Datasheet > LT3803

LT3803

更新时间： 2024-01-17 10:04:17

品牌	Logo	应用领域
凌特 - Linear		控制器以太网
页数	文件大小	规格书
30页	368K
描述
Quad IEEE 802.3at Power over Ethernet Controller

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中文翻译

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数据手册

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LT3803 数据手册

LTC4266

Quad IEEE 802.3at Power

over Ethernet Controller

FEATURES

DESCRIPTION

Four Independent PSE Channels

The LTC^®4266 is a quad PSE controller designed for use

in IEEE 802.3 Type 1 and Type 2 (high power) compliant

Power over Ethernet systems. External power MOSFETs

enhance system reliability and minimize channel resis-

tance, cutting power dissipation and eliminating the need

for heatsinks even at Type 2 power levels. External power

componentsalsoallowuseatveryhighpowerlevelswhile

remaining otherwise compatible with the IEEE standard.

80V-rated port pins provide robust protection against

external faults.

Compliant with IEEE 802.3at Type 1 and 2

0.34Ω Total Channel Resistance

130mW/Port at 600mA

Advanced Power Management

8-Bit Programmable Current Limit (I

)

LIM

7-Bit Programmable Overload Currents (I

Fast Shutdown of Preselected Ports

14.5-Bit Port Current/Voltage Monitoring

2-Event Classification

)

CUT

Very High Reliability 4-Point PD Detection:

2-Point Forced Voltage

The LTC4266 includes advanced power management

features, including current and voltage readback and pro-

2-Point Forced Current

grammable I

and I thresholds. Available C libraries

CUT

LIM

High Capacitance Legacy Device Detection

simplify power-management software development; an

optional AUTO pin mode provides fully IEEE-compliant

standaloneoperationwithnosoftwarerequired.Proprietary

4-point PD detection circuitry minimizes false PD detec-

tion while supporting legacy phone operation. Midspan

operation is supported with built-in 2-event classification

and backoff timing. Host communication is via a 1MHz

LTC4259A-1 and LTC4258 Pin and SW Compatible

1MHz I C Compatible Serial Control Interface

Midspan Backoff Timer

Supports Proprietary Power Levels Above 25W

Available in 38-Pin 5mm × 7mm QFN and 36-Pin

SSOP Packages

I C serial interface.

APPLICATIONS

The LTC4266 is available in a 5mm × 7mm QFN package

that significantly reduces board space compared with

competing solutions. A legacy-compatible 36-pin SSOP

package is also available.

High Power PSE Switches/Routers

High Power PSE Midspans

L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and

ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the property

of their respective owners.

TYPICAL APPLICATION

Complete 4-Port Ethernet High Power Source

3.3V

0.1µF

SCL

INT SHDN1 SHDN2 SHDN3 SHDN4

AUTO MSD RESET MID

SDAIN

SDAOUT

AD0

0.22µF 100V

S1B

×4

S1B

×4

LTC4266

×4

AD1

–50V

AD2

AD3

DGND AGND V SENSE1 GATE1 OUT1 SENSE2 GATE2 OUT2 SENSE3 GATE3 OUT3 SENSE4 GATE4 OUT4

PORT1

PORT2

PORT3

–50V

SMAJ58A

1µF

PORT4

4266 TA01

4266fb

12 3 4 5 6 7...30

中文翻译

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与LT3803相关器件

型号	品牌	获取价格	描述	数据表
LT3804	Linear	获取价格	Secondary Side Dual Output Controller with Opto Driver
LT3804EFE	Linear	获取价格	Secondary Side Dual Output Controller with Opto Driver
LT3804EFE#TR	Linear	获取价格	LT3804 - Secondary Side Dual Output Controller with Opto Driver; Package: TSSOP; Pins: 28;
LT3804EFE#TRPBF	Linear	获取价格	LT3804 - Secondary Side Dual Output Controller with Opto Driver; Package: TSSOP; Pins: 28;
LT380Z	SEOUL	获取价格	GREEN OVAL LAMP LED
LT381	SEOUL	获取价格	INFRARED LAMP LED
LT3825	Linear	获取价格	Isolated No-Opto Synchronous Flyback Controller with Wide Input Supply Range
LT3825	ADI	获取价格	具宽输入电源范围的隔离型无光隔离器同步反激式控制器
LT3825EFE	Linear	获取价格	Isolated No-Opto Synchronous Flyback Controller with Wide Input Supply Range
LT3825EFE#PBF	Linear	获取价格	LT3825 - Isolated No-Opto Synchronous Flyback Controller with Wide Input Supply Range; Pac

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