LTC4257

更新时间： 2024-11-27 22:51:47

品牌	Logo	应用领域
凌特 - Linear		稳压器开关光电二极管以太网
页数	文件大小	规格书
32页	1975K
描述
Power over Ethernet IEEE 802.3af PD Interface with Integrated Switching Regulator

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中文翻译

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LTC4257 数据手册

LTC4267

Power over Ethernet

IEEE 802.3af PD Interface with

Integrated Switching Regulator

FEATURES

DESCRIPTIO

Complete Power Interface Port for IEEE 802^®.3af

The LTC^®4267 combines an IEEE 802.3af compliant Pow-

ered Device (PD) interface with a current mode switching

regulator, providing a complete power solution for PD

applications. The LTC4267 integrates the 25kΩ signature

resistor,classiﬁcationcurrentsource,thermaloverloadpro-

tection,signaturedisableandpowergoodsignalalongwith

an undervoltage lockout optimized for use with the IEEE-

requireddiodebridge.Theprecisionduallevelinputcurrent

limit allows the LTC4267 to charge large load capacitors

and interface with legacy PoE systems.

■

Powered Device (PD)

■

Onboard 100V, 400mA UVLO Switch

■

Precision Dual Level Inrush Current Limit

■

Integrated Current Mode Switching Regulator

■

Onboard 25kΩ Signature Resistor with Disable

■

Programmable Classiﬁcation Current (Class 0-4)

■

Thermal Overload Protection

Power Good Signal

■

Integrated Error Ampliﬁer and Voltage Reference

■

Low Proﬁle 16-Pin SSOP and 3mm × 5mm DFN

The current mode switching regulator is designed for

driving a 6V rated N-channel MOSFET and features pro-

grammable slope compensation, soft-start, and constant

frequency operation, minimizing noise even with light

loads. The LTC4267 includes an onboard error ampliﬁer

and voltage reference allowing use in both isolated and

nonisolated conﬁgurations.

Packages

APPLICATIO S

■

IP Phone Power Management

■

Wireless Access Points

■

Security Cameras

Power over Ethernet

■

The LTC4267 is available in space saving, low proﬁle

16-pin SSOP or DFN packages.

, LTC and LT are registered trademarks of Linear Technology Corporation.

All other trademarks are the property of their respective owners.

802 is a registered trademark of Institute of Electrical and Electronics Engineers, Inc.

TYPICAL APPLICATIO

Class 2 PD with 3.3V Isolated Power Supply

PA1133 SBM1040

3.3V

1.5A

10k

–48V

•

HD01

FROM

PORTP

VCC

320µF

CHASSIS

DATA PAIR

5µF

VCC

–

•

MIN

4.7µF

PWRGD

LTC4267

SMAJ58A

NGATE

SENSE

/RUN

Si3440

10k

0.1µF

0.1Ω

VCC

6.8k

CLASS

470

HD01

–48V

FROM

SPARE PAIR

CLASS

68.1Ω

–

100k

SIGDISA

22nF

PGND

BA5516

OUT

PORTN

PS2911

60.4k

TLV431

4267 TA01

4267f

12 3 4 5 6 7...32

中文翻译

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与LTC4257相关器件

型号	品牌	获取价格	描述	数据表
LTC4257-1	Linear	获取价格	Power over Ethernet Interface Controller with Dual Current Limit
LTC4257-1	ADI	获取价格	具有双电流限值的IEEE 802.3af PD 以太网供电接口控制器
LTC4257CDD	Linear	获取价格	IEEE 802.3af PD Power over Ethernet Interface Controller
LTC4257CDD#PBF	Linear	获取价格	LTC4257 - IEEE 802.3af PD Power over Ethernet Interface Controller; Package: DFN; Pins: 8;
LTC4257CDD-1	Linear	获取价格	Power over Ethernet Interface Controller with Dual Current Limit
LTC4257CDD-1#TRPBF	Linear	获取价格	LTC4257-1 - IEEE 802.3af PD Power over Ethernet Interface Controller with Dual Current Lim
LTC4257CS8	Linear	获取价格	IEEE 802.3af PD Power over Ethernet Interface Controller
LTC4257CS8#TRPBF	Linear	获取价格	LTC4257 - IEEE 802.3af PD Power over Ethernet Interface Controller; Package: SO; Pins: 8;
LTC4257CS8-1	Linear	获取价格	Power over Ethernet Interface Controller with Dual Current Limit
LTC4257CS8-1#TR	Linear	获取价格	LTC4257-1 - IEEE 802.3af PD Power over Ethernet Interface Controller with Dual Current Lim

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