFN

(Top View)

Applications

ꢀ

Voice over IP telephones and ꢀ Point-of-sale terminals

adapters

Wireless access points

Security cameras

ꢀ

Internet appliances

Network devices

High power applications (Si3401)

ꢀ

EROUT

SSFT

CT1

VNEG

(PAD)

CT2

Description

VDD

VPOSF

SP1

ISOSSFT²

The Si3400 and Si3401 integrate all power management and control

functions required in a Power-over-Ethernet (PoE) powered device (PD)

application. The Si3400 and Si3401 convert the high voltage supplied over

the 10/100/1000BASE-T Ethernet connection into a regulated, low-voltage

output supply. The optimized architectures of the Si3400 and Si3401

minimize the solution footprint, reduce external BOM cost, and enable the

use of low-cost external components while maintaining high performance.

The Si3400 and Si3401 integrate the required diode bridges and transient

surge suppressors, thus enabling direct connection of ICs to the Ethernet

RJ-45 connector. The switching power FET and all associated functions are

also integrated. The integrated switching regulator supports isolated

(flyback) and non-isolated (buck) converter topologies. The Si3400 and

Si3401 support IEEE STD™ 802.3-2005 (future instances are referred to as

802.3) compliant solutions as well as pre-standard products, all in a single

IC. Standard external resistors connected to the Si3400 and Si3401 provide

the proper 802.3 signatures for the detection function and programming of

the classification mode. Startup circuits ensure well-controlled initial

operation of both the hotswap switch and the voltage regulator. The Si3400

and Si3401 are available in low-profile, 20-pin, 5 x 5 mm QFN packages.

While the Si3400 is designed for applications up to 10 W, the Si3401 is

optimized for higher power applications (up to approximately 15 W). See

also “AN313: Using the Si3400/01 in High Power Applications” for more

information.

Notes:

1. Pin VSSA added on revisions CZ

and higher.

2. Pin ISOSSFT added on revisions

CZ and higher. Function available

on revision E silicon. For Rev CZ,

or to disable this feature on

Revision E, tie this pin to VDD.

Rev. 0.9 8/07

Si3400/Si3401

This information applies to a product under development. Its characteristics and specifications are subject to change without notice.

12 3 4 5 6 7...20

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与SI3401相关器件

型号	品牌	获取价格	描述	数据表
SI3401A	MCC	获取价格	Tape: 3K/Reel, 120K/Ctn.;
SI3401AHE3	MCC	获取价格	Tape: 3K/Reel, 120K/Ctn.;
SI3401A-TP	MCC	获取价格	Small Signal Field-Effect Transistor,
SI3401-E1-GM	SILICON	获取价格	Interface Circuit, 5 X 5 MM, ROHS COMPLIANT, MO-220VHHB-1, QFN-20
SI3401-TP-HF	MCC	获取价格	Small Signal Field-Effect Transistor,
SI3401-X-GM	SILICON	获取价格	FULLY-INTEGRATED 802.3-COMPLIANT PD INTERFACE AND SWITCHING REGULATOR
SI3401-X-GMR	SILICON	获取价格	Interface Circuit, 5 X 5 MM, ROHS COMPLIANT, MO-220VHHB-1, QFN-20
SI3402	MCC	获取价格	Tape: 3K/Reel, 120K/Ctn.;
SI3402-A-GMR	SILICON	获取价格	Switching Regulator, Current-mode, 0.68A, 350kHz Switching Freq-Max, 5 X 5 MM, ROHS COMPLI
Si3402B	SILICON	获取价格	ISOLATED EVALUATION BOARD FOR THE Si3402B

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