LTC4257 datasheet(4/20 Pages) LINER

Part #	LTC4257

Description	IEEE 802.3af PD Power over Ethernet Interface Controller

Download	20 Pages

Scroll/Zoom	100%

Manufacturer	LINER [Linear Technology]

Direct Link	http://www.linear.com

Logo

4 / 20 page

LTC4257

4

4257fb

Input Current vs Input Voltage

INPUT VOLTAGE (V)

0

1

2

3

–45

–55

4257 G04

–60

–40

–50

EXCLUDES ANY LOAD CURRENT

TA = 25°C

Normalized UVLO Threshold

vs Temperature

TYPICAL PERFOR A CE CHARACTERISTICS

VOUT Leakage Current

Input Current vs Input Voltage

INPUT VOLTAGE (V)

0

10

20

30

40

50

–10

–20

–30

–40

4257 G01

–50

–60

CLASS 4

CLASS 3

CLASS 2

CLASS 1

CLASS 0

TA = 25°C

INPUT VOLTAGE (V)

0

0.1

0.2

0.3

0.4

0.5

–2

–4

–6

–8

4357 G02

–10

TA = 25°C

INPUT VOLTAGE (V)

–12

9.0

9.5

10.5

11.0

11.5

–14

–16

4257 G03

10.0

–18

–20

–22

12.0

85

°C

–40

°C

CLASS 1 OPERATION

Input Current vs Input Voltage

25k Detection Range

Input Current vs Input Voltage

INPUT VOLTAGE (V)

–1

22

V1:

V2:

23

25

26

27

–3

–5

4257 G05

24

–7

–9

–6

–10

–2

–4

–8

28

RESISTANCE =

DIODES: S1B

TA = 25°C

=

∆V

∆I

V2 – V1

I2 – I1

IEEE UPPER LIMIT

IEEE LOWER LIMIT

LTC4257 + 2 DIODES

LTC4257 ONLY

Signature Resistance

vs Input Voltage

TEMPERATURE (

°C)

–40

–2

–1

0

1

2

–20

0

20

40

4257 G06

60

80

APPLICABLE TO TURN-ON

AND TURN-0FF THRESHOLDS

Power Good Output Low Voltage

vs Current

CURRENT (mA)

0

2

3

8

4257 G07

1

0

2

4

6

10

4

TA = 25°C

VOUT PIN VOLTAGE (V)

0

30

60

120

90

20

40

42571 G09

60

VIN = 0V

TA = 25°C

Current Limit vs Input Voltage

INPUT VOLTAGE (V)

–40

345

355

–60

4257 G09

335

325

–45

–50

–55

375

365

VOUT = VIN + 5V

85

°C

25

°C

–40

°C

Similar Part No. - LTC4257

Manufacturer	Part #	Datasheet	Description
Linear Technology	LTC4257	671Kb / 28P	Single PoE PSE Controller High Capacitance Legacy Device Detection
	LTC4257	337Kb / 24P	Single IEEE 802.3af Compliant PSE Controller with Internal Switch
	LTC4257	1Mb / 32P	Power over Ethernet IEEE 802.3af PD Interface with Integrated Switching Regulator
	LTC4257-1	1Mb / 32P	Power over Ethernet IEEE 802.3af PD Interface with Integrated Switching Regulator
Analog Devices	LTC4257-1	1Mb / 40P	4-Port IEEE 802.3bt PoE PSE Controller

More results

Similar Description - LTC4257

Manufacturer	Part #	Datasheet	Description
Linear Technology	LTC4257	269Kb / 20P	IEEE 802.3af PD Power over Ethernet Interface Controller
Maxim Integrated Produc...	MAX5940	248Kb / 15P	IEEE 802.3af PD Interface Controller For Power-Over-Ethernet 19-2991; Rev 2; 2/06
	MAX5940	248Kb / 15P	IEEE 802.3af PD Interface Controller For Power-Over-Ethernet Rev 2; 2/06
	MAX5940A	295Kb / 15P	IEEE 802.3af PD Interface Controller For Power-Over-Ethernet Rev 0; 10/03
Linear Technology	LTC4267CDHC-3	1Mb / 32P	Power over Ethernet IEEE 802.3af PD Interface with Integrated Switching Regulator
	LTC4267	1Mb / 32P	Power over Ethernet IEEE 802.3af PD Interface with Integrated Switching Regulator
	LTC4267-1	903Kb / 32P	Power over Ethernet IEEE 802.3af PD Interface with Integrated Switching Regulator
Linear Integrated Syste...	LTC4267IGN-3	1Mb / 32P	Power over Ethernet IEEE 802.3af PD Interface with Integrated Switching Regulator
Linear Technology	LTC4267-3	715Kb / 32P	Power over Ethernet IEEE 802.3af PD Interface with Integrated Switching Regulator
Microsemi Corporation	PD70101	831Kb / 20P	Power Over Ethernet 802.3af/at PD Controller Rev.2.0, 17-Jan-2017

More results

LTC4257 Datasheet(PDF) 4 Page - Linear Technology

LTC4257 Datasheet(HTML) 4 Page - Linear Technology

Similar Part No. - LTC4257

Similar Description - LTC4257

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20

Datasheet Download

Link URL