LTC4266IGW View Datasheet(PDF) - Linear Technology

Part Name

Description

Manufacturer

LTC4266IGW

Quad IEEE 802.3at Power over Ethernet Controller

Linear Technology 

TYPICAL PERFORMANCE CHARACTERISTICS

LTC4266

Power On Sequence

in AUTO Pin Mode

10

FORCED CURRENT DETECTION

0

GND

–10

–20

FORCED VOLTAGE

DETECTION

–30

PORT 1

802.3af

–40 VDD = 3.3V

VEE = –54V

–50

CLASSIFICATION

POWER ON

–60 VEE

–70

100ms/DIV

Powering Up into a 180µF Load

GND

802.3af Classification

in AUTO Pin Mode

GND

PORT

VOLTAGE

VDD = 3.3V

VEE = –54V

20V/DIV

VEE

LOAD

FULLY

CHARGED

–18.4

PORT

CURRENT

200 mA/DIV

0mA

GATE

VOLTAGE

10V/DIV VEE

FOLDBACK

425mA

CURRENT LIMIT

FET ON

PORT

VOLTAGE

10V/DIV

PORT 1

VDD = 3.3V

VEE = –55V

PD IS CLASS 1

VEE

5ms/DIV

5ms/DIV

4266 G01

4266 G02

4266 G03

2-Event Classification

in Auto Pin Mode

GND

–17.6

PORT

VOLTAGE

10V/DIV

1ST CLASS EVENT

2ND CLASS EVENT

PORT 1

VDD = 3.3V

VEE = –55V

PD IS CLASS 4

VEE

Classification Transient Response

to 40mA Load Step

PORT 40mA

CURRENT

20mA/DIV

VDD = 3.3V

VEE = –54V

0mA

PORT

VOLTAGE

1V/DIV

–20V

10ms/DIV

50µs/DIV

4266 G04

4266 G05

Classification Current Compliance

0

VDD = 3.3V

–2 VEE = –54V

–4 TA = 25°C

–6

–8

–10

–12

–14

–16

–18

–20

0

10 20 30 40 50 60 70

CLASSIFICATION CURRENT

4266 G06

VDD Supply Current vs Voltage

1.8

–40°C

1.7

25°C

1.6

85°C

1.5

1.4

1.3

1.2

1.1

1.0

0.9

0.8

2.7 2.9 3.1 3.3 3.5 3.7 3.9 4.1 4.3

VDD SUPPLY VOLTAGE (V)

4266 G07

VEE Supply Current vs Voltage

2.4

2.3

2.2

2.1

–40°C

25°C

85°C

2.0

–60 –55 –50 –45 –40 –35 –30 –25 –20

VEE SUPPLY VOLTAGE (V)

4266 G08

802.3at ILIM Threshold vs

Temperature

215

860

VDD = 3.3V

VEE = –54V

214

RSENSE = 0.25Ω

REG 48h = C0h

856

213

852

212

848

211

844

210

–40

0

40

–80

TEMPERATURE (°C)

840

120

4266 G09

4266fb

7

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