LTC4291-1/LTC4292

40

Rev 0

For more information www.analog.com

D17158-0-10/18(0)

www.analog.com



ANALOG DEVICES, INC. 2018

RELATED PARTS

PART NUMBER DESCRIPTION

COMMENTS

LT4294

LTPoE++/PoE+/PoE PD Controller

External Switch, IEEE 802.3bt Support Configurable Class

LT4295

IEEE 802.3bt PD with Forward/Flyback

Switching Regulator Controller

External Switch, IEEE 802.3bt Support, Configurable Class, Forward or No-Opto Flyback

Operation, Frequency, PG/SG Delays, Soft-Start, and Aux Support as Low as 9V, Including

Housekeeping Buck, Slope Compensation

LTC4257-1

IEEE 802.3af PD Interface Controller

Internal 100V, 400mA Switch, Dual Current Limit, Programmable Class

LTC4263

Single IEEE 802.3af PSE Controller

Internal FET Switch

LTC4265

IEEE 802.3at PD Interface Controller

Internal 100V, 1A Switch, 2-Event Classification Recognition

LTC4266

Quad IEEE 802.3at PoE PSE Controller

LTC4267

IEEE 802.3af PD Interface with Integrated

Switching Regulator

Internal 100V, 400mA Switch, Dual Inrush Current, Programmable Class

LTC4269-1

IEEE 802.3at PD Interface with Integrated

Flyback Switching Regulator

2-Event Classification, Programmable Class, Synchronous No-Opto Flyback Controller,

50kHz to 250kHz, Aux Support

LTC4269-2

IEEE 802.3at PD Interface with Integrated

Forward Switching Regulator

2-Event Classification, Programmable Class, Synchronous Forward Controller, 100kHz to

500kHz, Aux Support

LTC4270/

LTC4271

LTC4278

IEEE 802.3at PD Interface with Integrated

Flyback Switching Regulator

2-Event Classification, Programmable Class, Synchronous No-Opto Flyback Controller,

50kHz to 250kHz, 12V Aux Support

LTC4279

Single PoE/PoE+/LTPoE++ PSE Controller

Supports IEEE 802.3af, IEEE 802.3at, LTPoE++ and Proprietary PDs

LTC4290/

LTC4271

8-Port PoE/PoE+/LTPoE++ PSE Controller

Transformer Isolation, Supports IEEE 802.3af, IEEE 802.3at and LTPoE++ PDs

TYPICAL APPLICATION

VSSKn

VSSKn

100

100

100

100

100

100

100

100

S1B

10

0.15

>47µF

0.22µF

100V

S1B

S1B

0.15

0.22µF

100V

S1B

2nF

0.1µF

1µF

100V

0.22µF

1µF

3.3V

3.3V

CPA

CNA

DPA

DNA

VSSKn

SENSEnA

GATEnA

AGNDP

LTC4292

1000BASE-T

OUTnA

AGNDP

SENSEnB

GATEnB

OUTnB

AGNDP

TX1

TX2

TX3

TX4

RJ45

1

2

6

4

3

5

7

8

PWRMD0

PWRMD1

MSD

SCL

SDAIN

AD0

DGND

DPD

CND

LTC4291-1

CPD

DND

GP0

GP1

ISOLATION

AD1

AD2

AD3

SDAOUT

4PVALID

RESET

INT

AUTO

CAP1

3.3V

ISOLATION

REQUIRED)

AGNDP

(1 OF 4 PORTS)

D1

D2

QnA, QnB: PSMN040-100MSE

D1: SMCJ58A

D2: SMAJ58A

CAP2

2kV

QnA

QnB

VSSKn

AGNDP

0.22F, 100V

0.15Ω

42911 F34

Figure 34. IEEE 802.3bt Type 3 or Type 4 PSE, Alternative A (MDI-X) and Alternative B(S), 1000BASE-T, 1 of 4 Ports Shown